Monday, 2 March 2015

Java : Collection Framework : Hashtable (ContainsKey)


Click here to watch in Youtube : 
https://www.youtube.com/watch?v=GvEK-NrsqAY&list=UUhwKlOVR041tngjerWxVccw

HashtableExample.java
import java.util.Hashtable;

/*
 * Example of containsKey(Object key) 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");
        /*
         * Returns true if this map contains a mapping for the specified key.
         */
        boolean isKeyExist = hashtable.containsKey("BE");

        System.out.println("isKey 'BE' Exist : " + isKeyExist);

        isKeyExist = hashtable.containsKey("EG");

        System.out.println("isKey 'EG' Exist : " + isKeyExist);

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

isKey 'BE' Exist : true
isKey 'EG' Exist : false
To Download HashtableDemoContainsKey Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/HashtableDemoContainsKey.zip?attredirects=0&d=1

See also:
  • All JavaEE Viedos Playlist
  • All JavaEE Viedos
  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
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