Examples of java.util.NavigableSet.floor()

java.util.NavigableSet.floor()
Returns the greatest element in this set less than or equal to the given element, or {@code null} if there is no such element. @param e the value to match @return the greatest element less than or equal to {@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 iterator = keySet.iterator();
        iterator.next();
        assertEquals(new Integer(1).toString(), keySet.floor(iterator.next()));


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

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            // Expected
        }


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


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

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        keySet = tm.headMap(key, true).navigableKeySet();
        assertEquals(key, keySet.floor(key));


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


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

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


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


        key = new Integer(999).toString();
        keySet = tm.headMap(key, false).navigableKeySet();
        assertEquals(new Integer(998).toString(), keySet.floor(key));
    }

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