Examples of java.util.NavigableSet.descendingSet()

java.util.NavigableSet.descendingSet()
Returns a reverse order view of the elements contained in this set. The descending set is backed by this set, so changes to the set are reflected in the descending set, and vice-versa. If either set is modified while an iteration over either set is in progress (except through the iterator's own {@code remove} operation), the results ofthe iteration are undefined.
The returned set has an ordering equivalent to {@link Collections#reverseOrder(Comparator) Collections.reverseOrder}(comparator()). The expression {@code s.descendingSet().descendingSet()} returns aview of {@code s} essentially equivalent to {@code s}. @return a reverse order view of this set

            ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
            assertEquals(new Integer(j - i).toString(), ceilingKey);
        }


        keySet = navigableMap_startIncluded_endIncluded.navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        keyArray = (String[]) descendingKeySet
                .toArray(new String[descendingKeySet.size()]);
        for (int i = 0, j = 109; i < keyArray.length; i++) {
            ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
            assertEquals(new Integer(j - i).toString(), ceilingKey);

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            assertEquals(new Integer(j - i).toString(), ceilingKey);
        }


        key = new Integer(2).toString();
        keySet = tm.headMap(key, true).navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        Iterator iterator = descendingKeySet.iterator();
        assertEquals(key, descendingKeySet.ceiling(iterator.next()));
        try {
            descendingKeySet.ceiling(null);
            fail("should throw NPE");

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        key = new Integer(0).toString();
        String endKey = key;


        keySet = tm.headMap(endKey, true).navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        assertEquals(key, descendingKeySet.ceiling(endKey));


        key = new Integer(0).toString();
        keySet = tm.headMap(endKey, false).navigableKeySet();
        descendingKeySet = keySet.descendingSet();

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        descendingKeySet = keySet.descendingSet();
        assertEquals(key, descendingKeySet.ceiling(endKey));


        key = new Integer(0).toString();
        keySet = tm.headMap(endKey, false).navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        assertNull(descendingKeySet.ceiling(endKey));


        endKey = new Integer(999).toString();
        keySet = tm.headMap(endKey, true).navigableKeySet();
        descendingKeySet = keySet.descendingSet();

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        descendingKeySet = keySet.descendingSet();
        assertNull(descendingKeySet.ceiling(endKey));


        endKey = new Integer(999).toString();
        keySet = tm.headMap(endKey, true).navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        assertEquals(new Integer(999).toString(), descendingKeySet
                .ceiling(endKey));
        assertEquals(key, descendingKeySet.ceiling(key));


        endKey = new Integer(999).toString();

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                .ceiling(endKey));
        assertEquals(key, descendingKeySet.ceiling(key));


        endKey = new Integer(999).toString();
        keySet = tm.headMap(endKey, false).navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        assertEquals(new Integer(998).toString(), descendingKeySet
                .ceiling(endKey));
        assertEquals(key, descendingKeySet.ceiling(key));


        // With Comparator

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        assertEquals(key, descendingKeySet.ceiling(key));


        // With Comparator
        keySet = ((NavigableMap) subMap_startExcluded_endExcluded_comparator)
                .navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        keyArray = (String[]) descendingKeySet
                .toArray(new String[descendingKeySet.size()]);
        for (int i = 0, j = 108; i < keyArray.length; i++) {
            ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
            assertEquals(new Integer(j - i).toString(), ceilingKey);

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        ceilingKey = (String) descendingKeySet.ceiling(key);
        assertNull(ceilingKey);


        keySet = ((NavigableMap) subMap_startExcluded_endIncluded_comparator)
                .navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        keyArray = (String[]) descendingKeySet
                .toArray(new String[descendingKeySet.size()]);
        for (int i = 0, j = 109; i < keyArray.length; i++) {
            ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
            assertEquals(new Integer(j - i).toString(), ceilingKey);

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            assertEquals(new Integer(j - i).toString(), ceilingKey);
        }


        keySet = ((NavigableMap) subMap_startIncluded_endExcluded_comparator)
                .navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        keyArray = (String[]) descendingKeySet
                .toArray(new String[descendingKeySet.size()]);
        for (int i = 0, j = 108; i < keyArray.length; i++) {
            ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
            assertEquals(new Integer(j - i).toString(), ceilingKey);

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            assertEquals(new Integer(j - i).toString(), ceilingKey);
        }


        keySet = ((NavigableMap) subMap_startIncluded_endIncluded_comparator)
                .navigableKeySet();
        descendingKeySet = keySet.descendingSet();
        keyArray = (String[]) descendingKeySet
                .toArray(new String[descendingKeySet.size()]);
        for (int i = 0, j = 109; i < keyArray.length; i++) {
            ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
            assertEquals(new Integer(j - i).toString(), ceilingKey);

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