Java : Collection Framework : HashSet (Check object exists or not)

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HashSetExample.java

import java.util.HashSet;

/*
 * Example of contains(Object o) method.
 */
public class HashSetExample
{
    public static void main( String[] args )
    {
        HashSet<String> hashSet = new HashSet<String>();

        hashSet.add("Dave");
        hashSet.add("Peter");
        hashSet.add("Phil");
        hashSet.add("Rohit");
        hashSet.add("Virat");

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

        /*
         * Returns true if this set contains the specified element.
         */
        boolean isExist = hashSet.contains("Peter");
        System.out.println("is 'Peter' Exist : " + isExist);
        
        isExist = hashSet.contains("Juli");
        System.out.println("is 'Juli' Exist : " + isExist);

    }
}

Output

hashSet: [Rohit, Dave, Phil, Peter, Virat]

is 'Peter' Exist : true
is 'Juli' Exist : false

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

See also:

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