Finished AB5

angabe/Aufgabenblatt5.md

@@ -19,7 +19,7 @@ Ziel der Aufgabe ist die Anwendung der Konzepte: Gleichheit und Hash-Werte, Hash
 - [Massive](../src/Massive.java) ist ein Interface, das Himmelskörper (als kohärente Massen)
 beschreibt. `Massive` ist der gemeinsame Obertyp für verschiedene Klassen von Himmelkörpern. Die
 meisten spezifizierten Methoden sind mit einer `default`-Implementierung definiert. Dieser
-Programcode wird ausgeführt, falls die entsprechende Klasse (`Body` oder `NamedBody`) über keine
+Programmcode wird ausgeführt, falls die entsprechende Klasse (`Body` oder `NamedBody`) über keine
 eigene Definition der Methode verfügt. Verändern Sie diese Datei bitte nicht.
 - [NamedBody](../src/NamedBody.java) ist das Gerüst einer Klassendefinition. Die Klasse
 repräsentiert Himmelskörper, die einen Namen haben.
@@ -100,8 +100,3 @@ Ihre Aufgaben sind folgende:
 - Implementierung von `Simulation5`: 1 Punkte
  
 - Gesamt: 5 Punkte
-
-
-
-
-

src/Aufgabe5Test.java

@@ -1,125 +1,81 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
 public class Aufgabe5Test {
 
-    public static void main(String[] args) {
-
-        /* //TODO: uncomment for testing
-
+    @Test
+    public void testEP2() {
         //test classes NamedBody and MassiveForceHashMap
 
         // create 12 named bodies
-        NamedBody sun1, mercury1, venus1, earth1, moon1, mars1, deimos1, phobos1, vesta1,
-                pallas1, hygiea1, ceres1;
+        NamedBody sun1, mercury1, venus1, earth1, moon1, mars1, deimos1, phobos1, vesta1, pallas1, hygiea1, ceres1;
 
         // create a nameless body
-        Body earth2 = new Body(5.972E24, new Vector3(-6.13135922534815E10,-1.383789852227691E11,
-           2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
-
+        Body earth2 = new Body(SolSystem4.EARTH);
 
         // create the same 12 named body-force pairs
-        sun1 = new NamedBody("Sun",1.989E30, new Vector3(0.0,0.0,0.0)
-                , new Vector3(0.0,0.0,0.0));
-        earth1 = new NamedBody("Earth",5.972E24,
-                new Vector3(-6.13135922534815E10,-1.383789852227691E11,2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
-        moon1 = new NamedBody("Moon",7.349E22,
-                new Vector3(-6.132484773775896E10,-1.387394951280871E11,1.701046736294776E7), new Vector3(27916.62329282941,-12020.39526008238,-94.89703264508708));
-        mars1 = new NamedBody("Mars",6.41712E23,
-                new Vector3(-1.7923193702925848E11,1.726665823982123E11,7.991673845249474E9), new Vector3(-15925.78496403673,-15381.16179928219,68.67560910598857));
-        deimos1 = new NamedBody("Deimos",1.8E20,
-                new Vector3(-1.792255010450533E11,1.726891122683271E11,7.990659337380297E9), new Vector3(-17100.476719804457,-15020.348656808,631.2927851249581));
-        phobos1 = new NamedBody("Phobos",1.08E20,
-                new Vector3(-1.792253482539647E11,1.72661109673625E11,7.987848354800322E9), new Vector3(-14738.203714241401,-13671.17675223948,-411.0012490555253));
-        mercury1 = new NamedBody("Mercury",3.301E23,
-                new Vector3(-5.167375560011926E10,-4.217574885682655E10,1.14808913958168E9), new Vector3(21580.25398577148,-34951.03632847389,-4835.225596525241));
-        venus1 = new NamedBody("Venus",4.86747E24,
-                new Vector3(-3.123150865740532E10,1.0395568504115701E11,3.173401325838074E9), new Vector3(-33748.180519629335,-10014.25141045021,1809.94488874165));
-        vesta1 = new NamedBody("Vesta",2.5908E20,
-                new Vector3(-3.337493557929893E11,-4.7147908276077385E10,4.1923010146878105E10), new Vector3(4440.54247538484,-19718.49074006637,48.06573124543601));
-        pallas1 = new NamedBody("Pallas",2.14E20,
-                new Vector3(4.3452066613895575E11,-2.057319365171432E11,1.0549957423213101E11), new Vector3(5058.947582097117,11184.45711782372,-8183.524138259704));
-        hygiea1 = new NamedBody("Hygiea",8.32E19,
-                new Vector3(-3.983943433707043E11,2.325833000024021E11,-2.233667695713672E10), new Vector3(-6931.864585548552,-15686.8108598699,-690.5791992347208));
-        ceres1 = new NamedBody("Ceres",9.394E20,
-                new Vector3(3.781372641419032E11,1.96718960466285E11,-6.366459168068592E10), new Vector3(-8555.324226752316,14718.33755980907,2040.230135060142));
+        sun1 = new NamedBody(SolSystem4.SUN_NAMED);
+        earth1 = new NamedBody(SolSystem4.EARTH_NAMED);
+        moon1 = new NamedBody(SolSystem4.MOON_NAMED);
+        mars1 = new NamedBody(SolSystem4.MARS_NAMED);
+        deimos1 = new NamedBody(SolSystem4.DEIMOS_NAMED);
+        phobos1 = new NamedBody(SolSystem4.PHOBOS_NAMED);
+        mercury1 = new NamedBody(SolSystem4.MERCURY_NAMED);
+        venus1 = new NamedBody(SolSystem4.VENUS_NAMED);
+        vesta1 = new NamedBody(SolSystem4.VESTA_NAMED);
+        pallas1 = new NamedBody(SolSystem4.PALLAS_NAMED);
+        hygiea1 = new NamedBody(SolSystem4.HYGIEA_NAMED);
+        ceres1 = new NamedBody(SolSystem4.CERES_NAMED);
 
-        System.out.println("Test1:");
-        NamedBody sun2 = new NamedBody("Sun",1.9895E30, new Vector3(0.1,0.0,0.0)
-                , new Vector3(0.0,0.0,0.0));
-        NamedBody earth3 = new NamedBody("Earth", 1, new Vector3(0,0,0), new Vector3(0,0,0));
-        testValue(sun1.equals(sun2), true);
-        testValue(sun1.hashCode(), sun2.hashCode());
-        testValue(earth1.equals(earth3), true);
-        testValue(earth1.hashCode(), earth3.hashCode());
+        NamedBody sun2 = new NamedBody("Sun", 1.9895E30, new Vector3(0.1, 0.0, 0.0), new Vector3(0.0, 0.0, 0.0));
+        NamedBody earth3 = new NamedBody("Earth", 1, new Vector3(0, 0, 0), new Vector3(0, 0, 0));
+        assertEquals(sun1, sun2);
+        assertEquals(sun2.hashCode(), sun1.hashCode());
+        assertEquals(earth1, earth3);
+        assertEquals(earth3.hashCode(), earth1.hashCode());
 
