Program: How to delete all elements from Hashtable?

Below example shows how to delete all key-values at one call from Hashtable. By calling clear() method, we can remove all elements from Hashtable at once.

package com.java2novice.hashtable;

import java.util.Hashtable;

public class MyHashtableClear {

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

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