Hashtable Class Java Example

Hashtable Class

Hashtable is similar to HashMap which can store elements in the form of key-value pairs.But Hashtable is synchronized .So in case of multi-threaded environment will get reliable result.

Default Initial Capacity= 11
Load Factor=0.75

Hashtable Class Methods

• value put(key,value)
• value get(Object key)
• Set<K> keySet()
• Collection<V> values
• value remove(Object key)
• void clear()
• boolean isEmpty()
• int size()

Program Sample:

/**

 * 

 */

package com.collectionpack;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.Enumeration;

import java.util.Hashtable;

/**

 * @author Abhinaw.Tripathi

 *

 */

public class HashtableDemo

{

/**

* @param args

* @throws IOException 

*/

public static void main(String[] args) throws IOException

{

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

ht.put("Ajay", 50);

ht.put("Abhinaw", 100);

ht.put("Kapil", 88);

ht.put("Dhoni", 555);

ht.put("Tendulkar", 80);

System.out.println("The Player Names:");

Enumeration enuum=ht.keys();

while(enuum.hasMoreElements())

{

System.out.println(enuum.nextElement());

}

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter Player Name:");

String name=br.readLine();

name=name.trim();

Integer score=ht.get(name);

if(score!=null)

{

int sc=score.intValue();

System.out.println(name + "Scored : " +sc);

}

else

System.out.println("Player not found");

}

}

OutPut:

The Player Names:

Ajay

Tendulkar

Dhoni

Abhinaw

Kapil

Enter Player Name:

Kapil

KapilScored : 88