Examples of java.util.EnumMap.keySet()

java.util.EnumMap.keySet()
Returns a {@link Set} view of the keys contained in this map.The returned set obeys the general contract outlined in {@link Map#keySet()}. The set's iterator will return the keys in their natural order (the order in which the enum constants are declared). @return a set view of the keys contained in this enum map

    @SuppressWarnings( { "unchecked", "boxing" })
    public void test_keySet() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 2);
        enumSizeMap.put(Size.Big, null);
        Set set = enumSizeMap.keySet();


        Set set1 = enumSizeMap.keySet();
        assertSame("Should be same", set1, set); //$NON-NLS-1$
        try {
            set.add(Size.Big);

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        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 2);
        enumSizeMap.put(Size.Big, null);
        Set set = enumSizeMap.keySet();


        Set set1 = enumSizeMap.keySet();
        assertSame("Should be same", set1, set); //$NON-NLS-1$
        try {
            set.add(Size.Big);
            fail("Should throw UnsupportedOperationException"); //$NON-NLS-1$
        } catch (UnsupportedOperationException e) {

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        assertEquals("Wrong size", 0, set.size()); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        Collection c = new ArrayList();
        c.add(Size.Big);
        assertTrue("Should return true", set.containsAll(c)); //$NON-NLS-1$
        c.add(Size.Small);
        assertFalse("Should return false", set.containsAll(c)); //$NON-NLS-1$

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        assertEquals("Wrong key", Size.Big, array[0]); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        c = new ArrayList();
        c.add(Color.Blue);
        assertFalse("Should return false", set.remove(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 2, set.size()); //$NON-NLS-1$
        assertTrue("Should return true", set.retainAll(c)); //$NON-NLS-1$

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        assertEquals("Wrong size", 0, set.size()); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();


        Iterator iter = set.iterator();
        Enum enumKey = (Enum) iter.next();
        assertTrue("Returned false for contained object", set.contains(enumKey)); //$NON-NLS-1$
        enumKey = (Enum) iter.next();

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        assertTrue("Returned false for contained object", set.contains(enumKey)); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        iter = set.iterator();
        try {
            iter.remove();
            fail("Should throw IllegalStateException"); //$NON-NLS-1$
        } catch (IllegalStateException e) {

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    @SuppressWarnings( { "unchecked", "boxing" })
    public void test_keySet() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 2);
        enumSizeMap.put(Size.Big, null);
        Set set = enumSizeMap.keySet();


        Set set1 = enumSizeMap.keySet();
        assertSame("Should be same", set1, set); //$NON-NLS-1$
        try {
            set.add(Size.Big);

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        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 2);
        enumSizeMap.put(Size.Big, null);
        Set set = enumSizeMap.keySet();


        Set set1 = enumSizeMap.keySet();
        assertSame("Should be same", set1, set); //$NON-NLS-1$
        try {
            set.add(Size.Big);
            fail("Should throw UnsupportedOperationException"); //$NON-NLS-1$
        } catch (UnsupportedOperationException e) {

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        assertEquals("Wrong size", 0, set.size()); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        Collection c = new ArrayList();
        c.add(Size.Big);
        assertTrue("Should return true", set.containsAll(c)); //$NON-NLS-1$
        c.add(Size.Small);
        assertFalse("Should return false", set.containsAll(c)); //$NON-NLS-1$

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        assertEquals("Wrong key", Size.Big, array[0]); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        c = new ArrayList();
        c.add(Color.Blue);
        assertFalse("Should return false", set.remove(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 2, set.size()); //$NON-NLS-1$
        assertTrue("Should return true", set.retainAll(c)); //$NON-NLS-1$

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