         // check basic functions of 'MassiveForceHashMap'
-        System.out.println("Test2:");
         MassiveForceHashMap map = new MassiveForceHashMap();
-        map.put(sun1, new Vector3(0,0,0));
-        map.put(mercury1, new Vector3(0,0,0));
-        map.put(venus1, new Vector3(0,0,0));
-        map.put(earth1, new Vector3(0,0,0));
-        map.put(moon1, new Vector3(0,0,0));
-        map.put(mars1, new Vector3(0,0,0));
-        map.put(deimos1, new Vector3(0,0,0));
-        map.put(phobos1, new Vector3(0,0,0));
-        map.put(vesta1, new Vector3(0,0,0));
-        map.put(pallas1, new Vector3(0,0,0));
-        map.put(hygiea1, new Vector3(0,0,0));
-        map.put(ceres1, new Vector3(0,0,0));
-        map.put(mars1, new Vector3(0,0,0)); // inserted twice
-        testValue(map.keyList().size(), 12);
+        map.put(sun1, new Vector3(0, 0, 0));
+        map.put(mercury1, new Vector3(0, 0, 0));
+        map.put(venus1, new Vector3(0, 0, 0));
+        map.put(earth1, new Vector3(0, 0, 0));
+        map.put(moon1, new Vector3(0, 0, 0));
+        map.put(mars1, new Vector3(0, 0, 0));
+        map.put(deimos1, new Vector3(0, 0, 0));
+        map.put(phobos1, new Vector3(0, 0, 0));
+        map.put(vesta1, new Vector3(0, 0, 0));
+        map.put(pallas1, new Vector3(0, 0, 0));
+        map.put(hygiea1, new Vector3(0, 0, 0));
+        map.put(ceres1, new Vector3(0, 0, 0));
+        map.put(mars1, new Vector3(0, 0, 0)); // inserted twice
+        assertEquals(12, map.keyList().size());
 
-        System.out.println("Test3:");
-        testValue(map.toString().contains("Mars"), true);
-        testValue(map.toString().contains("Deimos"), true);
-        testValue(map.toString().contains("Moon"), true);
-        testValue(map.toString().contains("Earth"), true);
+        assertTrue(map.toString().contains("Mars"));
+        assertTrue(map.toString().contains("Deimos"));
+        assertTrue(map.toString().contains("Moon"));
+        assertTrue(map.toString().contains("Earth"));
 
-        System.out.println("Test4:");
         MassiveLinkedList bl = map.keyList();
         boolean allThere = true;
         while (bl.size() > 0) {
             allThere &= map.containsKey(bl.pollFirst());
         }
-        testValue(allThere, true);
-        testValue(map.containsKey(new Body(0,new Vector3(0,0,0), new Vector3(0,0,0))),
-                false);
-        testValue(map.containsKey(new NamedBody("Omuamua",0,new Vector3(0,0,0), new Vector3(0,0,
-                        0))),
-                false);
+        assertTrue(allThere);
+        assertFalse(map.containsKey(new Body(0, new Vector3(0, 0, 0), new Vector3(0, 0, 0))));
+        assertFalse(map.containsKey(new NamedBody("Omuamua", 0, new Vector3(0, 0, 0), new Vector3(0, 0, 0))));
 
-        System.out.println("Test5:");
-        Vector3 f = new Vector3(5,5,5);
+        int hashCode1 = map.hashCode();
+
+        Vector3 f = new Vector3(5, 5, 5);
         map.put(earth3, f);
-        testValue(map.get(earth1), f);
-        testValue(map.get(earth2), null);
+        assertEquals(f, map.get(earth1));
+        assertNull(map.get(earth2));
 
-        */ //TODO: uncomment
+        int hashCode2 = map.hashCode();
+        assertEquals(map, map);
+        assertEquals(hashCode2, map.hashCode());
+        assertNotEquals(hashCode1, hashCode2);
     }
-
-    public static void testComparison(Object first, Object second, boolean expected) {
-        boolean real = first == second;
-
-        if (real == expected) {
-            System.out.println("Successful comparison");
-        } else {
-            System.out.println("Comparison NOT successful! Expected value: " + expected + " / Given value: " + real);
-        }
-    }
-
-    public static void testValue(Object given, Object expected) {
-        if (given == expected) {
-            System.out.println("Successful test");
-        } else {
-            System.out.println("Test NOT successful! Expected value: " + expected + " / Given value: " + given);
-        }
-    }
-
-    public static void testValue(double given, double expected) {
-        if (given < expected + (expected + 1) / 1e12 && given > expected - (expected + 1) / 1e12) {
-            System.out.println("Successful test");
-        } else {
-            System.out.println("Test NOT successful! Expected value: " + expected + " / Given value: " + given);
-        }
-    }
-
 }

src/Body.java

@@ -3,7 +3,7 @@ import codedraw.CodeDraw;
 /**
  * This class represents celestial bodies like stars, planets, asteroids, etc...
  */
-public class Body {
+public class Body implements Massive {
     private final double mass;
     private Vector3 massCenter; // position of the mass center.
     private Vector3 currentMovement;

src/BodyForceTreeMap.java

@@ -4,7 +4,7 @@
  */
 public class BodyForceTreeMap {
     private int size = 0;
-    private BodyForceTreeMapItem root = null;
+    private Item root = null;
 
     /**
      * Adds a new key-value association to this map. If the key already exists in this map,
@@ -13,30 +13,30 @@ public class BodyForceTreeMap {
      */
     public Vector3 put(Body key, Vector3 value) {
         if (root == null) {
-            root = new BodyForceTreeMapItem(key, value);
+            root = new Item(key, value);
             size++;
             return null;
         }
 
-        BodyForceTreeMapItem item = root;
+        Item item = root;
         while (item != null) {
-            if (item.key() == key) {
-                Vector3 old = item.value();
-                item.setValue(value);
+            if (item.key == key) {
+                Vector3 old = item.value;
+                item.value = value;
                 return old;
-            } else if (item.key().mass() > key.mass()) {
-                if (item.left() != null) {
-                    item = item.left();
+            } else if (item.key.mass() > key.mass()) {
+                if (item.left != null) {
+                    item = item.left;
                 } else {
-                    item.setLeft(new BodyForceTreeMapItem(key, value));
+                    item.setLeft(new Item(key, value));
                     size++;
                     break;
                 }
             } else {
-                if (item.right() != null) {
-                    item = item.right();
+                if (item.right != null) {
+                    item = item.right;
                 } else{
-                    item.setRight(new BodyForceTreeMapItem(key, value));
+                    item.setRight(new Item(key, value));
                     size++;
                     break;
                 }
@@ -52,14 +52,14 @@ public class BodyForceTreeMap {
      * Precondition: key != null.
      */
     public Vector3 get(Body key) {
-        BodyForceTreeMapItem item = root;
+        Item item = root;
         while (item != null) {
-            if (item.key() == key) {
-                return item.value();
-            } else if (item.key().mass() > key.mass()) {
-                item = item.left();
+            if (item.key == key) {
+                return item.value;
+            } else if (item.key.mass() > key.mass()) {
+                item = item.left;
             } else {
-                item = item.right();
+                item = item.right;
             }
         }
         return null;
@@ -69,14 +69,14 @@ public class BodyForceTreeMap {
      * Returns 'true' if this map contains a mapping for the specified key.
      */
     public boolean containsKey(Body key) {
-        BodyForceTreeMapItem item = root;
+        Item item = root;
         while (item != null) {
-            if (item.key() == key) {
+            if (item.key == key) {
                 return true;
-            } else if (item.key().mass() > key.mass()) {
-                item = item.left();
+            } else if (item.key.mass() > key.mass()) {
+                item = item.left;
             } else {
-                item = item.right();
+                item = item.right;
             }
         }
         return false;
@@ -86,14 +86,14 @@ public class BodyForceTreeMap {
         return this.size;
     }
 
