Java HashSet Remove All Elements

Chapter: Collections Last Updated: 10-05-2016 19:48:18 UTC

Program:

            /* ............... START ............... */
                
import java.util.HashSet;

public class JavaHashSetRemoveAllElements {

	public static void main(String[] args) {

		// create object of HashSet
		HashSet hashSet = new HashSet();

		// add elements to HashSet object
		hashSet.add(new Integer("1"));
		hashSet.add(new Integer("2"));
		hashSet.add(new Integer("3"));

		System.out.println("HashSet before removal : " + hashSet);

		hashSet.clear();
		System.out.println("HashSet after removal : " + hashSet);

		System.out.println("Is HashSet empty ? " + hashSet.isEmpty());

	}
}
                /* ............... END ............... */
        

Output

HashSet before removal : [1, 2, 3]
HashSet after removal : []
Is HashSet empty ? true

Tags

Collection, HashSet Remove All Elements, Java

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