Examples of java.util.SortedMap.headMap()

java.util.SortedMap.headMap()
Returns a view of the portion of this map whose keys are strictly less than toKey. 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 toKey high endpoint (exclusive) of the keys in the returned map @return a view of the portion of this map whose keys are strictlyless than toKey @throws ClassCastException if toKey is not compatiblewith this map's comparator (or, if the map has no comparator, if toKey does not implement {@link Comparable}). Implementations may, but are not required to, throw this exception if toKey cannot be compared to keys currently in the map. @throws NullPointerException if toKey is null andthis map does not permit null keys @throws IllegalArgumentException if this map itself has arestricted range, and toKey lies outside the bounds of the range

        map.get("B"); // Entry with value "One" created
        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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        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",

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        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",

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      if (localSortedMap != null)
      {
        if (this.lowerBound != null)
          localSortedMap = localSortedMap.tailMap(this.lowerBound);
        if (this.upperBound != null)
          localSortedMap = localSortedMap.headMap(this.upperBound);
        return localSortedMap;
      }
      return null;
    }

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