Question

How to check if an HashSet is empty in Java

Answer 1

package javaapplication1;

import java.util.HashSet;

public class JavaApplication1 {

    public static void main(String[] args) {

        HashSet hash = new HashSet();
   
        hash.add(new Integer("1"));
        hash.add(new Integer("2"));
        hash.add(new Integer("3"));
        hash.add(new Integer("4"));
        hash.add(new Integer("5"));
        hash.add(new Integer("6"));
        hash.add(new Integer("7"));

        if (hash.isEmpty())     
            System.out.println("Empty");     
        else
            System.out.println("Not Empty");     
  }
}
  
/*
run:

Not Empty

*/

 

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