-    private String toString(BodyForceTreeMapItem item) {
+    private String toString(Item item) {
         String s = "";
         if (item == null) {
             return s;
         }
-        s += this.toString(item.right());
-        s += String.format("{%s: %s}\n", item.key(), item.value());
-        s += this.toString(item.left());
+        s += this.toString(item.right);
+        s += String.format("{%s: %s}\n", item.key, item.value);
+        s += this.toString(item.left);
         return s;
     }
 
@@ -105,51 +105,27 @@ public class BodyForceTreeMap {
     public String toString() {
         return toString(root);
     }
-}
 
-class BodyForceTreeMapItem {
-    private final Body key;
-    private Vector3 value;
-    private BodyForceTreeMapItem parent;
-    private BodyForceTreeMapItem left;
-    private BodyForceTreeMapItem right;
+    private class Item {
+        private final Body key;
+        private Vector3 value;
+        private Item parent;
+        private Item left;
+        private Item right;
 
-    public BodyForceTreeMapItem(Body key, Vector3 value) {
-        this.key = key;
-        this.value = value;
-    }
+        public Item(Body key, Vector3 value) {
+            this.key = key;
+            this.value = value;
+        }
 
-    public Body key() {
-        return this.key;
-    }
+        public void setLeft(Item left) {
+            this.left = left;
+            if (left != null) left.parent = this;
+        }
 
-    public void setValue(Vector3 value) {
-        this.value = value;
-    }
-
-    public Vector3 value() {
-        return this.value;
-    }
-
-    public BodyForceTreeMapItem left() {
-        return this.left;
-    }
-
-    public BodyForceTreeMapItem right() {
-        return this.right;
-    }
-
-    public BodyForceTreeMapItem parent() {
-        return this.parent;
-    }
-
-    public void setLeft(BodyForceTreeMapItem left) {
-        this.left = left;
-        if (left != null) left.parent = this;
-    }
-
-    public void setRight(BodyForceTreeMapItem right) {
-        this.right = right;
-        if (right != null) right.parent = this;
+        public void setRight(Item right) {
+            this.right = right;
+            if (right != null) right.parent = this;
+        }
     }
 }

src/BodyLinkedList.java

@@ -6,8 +6,8 @@ import java.util.Iterator;
  */
 public class BodyLinkedList implements Iterable<Body> {
     private int size = 0;
-    private BodyLinkedListItem first;
-    private BodyLinkedListItem last;
+    private Item first;
+    private Item last;
 
     /**
      * Initializes 'this' as an empty list.
@@ -35,11 +35,11 @@ public class BodyLinkedList implements Iterable<Body> {
      */
     public void addFirst(Body body) {
         if (first == null) {
-            first = new BodyLinkedListItem(body);
+            first = new Item(body);
             last = first;
         } else {
-            first.setPrev(new BodyLinkedListItem(body));
-            first = first.prev();
+            first.setPrev(new Item(body));
+            first = first.prev;
         }
         size++;
     }
@@ -49,11 +49,11 @@ public class BodyLinkedList implements Iterable<Body> {
      */
     public void addLast(Body body) {
         if (last == null) {
-            last = new BodyLinkedListItem(body);
+            last = new Item(body);
             first = last;
         } else {
-            last.setNext(new BodyLinkedListItem(body));
-            last = last.next();
+            last.setNext(new Item(body));
+            last = last.next;
         }
         size++;
     }
@@ -63,7 +63,7 @@ public class BodyLinkedList implements Iterable<Body> {
      * Returns 'null' if the list is empty.
      */
     public Body getLast() {
-        return (last != null) ? last.body() : null;
+        return (last != null) ? last.body : null;
     }
 
     /**
@@ -71,7 +71,7 @@ public class BodyLinkedList implements Iterable<Body> {
      * Returns 'null' if the list is empty.
      */
     public Body getFirst() {
-        return (first != null) ? first.body() : null;
+        return (first != null) ? first.body : null;
     }
 
     /**
@@ -82,8 +82,8 @@ public class BodyLinkedList implements Iterable<Body> {
         if (first == null) {
             return null;
         }
-        Body b = first.body();
-        first = first.next();
+        Body b = first.body;
+        first = first.next;
         if (first != null) first.setPrev(null);
         size--;
         return b;
@@ -97,8 +97,8 @@ public class BodyLinkedList implements Iterable<Body> {
         if (last == null) {
             return null;
         }
-        Body b = last.body();
-        last = last.prev();
+        Body b = last.body;
+        last = last.prev;
         if (last != null) last.setNext(null);
         size--;
         return b;
@@ -117,28 +117,28 @@ public class BodyLinkedList implements Iterable<Body> {
             return;
         }
 
-        BodyLinkedListItem item = first;
+        Item item = first;
         for (int j = 0; j < i; j++) {
-            item = item.next();
+            item = item.next;
         }
 
-        item.prev().setNext(new BodyLinkedListItem(body));
-        item.setPrev(item.prev().next());
+        item.prev.setNext(new Item(body));
+        item.setPrev(item.prev.next);
         size++;
     }
 
-    private Body removeItem(BodyLinkedListItem item) {
+    private Body removeItem(Item item) {
         if (item == first) {
-            first = item.next();
+            first = item.next;
             if (first != null) first.setPrev(null);
         } else if (item == last) {
-            last = item.prev();
+            last = item.prev;
             if (last != null) last.setNext(null);
         } else {
-            item.next().setPrev(item.prev());
+            item.next.setPrev(item.prev);
         }
         size--;
-        return item.body();
+        return item.body;
     }
 
     /**
@@ -146,19 +146,19 @@ public class BodyLinkedList implements Iterable<Body> {
      * Precondition: i >= 0 && i < size().
      */
     public Body get(int i) {
-        BodyLinkedListItem item;
+        Item item;
         if (i < size / 2) {
             item = first;
             for (int j = 0; j < i; j++) {
-                item = item.next();
+                item = item.next;
             }
         } else {
             item = last;
             for (int j = size - 1; j > i; j--) {
-                item = item.prev();
+                item = item.prev;
             }
         }
-        return item.body();
+        return item.body;
     }
 
