treemap ceilingkey 28 29 method in java

1example of TreeMap ceilingKey(K key) method when it returns null
2import java.util.NavigableMap;
3import java.util.TreeMap;
4public class TreeMapCeilingkeyDemo
5{
6   public static void main(String[] args)
7   {
8      NavigableMap<Integer, String> nm = new TreeMap<Integer, String>();
9      nm.put(10, "apple");
10      nm.put(20, "banana");
11      nm.put(30, "cherry");
12      nm.put(40, "fig");
13      nm.put(60, "grape");
14      nm.put(70, "kiwifruit");
15      // 200 is not present in map
16      // or any key greater than 200
17      // hence returns null
18      System.out.println("Ceiling key for 200: " + nm.ceilingKey(200));
19   }
20}

1import java.util.NavigableMap;
2import java.util.TreeMap;
3public class TreeMapCeilingkeyDemo
4{
5   public static void main(String[] args)
6   {
7      NavigableMap<Integer, String> nm = new TreeMap<Integer, String>();
8      nm.put(10, "apple");
9      nm.put(20, "banana");
10      nm.put(30, "cherry");
11      nm.put(40, "fig");
12      nm.put(60, "grape");
13      nm.put(70, "kiwifruit");
14      // 60 is least value > 50
15      // it is returned as key.
16      System.out.println("Ceiling key for 50: " + nm.ceilingKey(50));
17   }
18}

1example on TreeMap ceilingKey(K key) method when it returns ClassCastException
2import java.util.NavigableMap;
3import java.util.TreeMap;
4public class TreeMapCeilingkeyDemo
5{
6   public static void main(String[] args)
7   {
8      NavigableMap<Object, String> tm = new TreeMap<Object, String>();
9      tm.put(10, "apple");
10      tm.put(20, "banana");
11      tm.put(30, "cherry");
12      tm.put(40, "fig");
13      tm.put(60, "grape");
14      tm.put(70, "kiwifruit");
15      try
16      {
17         // returns ClassCastException
18         // we cannot compare String object with an Integer object
19         System.out.println("Ceiling key entry for \"asd\": " + tm.ceilingKey(new String("mango")));
20      }
21      catch(Exception ex)
22      {
23         System.out.println("Exception: " + ex);
24      }
25   }
26}