Examples of java.util.NavigableSet.lower()

java.util.NavigableSet.lower()
Returns the greatest element in this set strictly less than the given element, or {@code null} if there is no such element. @param e the value to match @return the greatest element less than {@code e}, or {@code null} if there is no such element @throws ClassCastException if the specified element cannot becompared with the elements currently in the set @throws NullPointerException if the specified element is nulland this set does not permit null elements

        key = new Integer(2).toString();
        keySet = tm.headMap(key, true).navigableKeySet();
        iterator = keySet.iterator();
        iterator.next();// 0
        String expectedLowerKey = (String) iterator.next();// 1
        assertEquals(expectedLowerKey, keySet.lower(iterator.next()));


        try {
            keySet.lower(null);
            fail("should throw NPE");
        } catch (NullPointerException e) {

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        iterator.next();// 0
        String expectedLowerKey = (String) iterator.next();// 1
        assertEquals(expectedLowerKey, keySet.lower(iterator.next()));


        try {
            keySet.lower(null);
            fail("should throw NPE");
        } catch (NullPointerException e) {
            // Expected
        }

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            // Expected
        }


        key = new Integer(0).toString();
        keySet = tm.headMap(key, true).navigableKeySet();
        assertNull(keySet.lower(key));


        key = new Integer(0).toString();
        keySet = tm.headMap(key, false).navigableKeySet();
        assertNull(keySet.lower(key));

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        keySet = tm.headMap(key, true).navigableKeySet();
        assertNull(keySet.lower(key));


        key = new Integer(0).toString();
        keySet = tm.headMap(key, false).navigableKeySet();
        assertNull(keySet.lower(key));


        key = new Integer(999).toString();
        keySet = tm.headMap(key, true).navigableKeySet();
        assertNotNull(keySet.lower(key));

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        keySet = tm.headMap(key, false).navigableKeySet();
        assertNull(keySet.lower(key));


        key = new Integer(999).toString();
        keySet = tm.headMap(key, true).navigableKeySet();
        assertNotNull(keySet.lower(key));


        key = new Integer(999).toString();
        keySet = tm.headMap(key, false).navigableKeySet();
        assertNotNull(keySet.lower(key));
    }

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        keySet = tm.headMap(key, true).navigableKeySet();
        assertNotNull(keySet.lower(key));


        key = new Integer(999).toString();
        keySet = tm.headMap(key, false).navigableKeySet();
        assertNotNull(keySet.lower(key));
    }


    public void test_AscendingSubMapKeySet_higher() {
        NavigableSet keySet;
        Iterator iterator;

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        keySet = navigableMap_startExcluded_endExcluded.navigableKeySet();
        iterator = keySet.iterator();
        while (iterator.hasNext()) {
            key = (String) iterator.next();
            value = Integer.valueOf(key);
            lowerKey = (String) keySet.lower(key);
            if (value > 101) {
                lowerValue = Integer.valueOf(lowerKey);
                assertEquals(value - 1, lowerValue);
            } else {
                assertNull(lowerKey);

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        keySet = navigableMap_startExcluded_endIncluded.navigableKeySet();
        iterator = keySet.iterator();
        while (iterator.hasNext()) {
            key = (String) iterator.next();
            value = Integer.valueOf(key);
            lowerKey = (String) keySet.lower(key);
            if (value > 101) {
                lowerValue = Integer.valueOf(lowerKey);
                assertEquals(value - 1, lowerValue);
            } else {
                assertNull(lowerKey);

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        keySet = navigableMap_startIncluded_endExcluded.navigableKeySet();
        iterator = keySet.iterator();
        while (iterator.hasNext()) {
            key = (String) iterator.next();
            value = Integer.valueOf(key);
            lowerKey = (String) keySet.lower(key);
            if (value > 100) {
                lowerValue = Integer.valueOf(lowerKey);
                assertEquals(value - 1, lowerValue);
            } else {
                assertNull(lowerKey);

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        keySet = navigableMap_startIncluded_endIncluded.navigableKeySet();
        iterator = keySet.iterator();
        while (iterator.hasNext()) {
            key = (String) iterator.next();
            value = Integer.valueOf(key);
            lowerKey = (String) keySet.lower(key);
            if (value > 100) {
                lowerValue = Integer.valueOf(lowerKey);
                assertEquals(value - 1, lowerValue);
            } else {
                assertNull(lowerKey);

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