     /**
@@ -170,12 +170,9 @@ public class BodyLinkedList implements Iterable<Body> {
             return -1;
         }
 
-        BodyLinkedListItem item = first;
-        for (int i = 0; i < size; i++) {
-            if (item.body() == body) {
-                return i;
-            }
-            item = item.next();
+        Item item = first;
+        for (int i = 0; i < size; i++, item = item.next) {
+            if (item.body == body) return i;
         }
 
         return -1;
@@ -187,8 +184,8 @@ public class BodyLinkedList implements Iterable<Body> {
      */
     public BodyLinkedList removeCollidingWith(Body body) {
         BodyLinkedList removed = new BodyLinkedList();
-        for (BodyLinkedListItem item = first; item != null; item = item.next()) {
-            if (body != item.body() && body.collidesWith(item.body())) {
+        for (Item item = first; item != null; item = item.next) {
+            if (body != item.body && body.collidesWith(item.body)) {
                 removed.addLast(this.removeItem(item));
             }
         }
@@ -205,57 +202,45 @@ public class BodyLinkedList implements Iterable<Body> {
     @Override
     public Iterator<Body> iterator() {
         return new Iterator<>() {
-            BodyLinkedListItem ptr = first;
+            Item ptr = first;
             boolean yieldedFirst = false;
 
             @Override
             public boolean hasNext() {
-                return ptr != null && (!yieldedFirst || ptr.next() != null);
+                return ptr != null && (!yieldedFirst || ptr.next != null);
             }
 
             @Override
             public Body next() {
                 if (!yieldedFirst) {
                     yieldedFirst = true;
-                    return ptr.body();
+                } else {
+                    ptr = ptr.next;
                 }
-                ptr = ptr.next();
-                return ptr.body();
+                return ptr.body;
             }
         };
     }
-}
 
-class BodyLinkedListItem {
-    private final Body body;
-    private BodyLinkedListItem prev;
-    private BodyLinkedListItem next;
+    private class Item {
+        private final Body body;
+        private Item prev;
+        private Item next;
 
-    public BodyLinkedListItem(Body body) {
-        this.body = body;
-        this.prev = null;
-        this.next = null;
-    }
+        public Item(Body body) {
+            this.body = body;
+            this.prev = null;
+            this.next = null;
+        }
 
-    public Body body() {
-        return body;
-    }
+        public void setPrev(Item prev) {
+            this.prev = prev;
+            if (prev != null) prev.next = this;
+        }
 
-    public BodyLinkedListItem prev() {
-        return prev;
-    }
-
-    public void setPrev(BodyLinkedListItem prev) {
-        this.prev = prev;
-        if (prev != null) prev.next = this;
-    }
-
-    public BodyLinkedListItem next() {
-        return next;
-    }
-
-    public void setNext(BodyLinkedListItem next) {
-        this.next = next;
-        if (next != null) next.prev = this;
+        public void setNext(Item next) {
+            this.next = next;
+            if (next != null) next.prev = this;
+        }
     }
 }

src/Massive.java

@@ -1,64 +1,73 @@
-// Represents a coherent mass with a mass center in 3D space. Has two naming schemes for its
-// methods. Please, do not change this interface definition!
-//
+/**
+ * Represents a coherent mass with a mass center in 3D space. Has two naming schemes for its
+ * methods. Please, do not change this interface definition!
+ */
 public interface Massive extends Drawable {
 
-    // Returns the mass.
+    /**
+     * Returns the mass.
+     */
     default double mass() {
-
         return getMass();
     }
 
-    // Returns the mass center.
+    /**
+     * Returns the mass center.
+     */
     default Vector3 massCenter() {
-
         return getMassCenter();
     }
 
-    // Returns the mass.
+    /**
+     * Returns the mass.
+     */
     default double getMass() {
-
         return mass();
     }
 
-    // Returns the mass center.
+    /**
+     * Returns the mass center.
+     */
     default Vector3 getMassCenter() {
-
         return massCenter();
     }
 
-    // Returns the approximate radius of 'this', assuming it is a coherent round mass.
-    // (It is assumed that the radius r is related to the mass m by r = m ^ 0.5,
-    // where m and r measured in solar units.)
+    /**
+     * Returns the approximate radius of 'this', assuming it is a coherent round mass.
+     * (It is assumed that the radius r is related to the mass m by r = m ^ 0.5,
+     * where m and r measured in solar units.)
+     */
     default double getRadius() {
-
         return radius();
     }
 
-    // Returns the approximate radius of 'this', assuming it is a coherent round mass.
-    // (It is assumed that the radius r is related to the mass m by r = m ^ 0.5,
-    // where m and r measured in solar units.)
+    /**
+     * Returns the approximate radius of 'this', assuming it is a coherent round mass.
+     * (It is assumed that the radius r is related to the mass m by r = m ^ 0.5,
+     * where m and r measured in solar units.)
+     */
     default double radius() {
-
         return SpaceDraw.massToRadius(mass());
     }
 
-    // Returns a vector representing the gravitational force exerted by 'b' on this mass.
-    // The gravitational Force F is calculated by F = G*(m1*m2)/(r*r), with m1 and m2 being the
-    // masses of the objects interacting, r being the distance between the centers of the masses
-    // and G being the gravitational constant.
+    /**
+     * Returns a vector representing the gravitational force exerted by 'b' on this mass.
+     * The gravitational Force F is calculated by F = G*(m1*m2)/(r*r), with m1 and m2 being the
+     * masses of the objects interacting, r being the distance between the centers of the masses
+     * and G being the gravitational constant.
+     */
     default Vector3 gravitationalForce(Massive b) {
-
         Vector3 direction = b.massCenter().minus(this.massCenter());
         double distance = direction.length();
         direction.normalize();
-        double force = Simulation.G*this.mass()*b.mass()/(distance * distance);
+        double force = Simulation.G * this.mass() * b.mass() / (distance * distance);
         return direction.times(force);
     }
 
-    // Centers this mass at a new position, according to the specified force vector 'force' exerted
-    // on it, and updates the current velocity vector accordingly.
-    // (Velocity depends on the mass of 'this', its current velocity and the exerted force.)
+    /**
+     * Centers this mass at a new position, according to the specified force vector 'force' exerted
+     * on it, and updates the current velocity vector accordingly.
+     * (Velocity depends on the mass of 'this', its current velocity and the exerted force.)
+     */
     void move(Vector3 force);
-
 }

src/MassiveForceHashMap.java

@@ -1,72 +1,161 @@
-// A hash map that associates a 'Massive'-object with a Vector3 (typically this is the force
-// exerted on the object). The number of key-value pairs is not limited.
-//
+/**
+ * A hash map that associates a 'Massive'-object with a Vector3 (typically this is the force
+ * exerted on the object). The number of key-value pairs is not limited.
+ */
 public class MassiveForceHashMap {
+    private int size;
+    private Massive[] keys;
+    private Vector3[] values;
 
