Examples of java.util.TreeMap.ceilingKey()

        assertEquals(tm.lastKey(), treeMap.lastKey());
        assertEquals(tm.lastEntry(), treeMap.lastEntry());
        assertEquals(tm.keySet(), treeMap.keySet());


        String key = new Integer(100).toString();
        assertEquals(tm.ceilingKey(key), treeMap.ceilingKey(key));
        assertEquals(tm.ceilingEntry(key), treeMap.ceilingEntry(key));
        assertEquals(tm.floorKey(key), treeMap.floorKey(key));
        assertEquals(tm.floorEntry(key), treeMap.floorEntry(key));
        assertEquals(tm.lowerKey(key), treeMap.lowerKey(key));
        assertEquals(tm.lowerEntry(key), treeMap.lowerEntry(key));

            // Expected
        }
        assertNull(treeMap.lastEntry());


        try {
            treeMap.ceilingKey(1);
        } catch (NoSuchElementException e) {
            // Expected
        }
        assertNull(treeMap.ceilingEntry(1));

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