treemap lowerkey 28k key 29 method in java

1import java.util.Map;
2import java.util.TreeMap;
3public class TreeMapLowerEntryMethodExample
4{
5   public static void main(String[] args)
6   {
7      try
8      {
9         TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
10         tm.put(7, "red");
11         tm.put(3, "green");
12         tm.put(6, "violet");
13         tm.put(5, "blue");
14         tm.put(4, "yellow");
15         System.out.println("Given TreeMap: " + tm);
16         // get lowerEntry value for null using lowerEntry() method
17         System.out.println("Get lowerEntry value for value null: ");
18         Map.Entry<Integer, String> value = tm.lowerEntry(null);
19         System.out.println("Value is: " + value);
20      }
21      catch(NullPointerException ex)
22      {
23         System.out.println("Exception : " + ex);
24      }
25   }
26}

1example on TreeMap lowerKey(K key) method for NullPointerException
2import java.util.TreeMap;
3public class TreeMapLowerKeyMethodExample
4{
5   public static void main(String[] args)
6   {
7      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
8      tm.put(8, "mango");
9      tm.put(5, "apple");
10      tm.put(3, "watermelon");
11      tm.put(7, "pineapple");
12      tm.put(6, "orange");
13      tm.put(9, "grapes");
14      System.out.println("TreeMap: " + tm.toString());
15      try
16      {
17         // pass null as parameter to lowerKey() method
18         System.out.println(tm.lowerKey(null));
19      }
20      catch(Exception ex)
21      {
22         System.out.println("Exception: " + ex);
23      }
24   }
25}

1import java.util.TreeMap;
2public class TreeMapLowerEntryMethodExample
3{
4   public static void main(String[] args)
5   {
6      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
7      tm.put(7, "red");
8      tm.put(3, "green");
9      tm.put(6, "violet");
10      tm.put(5, "blue");
11      tm.put(4, "yellow");
12      // get lower entry
13      System.out.println("Check lower entry in given TreeMap");
14      System.out.println("Value is: "+ tm.lowerEntry(5));
15   }
16}

1import java.util.TreeMap;
2public class TreeMapLowerKeyMethodExample
3{
4   public static void main(String[] args)
5   {
6      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
7      tm.put(8, "mango");
8      tm.put(5, "apple");
9      tm.put(3, "watermelon");
10      tm.put(7, "pineapple");
11      tm.put(6, "orange");
12      tm.put(9, "grapes");
13      System.out.println("TreeMap: " + tm.toString());
14      // here 10 is not available it returns 9
15      System.out.print("Lower Key Entry of Element 10 is: ");
16      System.out.println(tm.lowerKey(10));
17      System.out.print("Lower Key Entry of Element 5 is: ");
18      System.out.println(tm.lowerKey(5));
19   }
20}