Program: How to delete all elements from TreeMap?

Below example shows how to delete all elements from the given TreeMap at one call. By calling clear() method, we can delete all key-value pairs from TreeMap.

package com.java2novice.treemap;

import java.util.TreeMap;

public class MyTreeMapClear {

	public static void main(String a[]){
		TreeMap<String, String> hm = new TreeMap<String, String>();
		//add key-value pair to TreeMap
		hm.put("first", "FIRST INSERTED");
		hm.put("second", "SECOND INSERTED");
		hm.put("third","THIRD INSERTED");
		System.out.println("My TreeMap content:");
		System.out.println(hm);
		System.out.println("Clearing TreeMap:");
		hm.clear();
		System.out.println("Content After clear:");
		System.out.println(hm);
	}
}

My TreeMap content:
{first=FIRST INSERTED, second=SECOND INSERTED, third=THIRD INSERTED}
Clearing TreeMap:
Content After clear:
{}