Java - Delete all elements from a TreeMap

The method clear() is used to remove any element in the map structure in Java. After calling this method, the list TreeMap becomes empty.

package codeurjava. TreeMap; 

import java.util.TreeMap; 

public class TreeMapCopy {
 
 public static void main(String a[]){
 TreeMap hmap = new TreeMap(); 
 //add key-value peers
 hmap.put(1, "one"); 
 hmap.put(2, "two"); 
 hmap.put(3,"three"); 
 hmap.put(4,"four"); 
 hmap.put(5,"five"); 
 hmap.put(6,"six"); 
 
 System.out.println("TreeMap before: "+hmap); 
 
 System.out.println("Empty TreeMap"); 
 hmap.clear(); 
 
 System.out.println("TreeMap after: "+hmap); 
 }
}

Runtime:

TreeMap before: {1=one, 2=two, 3=three, 4=four, 5=five, 6=six}
Empty TreeMap
TreeMap after: {}