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

        NavigableSet keySet, descendingKeySet;
        String[] keyArray;
        String floorKey;


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

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        key = new Integer(2).toString();
        floorKey = (String) descendingKeySet.floor(key);
        assertNull(floorKey);


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

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        Entry[] entryArray;


        entrySet = navigableMap_startExcluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.ceiling(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        }


        entrySet = navigableMap_startExcluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.ceiling(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        }


        entrySet = navigableMap_startIncluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.ceiling(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        Entry[] entryArray;


        entrySet = navigableMap_startExcluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.floor(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        }


        entrySet = navigableMap_startExcluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.floor(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        }


        entrySet = navigableMap_startIncluded_endExcluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.floor(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        // With Comparator
        entrySet = subMap_startExcluded_endExcluded_comparator.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.floor(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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        }


        entrySet = subMap_startExcluded_endIncluded_comparator.entrySet();
        if (entrySet instanceof NavigableSet) {
            ascendingSubMapEntrySet = (NavigableSet) entrySet;
            descendingSet = ascendingSubMapEntrySet.descendingSet();
            try {
                descendingSet.floor(null);
                fail("should throw NPE");
            } catch (NullPointerException e) {
                // Expected

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