-    // TODO: define missing parts of this class.
-
-    // Initializes 'this' as an empty map.
+    /**
+     * Initializes 'this' as an empty map.
+     */
     public MassiveForceHashMap() {
-
-        // TODO: implement constructor.
+        this(16);
     }
 
-    // Adds a new key-value association to this map. If the key already exists in this map,
-    // the value is replaced and the old value is returned. Otherwise 'null' is returned.
-    // Precondition: key != null.
+    public MassiveForceHashMap(int capacity) {
+        this.size = 0;
+        this.keys = new Massive[capacity];
+        this.values = new Vector3[capacity];
+    }
+
+    /**
+     * Adds a new key-value association to this map. If the key already exists in this map,
+     * the value is replaced and the old value is returned. Otherwise 'null' is returned.
+     * Precondition: key != null.
+     */
     public Vector3 put(Massive key, Vector3 value) {
+        if (size > keys.length / 2) doubleCapacity();
 
-        // TODO: implement method.
-        return null;
+        int idx = ((key.hashCode() % keys.length) + keys.length) % keys.length;
+        for (int i = 0; i < keys.length; i++) {
+            int pos = (idx + i) % keys.length;
+            if (values[pos] == null) {
+                keys[pos] = key;
+                values[pos] = value;
+                size++;
+                return null;
+            } else if (keys[pos].equals(key)) {
+                Vector3 old = values[pos];
+                values[pos] = value;
+                return old;
+            }
+        }
+        throw new RuntimeException();
     }
 
-    // Returns the value associated with the specified key, i.e. the method returns the force vector
-    // associated with the specified key. Returns 'null' if the key is not contained in this map.
-    // Precondition: key != null.
+    private void doubleCapacity() {
+        Massive[] oldKeys = keys;
+        Vector3[] oldValues = values;
+        keys = new Massive[keys.length * 2];
+        values = new Vector3[values.length * 2];
+        size = 0;
+
+        for (int i = 0; i < oldKeys.length; i++) {
+            Massive k = oldKeys[i];
+            Vector3 v = oldValues[i];
+            if (v != null) put(k, v);
+        }
+    }
+
+    /**
+     * Returns the value associated with the specified key, i.e. the method returns the force vector
+     * associated with the specified key. Returns 'null' if the key is not contained in this map.
+     * Precondition: key != null.
+     */
     public Vector3 get(Massive key) {
-
-        // TODO: implement method.
+        int idx = ((key.hashCode() % keys.length) + keys.length) % keys.length;
+        for (int i = 0; i < keys.length; i++) {
+            int pos = (idx + i) % keys.length;
+            if (keys[pos] == null) {
+                break;
+            } else if (keys[pos].equals(key)) {
+                return values[pos];
+            }
+        }
         return null;
     }
 
-    // Returns 'true' if this map contains a mapping for the specified key.
+    /**
+     * Returns 'true' if this map contains a mapping for the specified key.
+     */
     public boolean containsKey(Massive key) {
-
-        // TODO: implement method.
-        return false;
+        return this.get(key) != null;
     }
 
-    // Returns a readable representation of this map, with all key-value pairs. Their order is not
-    // defined.
+    /**
+     * Returns a readable representation of this map, with all key-value pairs. Their order is not
+     * defined.
+     */
+    @Override
     public String toString() {
+        if (size == 0) return "{}";
 
-        // TODO: implement method.
-        return "";
+        StringBuilder sb = new StringBuilder("{");
+        for (int i = 0; i < keys.length; i++) {
+            Massive k = keys[i];
+            Vector3 v = values[i];
+            if (k != null && v != null) {
+                sb.append("\n  ");
+                sb.append(k);
+                sb.append(": ");
+                sb.append(v);
+                sb.append(",");
+            }
+        }
+        sb.deleteCharAt(sb.length() - 1);
+        sb.append("\n}");
+        return sb.toString();
     }
 
-    // Compares `this` with the specified object for equality. Returns `true` if the specified
-    // `o` is not `null` and is of type `MassiveForceHashMap` and both `this` and `o` have equal
-    // key-value pairs, i.e. the number of key-value pairs is the same in both maps and every
-    // key-value pair in `this` equals one key-value pair in `o`. Two key-value pairs are
-    // equal if the two keys are equal and the two values are equal. Otherwise `false` is returned.
+    /**
+     * Compares `this` with the specified object for equality. Returns `true` if the specified
+     * `o` is not `null` and is of type `MassiveForceHashMap` and both `this` and `o` have equal
+     * key-value pairs, i.e. the number of key-value pairs is the same in both maps and every
+     * key-value pair in `this` equals one key-value pair in `o`. Two key-value pairs are
+     * equal if the two keys are equal and the two values are equal. Otherwise, `false` is returned.
+     */
+    @Override
     public boolean equals(Object o) {
+        if (!(o instanceof MassiveForceHashMap map) || map.size != size)
+            return false;
 
-        // TODO: implement method.
-        return false;
+        for (int i = 0; i < keys.length; i++) {
+            Massive k1 = keys[i];
+            Vector3 v1 = values[i];
+            if (k1 == null || v1 == null) continue;
+            Vector3 v2 = map.get(k1);
+            if (!v1.equals(v2)) return false;
+        }
+        return true;
     }
 
-    // Returns the hashCode of `this`.
+    /**
+     * Returns the hashCode of `this`.
+     */
+    @Override
     public int hashCode() {
-
-        //TODO: implement method.
-        return 0;
+        int hash = 0;
+        for (int i = 0; i < keys.length; i++) {
+            Massive k = keys[i];
+            Vector3 v = values[i];
+            if (k == null || v == null) continue;
+            hash ^= k.hashCode();
+            hash ^= v.hashCode();
+        }
+        return hash;
     }
 
-    // Returns a list of all the keys in no specified order.
+    /**
+     * Returns a list of all the keys in no specified order.
+     */
     public MassiveLinkedList keyList() {
-
-        // TODO: implement method.
-        return null;
+        MassiveLinkedList list = new MassiveLinkedList();
+        for (int i = 0; i < keys.length; i++) {
+            if (keys[i] != null && values[i] != null)
+                list.addLast(keys[i]);
+        }
+        return list;
     }
-
-}
+}

src/MassiveLinkedList.java

@@ -1,95 +1,218 @@
-// A list of massive objects implemented as a linked list.
-// The number of elements of the list is not limited.
-public class MassiveLinkedList {
+import java.util.Iterator;
 
-    //TODO: declare variables.
+/**
+ * A list of massive objects implemented as a linked list.
+ * The number of elements of the list is not limited.
+ */
+public class MassiveLinkedList implements Iterable<Massive> {
+    private int size = 0;
+    private Item first;
+    private Item last;
 
-    // Initializes 'this' as an empty list.
+    /**
+     * Initializes 'this' as an empty list.
+     */
     public MassiveLinkedList() {
-
-        //TODO: define constructor.
+        first = null;
+        last = null;
     }
 
