Java : Collection Framework : Hashtable (Contains)

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HashtableExample.java

import java.util.Hashtable;

/*
 * Example of contains(Object value) method.
 */
public class HashtableExample
{
    public static void main( String[] args )
    {

        Hashtable<String, String> hashtable = new Hashtable<String, String>();

        /*
         * Key = CountryCode,Value = CountryName
         */
        hashtable.put("AF", "AFGHANISTAN");
        hashtable.put("BE", "BELGIUM");
        hashtable.put("US", "UNITED STATES");
        hashtable.put("IN", "INDIA");

        System.out.println("hashtable : " + hashtable + "\n");

        /*
         * Tests if some key maps into the specified value in this hashtable.
         * 
         * This operation is more expensive than the containsKey method. Note
         * that this method is identical in functionality to containsValue,
         * (which is part of the Map interface in the collections framework).
         */
        boolean isValueExist = hashtable.contains("BELGIUM");

        System.out.println("isValue 'BELGIUM' Exist : " + isValueExist);

        isValueExist = hashtable.contains("PAKISTAN");

        System.out.println("isValue 'PAKISTAN' Exist : " + isValueExist);

    }
}

Output

hashtable : {IN=INDIA, AF=AFGHANISTAN, BE=BELGIUM, US=UNITED STATES}

isValue 'BELGIUM' Exist : true
isValue 'PAKISTAN' Exist : false

To Download HashtableDemoContains Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/HashtableDemoContains.zip?attredirects=0&d=1

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