Examples of java.util.SortedMap.subMap()

java.util.SortedMap.subMap()
Returns a view of the portion of this map whose keys range from fromKey, inclusive, to toKey, exclusive. (If fromKey and toKey are equal, the returned map is empty.) The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.
The returned map will throw an IllegalArgumentException on an attempt to insert a key outside its range. @param fromKey low endpoint (inclusive) of the keys in the returned map @param toKey high endpoint (exclusive) of the keys in the returned map @return a view of the portion of this map whose keys range fromfromKey, inclusive, to toKey, exclusive @throws ClassCastException if fromKey and toKeycannot be compared to one another using this map's comparator (or, if the map has no comparator, using natural ordering). Implementations may, but are not required to, throw this exception if fromKey or toKey cannot be compared to keys currently in the map. @throws NullPointerException if fromKey or toKeyis null and this map does not permit null keys @throws IllegalArgumentException if fromKey is greater thantoKey; or if this map itself has a restricted range, and fromKey or toKey lies outside the bounds of the range

        map.put("C", "c");
        assertEquals("First key should be A", map.firstKey(), "A");
        assertEquals("Last key should be C", map.lastKey(), "C");
        assertEquals("First key in tail map should be B", map.tailMap("B").firstKey(), "B");
        assertEquals("Last key in head map should be B", map.headMap("C").lastKey(), "B");
        assertEquals("Last key in submap should be B", map.subMap("A", "C").lastKey(), "B");


        Comparator c = map.comparator();
        assertTrue("natural order, so comparator should be null", c == null);
    }

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        assertFalse(s.containsKey(null));
        // RI fails here
        // assertTrue(s.containsKey("1st"));
        // assertTrue(s.containsKey("2nd"));
        s = tm.descendingMap();
        s = s.subMap("3rd", null);
        // assertEquals(4, s.size());
//        assertTrue(s.containsValue(-1));
//        assertTrue(s.containsValue(1));
//        assertTrue(s.containsValue(2));
//        assertTrue(s.containsValue(3));

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        assertEquals("First key in tail map should be B", 
            map.tailMap("B").firstKey(), "B");
        assertEquals("Last key in head map should be B", 
            map.headMap("C").lastKey(), "B");
        assertEquals("Last key in submap should be B",
           map.subMap("A","C").lastKey(), "B");
        
        Comparator c = map.comparator();
        assertTrue("natural order, so comparator should be null", 
            c == null);      
    }

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        assertEquals("First key in tail map should be B", 
            map.tailMap("B").firstKey(), "B");
        assertEquals("Last key in head map should be B", 
            map.headMap("C").lastKey(), "B");
        assertEquals("Last key in submap should be B",
           map.subMap("A","C").lastKey(), "B");
        
        Comparator c = map.comparator();
        assertTrue("natural order, so comparator should be null", 
            c == null);
    }

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