Java : Collection Framework : HashMap (isEmpty)

Click here to watch in Youtube : 
https://www.youtube.com/watch?v=MgVaU38yUMg&list=UUhwKlOVR041tngjerWxVccw

HashMapExample.java

import java.util.HashMap;

/*
 * Example of isEmpty() method.
 */
public class HashMapExample
{
    public static void main( String[] args )
    {

        HashMap<Integer, String> hashMap = new HashMap<Integer, String>();

        System.out.println("hashMap : " + hashMap );

        /*
         * Returns true if this map contains no key-value mappings.
         */
        boolean isEmpty = hashMap.isEmpty();

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

        hashMap.put(1, "Apple");
        hashMap.put(2, "Ball");
        hashMap.put(3, "Cat");

        System.out.println("hashMap : " + hashMap );

        isEmpty = hashMap.isEmpty();

        System.out.println("isEmpty : " + isEmpty);

    }
}

Output

hashMap : {}
isEmpty : true

hashMap : {1=Apple, 2=Ball, 3=Cat}
isEmpty : false

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

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial