Examples of java.util.NavigableSet.pollFirst()

    public void test_AscendingSubMapEntrySet_pollFirst_startIncluded_endIncluded() {
        Set entrySet = navigableMap_startIncluded_endIncluded.entrySet();
        if (entrySet instanceof NavigableSet) {
            NavigableSet ascendingSubMapEntrySet = (NavigableSet) entrySet;
            for (int value = 100; value < 110; value++) {
                Entry entry = (Entry) ascendingSubMapEntrySet.pollFirst();
                assertEquals(value, entry.getValue());
            }
            assertTrue(ascendingSubMapEntrySet.isEmpty());
            // should return null if the set is empty.
            assertNull(ascendingSubMapEntrySet.pollFirst());

                Entry entry = (Entry) ascendingSubMapEntrySet.pollFirst();
                assertEquals(value, entry.getValue());
            }
            assertTrue(ascendingSubMapEntrySet.isEmpty());
            // should return null if the set is empty.
            assertNull(ascendingSubMapEntrySet.pollFirst());
        }
    }


    public void test_AscendingSubMapEntrySet_pollLast_startExcluded_endExcluded() {
        Set entrySet = navigableMap_startExcluded_endExcluded.entrySet();

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