-    // Initializes 'this' as an independent copy of the specified list 'list'.
-    // Calling methods of this list will not affect the specified list 'list'
-    // and vice versa.
-    // Precondition: list != null.
+    /**
+     * Initializes 'this' as an independent copy of the specified list 'list'.
+     * Calling methods of this list will not affect the specified list 'list'
+     * and vice versa.
+     * Precondition: list != null.
+     */
     public MassiveLinkedList(BodyLinkedList list) {
-
-        //TODO: define constructor.
+        this.size = 0;
+        for (Body b : list) {
+            this.addLast(b);
+        }
     }
 
-    // Inserts the specified element 'body' at the beginning of this list.
+    /**
+     * Inserts the specified element 'body' at the beginning of this list.
+     */
     public void addFirst(Massive body) {
-
-        //TODO: implement method.
+        if (first == null) {
+            first = new Item(body);
+            last = first;
+        } else {
+            first.setPrev(new Item(body));
+            first = first.prev;
+        }
+        size++;
     }
 
-    // Appends the specified element 'body' to the end of this list.
+    /**
+     * Appends the specified element 'body' to the end of this list.
+     */
     public void addLast(Massive body) {
-
-        //TODO: implement method.
+        if (last == null) {
+            last = new Item(body);
+            first = last;
+        } else {
+            last.setNext(new Item(body));
+            last = last.next;
+        }
+        size++;
     }
 
-    // Returns the last element in this list.
-    // Returns 'null' if the list is empty.
+    /**
+     * Returns the last element in this list.
+     * Returns 'null' if the list is empty.
+     */
     public Massive getLast() {
-
-        //TODO: implement method.
-        return null;
+        return (last != null) ? last.body : null;
     }
 
-    // Returns the first element in this list.
-    // Returns 'null' if the list is empty.
+    /**
+     * Returns the first element in this list.
+     * Returns 'null' if the list is empty.
+     */
     public Massive getFirst() {
-
-        //TODO: implement method.
-        return null;
+        return (first != null) ? first.body : null;
     }
 
-    // Retrieves and removes the first element in this list.
-    // Returns 'null' if the list is empty.
+    /**
+     * Retrieves and removes the first element in this list.
+     * Returns 'null' if the list is empty.
+     */
     public Massive pollFirst() {
-
-        //TODO: implement method.
-        return null;
+        if (first == null) {
+            return null;
+        }
+        Massive m = first.body;
+        first = first.next;
+        if (first != null) first.setPrev(null);
+        size--;
+        return m;
     }
 
-    // Retrieves and removes the last element in this list.
-    // Returns 'null' if the list is empty.
+    /**
+     * Retrieves and removes the last element in this list.
+     * Returns 'null' if the list is empty.
+     */
     public Massive pollLast() {
-
-        //TODO: implement method.
-        return null;
+        if (last == null) {
+            return null;
+        }
+        Massive m = last.body;
+        last = last.next;
+        if (last != null) last.setNext(null);
+        size--;
+        return m;
     }
 
-    // Inserts the specified element at the specified position in this list.
-    // Precondition: i >= 0 && i <= size().
+    /**
+     * Inserts the specified element at the specified position in this list.
+     * Precondition: i >= 0 && i <= size().
+     */
     public void add(int i, Massive m) {
+        if (first == null || i == 0) {
+            addFirst(m);
+            return;
+        } else if (i == size) {
+            addLast(m);
+            return;
+        }
 
-        //TODO: implement method.
+        Item item = first;
+        for (int j = 0; j < i; j++) {
+            item = item.next;
+        }
+
+        item.prev.setNext(new Item(m));
+        item.setPrev(item.prev.next);
+        size++;
     }
 
-    // Returns the element at the specified position in this list.
-    // Precondition: i >= 0 && i < size().
+    /**
+     * Returns the element at the specified position in this list.
+     * Precondition: i >= 0 && i < size().
+     */
     public Massive get(int i) {
-
-        //TODO: implement method.
-        return null;
+        Item item;
+        if (i < size / 2) {
+            item = first;
+            for (int j = 0; j < i; j++) {
+                item = item.next;
+            }
+        } else {
+            item = last;
+            for (int j = size - 1; j > i; j--) {
+                item = item.prev;
+            }
+        }
+        return item.body;
     }
 
-    // Returns the index of the first occurrence of the specified element in this list, or -1 if
-    // this list does not contain the element.
+    /**
+     * Returns the index of the first occurrence of the specified element in this list, or -1 if
+     * this list does not contain the element.
+     */
     public int indexOf(Massive m) {
+        if (first == null) {
+            return -1;
+        }
 
-        //TODO: implement method.
-        return -2;
-    }
+        Item item = first;
+        for (int i = 0; i < size; i++, item = item.next) {
+            if (item.body.equals(m)) return i;
+        }
 
-    // Returns the number of elements in this list.
-    public int size() {
-
-        //TODO: implement method.
         return -1;
     }
+
+    /**
+     * Returns the number of elements in this list.
+     */
+    public int size() {
+        return size;
+    }
+
+    @Override
+    public Iterator<Massive> iterator() {
+        return new Iterator<>() {
+            Item ptr = first;
+            boolean yieldedFirst = false;
+
+            @Override
+            public boolean hasNext() {
+                return ptr != null && (!yieldedFirst || ptr.next != null);
+            }
+
+            @Override
+            public Massive next() {
+                if (!yieldedFirst) {
+                    yieldedFirst = true;
+                } else {
+                    ptr = ptr.next;
+                }
+                return ptr.body;
+            }
+        };
+    }
+
+    private class Item {
+        private final Massive body;
+        private Item prev;
+        private Item next;
+
+        public Item(Massive body) {
+            this.body = body;
+            this.prev = null;
+            this.next = null;
+        }
+
+        public void setPrev(Item prev) {
+            this.prev = prev;
+            if (prev != null) prev.next = this;
+        }
+
+        public void setNext(Item next) {
+            this.next = next;
+            if (next != null) next.prev = this;
+        }
+    }
 }

src/NamedBody.java

@@ -1,42 +1,79 @@
-public class NamedBody /* TODO: add clause(s) */
-{
+import codedraw.CodeDraw;
 
-    // TODO: add missing parts of this class.
+public class NamedBody implements Massive {
 
-    // Initializes this with name, mass, current position and movement. The associated force
-    // is initialized with a zero vector.
+    private final String name;
+    private final Body body;
+
+    /**
+     * Initializes this with name, mass, current position and movement.
+     */
     public NamedBody(String name, double mass, Vector3 massCenter, Vector3 currentMovement) {
-        // TODO: implement constructor.
-
+        this(name, new Body(mass, massCenter, currentMovement));
     }
 
-    // Returns the name of the body.
+    public NamedBody(String name, Body body) {
+        this.name = name;
+        this.body = body;
+    }
+
+    public NamedBody(NamedBody other) {
+        this(other.name, new Body(other.body));
+    }
+
+    /**
+     * Returns the name of the body.
+     */
     public String getName() {
-        // TODO: implement method.
-        return "";
-
+        return name;
     }
 
