Perform Basic Operation on Hashtable

package com.JavaInterview.Programs;

import java.util.Hashtable;

import java.util.Set;

/**

 * Perform Basic Operation on Hashtable

 * 

 * @author:http://javainterviewprograms.blogspot.in/

 * 

 */

public class HashTableBasicJIP {

 public static void main(String args[]) {

  // Create Hashtable Instance

  Hashtable<Integer, String> JipHT = new Hashtable<Integer, String>();

  // Adding element to Hashtable

  JipHT.put(1, "first");

  JipHT.put(2, "second");

  JipHT.put(3, "third");

  // Print the Hashtable

  System.out.println("Original Hashtable :"+JipHT);

  // Adding element by duplicate key

  JipHT.put(2, "six");

  System.out.println("Hashtable post duplicate key" + JipHT);

  // Adding element by duplicate value

  JipHT.put(33, "third");

  System.out.println("Hashtable post duplicate value" + JipHT);

  // getting value for given key

  System.out.println("value for the key '1'" + JipHT.get(1));

  // Check if Hashtable is empty

  System.out.println("Is Hashtable empty:" + JipHT.isEmpty());

  // Remove element from Hashtable

  JipHT.remove(1);

  System.out.println("Hashtable post removal of its elemnet " + JipHT);

  // Size of the Hashtable

  System.out.println("Size of Hashtable:" + JipHT.size());

  //Iterate through the Hashtable

  Set<Integer> keys=JipHT.keySet();

  for(Integer key:keys)

  {

   System.out.println("Value of "+key +" is "+JipHT.get(key));

  }

 }

}

Output:

Original Hashtable :{3=third, 2=second, 1=first}

Hashtable post duplicate key{3=third, 2=six, 1=first}

Hashtable post duplicate value{3=third, 2=six, 1=first, 33=third}

value for the key '1'first

Is Hashtable empty:false

Hashtable post removal of its elemnet {3=third, 2=six, 33=third}

Size of Hashtable:3

Value of 3 is third

Value of 2 is six

Value of 33 is third