MyArrayList - Complete

.idea/workspace.xml

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-            <element signature="e#1104#1105#0" expanded="true" />
-            <element signature="e#1169#1170#0" expanded="true" />
-            <element signature="e#1222#1223#0" expanded="true" />
-            <element signature="e#1280#1281#0" expanded="true" />
-            <element signature="e#3063#3064#0" expanded="true" />
-            <element signature="e#3091#3092#0" expanded="true" />
-            <element signature="e#3153#3154#0" expanded="true" />
-            <element signature="e#3181#3182#0" expanded="true" />
+            <element signature="e#7536#7544#0" expanded="true" />
+            <element signature="e#8053#8061#0" expanded="true" />
+            <element signature="e#8540#8548#0" expanded="true" />
           </folding>
         </state>
       </provider>

src/main/java/MySet.java

@@ -137,6 +137,8 @@ public class MySet<T> extends MyArrayList implements Set {
 // change boolean value
     @Override
     public boolean addAll(Collection c) {
+        boolean returnValue = false;
+
         T[] newGenericSet = Arrays.copyOf(this.genericSet, size());
 
         int i = size();
@@ -145,11 +147,13 @@ public class MySet<T> extends MyArrayList implements Set {
                 newGenericSet = Arrays.copyOf(genericSet, genericSet.length + 1);
                 newGenericSet[i] = (T)elem;
                 genericSet = newGenericSet;
+
                 i++;
+                returnValue = true;
             }
         }
         genericSet = newGenericSet;
-        return false;
+        return returnValue;
     }
 
     @Override
@@ -157,7 +161,7 @@ public class MySet<T> extends MyArrayList implements Set {
         T[] newGenericSet = null;
         genericSet = newGenericSet;
     }
-///
+
     @Override
     public boolean removeAll(Collection c) {
         boolean returnValue = false;
@@ -177,15 +181,31 @@ public class MySet<T> extends MyArrayList implements Set {
         genericSet = newGenericSet;
         return returnValue;
     }
-///
+
     @Override
     public boolean retainAll(Collection c) {
-        return false;
+
+        boolean returnValue = false;
+
+        T[] newGenericSet = (T[]) Array.newInstance(this.genericSet.getClass().getComponentType(), 0);
+
+        int i = 0;
+        for (Object elem: genericSet) {
+            if (c.contains(elem)){
+                newGenericSet = Arrays.copyOf(newGenericSet, newGenericSet.length + 1);
+                newGenericSet[i] = (T)elem;
+
+                returnValue = true;
+                i++;
+            }
+        }
+        genericSet = newGenericSet;
+        return returnValue;
     }
 
     @Override
     public boolean containsAll(Collection c) {
-        return false;
+        return this.addAll(c);
     }
 
 

src/test/java/MySetTest.java

@@ -146,6 +146,23 @@ public class MySetTest {
     }
 
     @Test
+    public void containsAllLongBooleanTest() {
+        // Given
+        boolean expected = true;
+        Long[] inputArray = {1L, 2L, 3L, 4L};
+        ArrayList<Long> addAllArray = new ArrayList<>();
+        addAllArray.add(5L); addAllArray.add(6L); addAllArray.add(7L);  addAllArray.add(1L); addAllArray.add(7L);
+
+        MySet<Long> mySet = new MySet<Long>(inputArray);
+
+        // When
+        boolean actual = mySet.containsAll(addAllArray);
+
+        // Then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
     public void clearLongTest() {
         // Given
         Long[] inputArray = {1L, 2L, 3L, 4L};
@@ -277,4 +294,55 @@ public class MySetTest {
         // Then
         Assert.assertEquals(expected, actual);
     }
+    @Test
+    public void retainAllStringTest() {
+        // Given
+        String[] expected = {"a", "4"};
+        String[] inputArray = {"a", "2", "3", "4"};
+        ArrayList<String> retainAllArray = new ArrayList<>();
+        retainAllArray.add("4"); retainAllArray.add("a");
+
+        MySet<String> mySet = new MySet<String>(inputArray);
+
+        // When
+        mySet.retainAll(retainAllArray);
+        String[] actual = mySet.get();
+
+        // Then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void retainAllStringBooleanTest() {
+        // Given
+        boolean expected = true;
+        String[] inputArray = {"a", "2", "3", "4"};
+        ArrayList<String> retainAllArray = new ArrayList<>();
+        retainAllArray.add("4"); retainAllArray.add("a");
+
+        MySet<String> mySet = new MySet<String>(inputArray);
+
+        // When
+        boolean actual = mySet.retainAll(retainAllArray);
+
+        // Then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void retainAllStringBooleanTest1() {
+        // Given
+        boolean expected = false;
+        String[] inputArray = {"a", "2", "3", "4"};
+        ArrayList<String> retainAllArray = new ArrayList<>();
+        retainAllArray.add("5"); retainAllArray.add("b");
+
+        MySet<String> mySet = new MySet<String>(inputArray);
+
+        // When
+        boolean actual = mySet.retainAll(retainAllArray);
+
+        // Then
+        Assert.assertEquals(expected, actual);
+    }
 }