-    // Compares `this` with the specified object. Returns `true` if the specified `o` is not
-    // `null` and is of type `NamedBody` and both `this` and `o` have equal names.
-    // Otherwise `false` is returned.
+    public Body getBody() {
+        return body;
+    }
+
+    public Vector3 getMassCenter() {
+        return body.getMassCenter();
+    }
+
+    public double getMass() {
+        return body.getMass();
+    }
+
+    /**
+     * Compares `this` with the specified object. Returns `true` if the specified `o` is not
+     * `null` and is of type `NamedBody` and both `this` and `o` have equal names.
+     * Otherwise, `false` is returned.
+     */
+    @Override
     public boolean equals(Object o) {
-        //TODO: implement method.
-        return false;
-
+        if (!(o instanceof NamedBody b)) return false;
+        return this.name.equals(b.name);
     }
 
-    // Returns the hashCode of `this`.
+    /**
+     * Returns the hashCode of `this`.
+     */
+    @Override
     public int hashCode() {
-        //TODO: implement method.
-        return 0;
-
+        return this.name.hashCode();
     }
 
-    // Returns a readable representation including the name of this body.
+    /**
+     * Returns a readable representation including the name of this body.
+     */
+    @Override
     public String toString() {
-        //TODO: implement method.
-        return "";
+        return this.getName();
+    }
 
+    @Override
+    public void move(Vector3 force) {
+        body.move(force);
+    }
+
+    @Override
+    public void draw(CodeDraw cd) {
+        body.draw(cd);
     }
 }

src/NamedBodyForcePair.java

@@ -6,8 +6,7 @@ import codedraw.CodeDraw;
  */
 public class NamedBodyForcePair implements CosmicSystem {
 
-    private final String name;
-    private final Body body;
+    private final NamedBody body;
     private final Vector3 force = new Vector3();
 
     /**
@@ -15,27 +14,30 @@ public class NamedBodyForcePair implements CosmicSystem {
      * is initialized with a zero vector.
      */
     public NamedBodyForcePair(String name, double mass, Vector3 massCenter, Vector3 currentMovement) {
-        this(name, new Body(mass, massCenter, currentMovement));
+        this(new NamedBody(name, mass, massCenter, currentMovement));
     }
 
-    public NamedBodyForcePair(String name, Body b) {
-        this.body = b;
-        this.name = name;
+    public NamedBodyForcePair(String name, Body body) {
+        this(new NamedBody(name, body));
+    }
+
+    public NamedBodyForcePair(NamedBody body) {
+        this.body = body;
     }
 
     public NamedBodyForcePair(NamedBodyForcePair other) {
-        this(other.name, new Body(other.body));
+        this(new NamedBody(other.body));
     }
 
     public Body getBody() {
-        return body;
+        return body.getBody();
     }
 
     /**
      * Returns the name of the body.
      */
     public String getName() {
-        return name;
+        return body.getName();
     }
 
     @Override
@@ -70,13 +72,13 @@ public class NamedBodyForcePair implements CosmicSystem {
 
     @Override
     public void addForceTo(CosmicSystem cs) {
-        cs.addForceFrom(body);
+        cs.addForceFrom(body.getBody());
     }
 
     @Override
     public BodyLinkedList getBodies() {
         BodyLinkedList list = new BodyLinkedList();
-        list.addFirst(body);
+        list.addFirst(body.getBody());
         return list;
     }
 

src/Simulation5.java

@@ -3,8 +3,9 @@ import codedraw.CodeDraw;
 import java.awt.*;
 import java.util.Random;
 
-// Simulates the formation of a massive solar system.
-//
+/**
+ * Simulates the formation of a massive solar system.
+ */
 public class Simulation5 {
 
     // gravitational constant
@@ -30,39 +31,83 @@ public class Simulation5 {
 
     // all quantities are based on units of kilogram respectively second and meter.
 
-    // The main simulation method using instances of other classes.
+    /**
+     * The main simulation method using instances of other classes.
+     */
     public static void main(String[] args) {
 
         // simulation
         CodeDraw cd = new CodeDraw();
 
         // create solar system with 12 bodies
-        NamedBody sun = new NamedBody("Sun",1.989E30, new Vector3(0.0,0.0,0.0), new Vector3(0.0,0.0,0.0));
-        NamedBody earth = new NamedBody("Earth",5.972E24, new Vector3(-6.13135922534815E10,-1.383789852227691E11,2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
-        NamedBody moon = new NamedBody("Moon",7.349E22, new Vector3(-6.132484773775896E10,-1.387394951280871E11,1.701046736294776E7), new Vector3(27916.62329282941,-12020.39526008238,-94.89703264508708));
-        NamedBody mars = new NamedBody("Mars",6.41712E23, new Vector3(-1.7923193702925848E11,1.726665823982123E11,7.991673845249474E9), new Vector3(-15925.78496403673,-15381.16179928219,68.67560910598857));
-        NamedBody deimos = new NamedBody("Deimos",1.8E20, new Vector3(-1.792255010450533E11,1.726891122683271E11,7.990659337380297E9), new Vector3(-17100.476719804457,-15020.348656808,631.2927851249581));
-        NamedBody phobos = new NamedBody("Phobos",1.08E20, new Vector3(-1.792253482539647E11,1.72661109673625E11,7.987848354800322E9), new Vector3(-14738.203714241401,-13671.17675223948,-411.0012490555253));
-        NamedBody mercury = new NamedBody("Mercury",3.301E23, new Vector3(-5.167375560011926E10,-4.217574885682655E10,1.14808913958168E9), new Vector3(21580.25398577148,-34951.03632847389,-4835.225596525241));
-        NamedBody venus = new NamedBody("Venus",4.86747E24, new Vector3(-3.123150865740532E10,1.0395568504115701E11,3.173401325838074E9), new Vector3(-33748.180519629335,-10014.25141045021,1809.94488874165));
-        NamedBody vesta = new NamedBody("Vesta",2.5908E20, new Vector3(-3.337493557929893E11,-4.7147908276077385E10,4.1923010146878105E10), new Vector3(4440.54247538484,-19718.49074006637,48.06573124543601));
-        NamedBody pallas = new NamedBody("Pallas",2.14E20, new Vector3(4.3452066613895575E11,-2.057319365171432E11,1.0549957423213101E11), new Vector3(5058.947582097117,11184.45711782372,-8183.524138259704));
-        NamedBody hygiea = new NamedBody("Hygiea",8.32E19, new Vector3(-3.983943433707043E11,2.325833000024021E11,-2.233667695713672E10), new Vector3(-6931.864585548552,-15686.8108598699,-690.5791992347208));
-        NamedBody ceres = new NamedBody("Ceres",9.394E20, new Vector3(3.781372641419032E11,1.96718960466285E11,-6.366459168068592E10), new Vector3(-8555.324226752316,14718.33755980907,2040.230135060142));
-
+        NamedBody sun = new NamedBody(SolSystem4.SUN_NAMED);
+        NamedBody earth = new NamedBody(SolSystem4.EARTH_NAMED);
+        NamedBody moon = new NamedBody(SolSystem4.MOON_NAMED);
+        NamedBody mars = new NamedBody(SolSystem4.MARS_NAMED);
+        NamedBody deimos = new NamedBody(SolSystem4.DEIMOS_NAMED);
+        NamedBody phobos = new NamedBody(SolSystem4.PHOBOS_NAMED);
+        NamedBody mercury = new NamedBody(SolSystem4.MERCURY_NAMED);
+        NamedBody venus = new NamedBody(SolSystem4.VENUS_NAMED);
+        NamedBody vesta = new NamedBody(SolSystem4.VESTA_NAMED);
+        NamedBody pallas = new NamedBody(SolSystem4.PALLAS_NAMED);
+        NamedBody hygiea = new NamedBody(SolSystem4.HYGIEA_NAMED);
+        NamedBody ceres = new NamedBody(SolSystem4.CERES_NAMED);
         // create some additional bodies
         Body[] bodies = new Body[NUMBER_OF_BODIES];
 
