TreeMap lowerKey(K key) method in java
example on TreeMap lowerKey(K key) method for NullPointerException
import java.util.TreeMap;
public class TreeMapLowerKeyMethodExample
{
public static void main(String[] args)
{
TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
tm.put(8, "mango");
tm.put(5, "apple");
tm.put(3, "watermelon");
tm.put(7, "pineapple");
tm.put(6, "orange");
tm.put(9, "grapes");
System.out.println("TreeMap: " + tm.toString());
try
{
// pass null as parameter to lowerKey() method
System.out.println(tm.lowerKey(null));
}
catch(Exception ex)
{
System.out.println("Exception: " + ex);
}
}
}