Program: How to search a key in Hashtable?

Below example shows how to search a key from the Hashtable. The method containsKey() helps us to find whether the specified key exists or not.

package com.java2novice.hashtable;

import java.util.Hashtable;

public class MyHashtableKeySearch {

	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(hm);
		if(hm.containsKey("first")){
			System.out.println("The Hashtable contains key first");
		} else {
			System.out.println("The Hashtable does not contains key first");
		}
		if(hm.containsKey("fifth")){
			System.out.println("The Hashtable contains key fifth");
		} else {
			System.out.println("The Hashtable does not contains key fifth");
		}
	}
}

{third=THIRD INSERTED, second=SECOND INSERTED, first=FIRST INSERTED}
The Hashtable contains key first
The Hashtable does not contains key fifth