         Random random = new Random(2022);
 
         for (int i = 0; i < bodies.length; i++) {
-            bodies[i] = new Body(Math.abs(random.nextGaussian()) * OVERALL_SYSTEM_MASS / bodies.length,
+            bodies[i] = new Body(
+                    Math.abs(random.nextGaussian()) * OVERALL_SYSTEM_MASS / bodies.length,
                     new Vector3(0.2 * random.nextGaussian() * AU, 0.2 * random.nextGaussian() * AU, 0.2 * random.nextGaussian() * AU),
-                    new Vector3(0 + random.nextGaussian() * 5e3, 0 + random.nextGaussian() * 5e3, 0 + random.nextGaussian() * 5e3));
+                    new Vector3(0 + random.nextGaussian() * 5e3, 0 + random.nextGaussian() * 5e3, 0 + random.nextGaussian() * 5e3)
+            );
         }
 
-        //TODO: implementation of this method according to 'Aufgabenblatt5.md'.
-        //  Add both, NamedBody- and Body-objects, to your simulation.
+        MassiveForceHashMap forceOnBody = new MassiveForceHashMap();
+        forceOnBody.put(sun, new Vector3());
+        forceOnBody.put(earth, new Vector3());
+        forceOnBody.put(moon, new Vector3());
+        forceOnBody.put(mars, new Vector3());
+        forceOnBody.put(deimos, new Vector3());
+        forceOnBody.put(phobos, new Vector3());
+        forceOnBody.put(mercury, new Vector3());
+        forceOnBody.put(venus, new Vector3());
+        forceOnBody.put(vesta, new Vector3());
+        forceOnBody.put(pallas, new Vector3());
+        forceOnBody.put(hygiea, new Vector3());
+        forceOnBody.put(ceres, new Vector3());
 
+        for (Body b : bodies) {
+            forceOnBody.put(b, new Vector3());
+        }
+
+        long seconds = 0;
+        while (true) {
+            seconds++;
+
+            for (Massive b1 : forceOnBody.keyList()) {
+                Vector3 force = new Vector3();
+                for (Massive b2 : forceOnBody.keyList()) {
+                    if (b1 != b2) {
+                        force = force.plus(b1.gravitationalForce(b2));
+                    }
+                }
+                forceOnBody.put(b1, force);
+            }
+
+            for (Massive body : forceOnBody.keyList()) {
+                body.move(forceOnBody.get(body));
+            }
+
+            if ((seconds % 3600) == 0) {
+                cd.clear(Color.BLACK);
+                for (Massive body : forceOnBody.keyList()) {
+                    body.draw(cd);
+                }
+                cd.show();
+            }
+        }
     }
 }

src/SolSystem4.java

@@ -12,16 +12,16 @@ public class SolSystem4 {
     public static final Body HYGIEA = new Body(8.32E19, new Vector3(-3.983943433707043E11, 2.325833000024021E11, -2.233667695713672E10), new Vector3(-6931.864585548552, -15686.8108598699, -690.5791992347208));
     public static final Body CERES = new Body(9.394E20, new Vector3(3.781372641419032E11, 1.96718960466285E11, -6.366459168068592E10), new Vector3(-8555.324226752316, 14718.33755980907, 2040.230135060142));
 
-    public static final NamedBodyForcePair SUN_NAMED = new NamedBodyForcePair("Sun", SUN);
-    public static final NamedBodyForcePair EARTH_NAMED = new NamedBodyForcePair("Earth", EARTH);
-    public static final NamedBodyForcePair MOON_NAMED = new NamedBodyForcePair("Moon", MOON);
-    public static final NamedBodyForcePair MARS_NAMED = new NamedBodyForcePair("Mars", MARS);
-    public static final NamedBodyForcePair DEIMOS_NAMED = new NamedBodyForcePair("Deimos", DEIMOS);
-    public static final NamedBodyForcePair PHOBOS_NAMED = new NamedBodyForcePair("Phobos", PHOBOS);
-    public static final NamedBodyForcePair MERCURY_NAMED = new NamedBodyForcePair("Mercury", MERCURY);
-    public static final NamedBodyForcePair VENUS_NAMED = new NamedBodyForcePair("Venus", VENUS);
-    public static final NamedBodyForcePair VESTA_NAMED = new NamedBodyForcePair("Vesta", VESTA);
-    public static final NamedBodyForcePair PALLAS_NAMED = new NamedBodyForcePair("Pallas", PALLAS);
-    public static final NamedBodyForcePair HYGIEA_NAMED = new NamedBodyForcePair("Hygiea", HYGIEA);
-    public static final NamedBodyForcePair CERES_NAMED = new NamedBodyForcePair("Ceres", CERES);
+    public static final NamedBody SUN_NAMED = new NamedBody("Sun", SUN);
+    public static final NamedBody EARTH_NAMED = new NamedBody("Earth", EARTH);
+    public static final NamedBody MOON_NAMED = new NamedBody("Moon", MOON);
+    public static final NamedBody MARS_NAMED = new NamedBody("Mars", MARS);
+    public static final NamedBody DEIMOS_NAMED = new NamedBody("Deimos", DEIMOS);
+    public static final NamedBody PHOBOS_NAMED = new NamedBody("Phobos", PHOBOS);
+    public static final NamedBody MERCURY_NAMED = new NamedBody("Mercury", MERCURY);
+    public static final NamedBody VENUS_NAMED = new NamedBody("Venus", VENUS);
+    public static final NamedBody VESTA_NAMED = new NamedBody("Vesta", VESTA);
+    public static final NamedBody PALLAS_NAMED = new NamedBody("Pallas", PALLAS);
+    public static final NamedBody HYGIEA_NAMED = new NamedBody("Hygiea", HYGIEA);
+    public static final NamedBody CERES_NAMED = new NamedBody("Ceres", CERES);
 }