Examples of java.util.NavigableSet.pollFirst()

java.util.NavigableSet.pollFirst()
Retrieves and removes the first (lowest) element, or returns {@code null} if this set is empty. @return the first element, or {@code null} if this set is empty

        NavigableSet keySet = navigableMap_startExcluded_endExcluded
                .navigableKeySet();
        Iterator iterator = keySet.iterator();
        assertEquals(8, keySet.size());
        for (int value = 101; value < 109; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }

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        assertEquals(8, keySet.size());
        for (int value = 101; value < 109; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }


    public void test_AscendingSubMapKeySet_pollFirst_startExcluded_endIncluded() {
        NavigableSet keySet = navigableMap_startExcluded_endIncluded
                .navigableKeySet();

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        NavigableSet keySet = navigableMap_startExcluded_endIncluded
                .navigableKeySet();
        Iterator iterator = keySet.iterator();
        assertEquals(9, keySet.size());
        for (int value = 101; value < 110; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }

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        assertEquals(9, keySet.size());
        for (int value = 101; value < 110; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }


    public void test_AscendingSubMapKeySet_pollFirst_startIncluded_endExcluded() {
        NavigableSet keySet = navigableMap_startIncluded_endExcluded
                .navigableKeySet();

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        NavigableSet keySet = navigableMap_startIncluded_endExcluded
                .navigableKeySet();
        Iterator iterator = keySet.iterator();
        assertEquals(9, keySet.size());
        for (int value = 100; value < 109; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }

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        assertEquals(9, keySet.size());
        for (int value = 100; value < 109; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }


    public void test_AscendingSubMapKeySet_pollFirst_startIncluded_endIncluded() {
        NavigableSet keySet = navigableMap_startIncluded_endIncluded
                .navigableKeySet();

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        NavigableSet keySet = navigableMap_startIncluded_endIncluded
                .navigableKeySet();
        Iterator iterator = keySet.iterator();
        assertEquals(10, keySet.size());
        for (int value = 100; value < 110; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }

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        assertEquals(10, keySet.size());
        for (int value = 100; value < 110; value++) {
            assertEquals(new Integer(value).toString(), keySet.pollFirst());
        }
        assertEquals(0, keySet.size());
        assertNull(keySet.pollFirst());
    }


    public void test_AscendingSubMapKeySet_pollFirst() {
        String endKey = new Integer(2).toString();
        NavigableSet keySet = tm.headMap(endKey, true).navigableKeySet();

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    }


    public void test_AscendingSubMapKeySet_pollFirst() {
        String endKey = new Integer(2).toString();
        NavigableSet keySet = tm.headMap(endKey, true).navigableKeySet();
        assertEquals(new Integer(0).toString(), keySet.pollFirst());


        keySet = tm.tailMap(endKey, true).navigableKeySet();
        assertEquals(new Integer(2).toString(), keySet.pollFirst());
    }

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        String endKey = new Integer(2).toString();
        NavigableSet keySet = tm.headMap(endKey, true).navigableKeySet();
        assertEquals(new Integer(0).toString(), keySet.pollFirst());


        keySet = tm.tailMap(endKey, true).navigableKeySet();
        assertEquals(new Integer(2).toString(), keySet.pollFirst());
    }


    public void test_AscendingSubMapKeySet_pollLast_startExcluded_endExcluded() {
        NavigableSet keySet = navigableMap_startExcluded_endExcluded
                .navigableKeySet();

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