Program: How to delete all elements from HashMap?

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

package com.java2novice.hashmap;

import java.util.HashMap;

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

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