What is the output of this program?import java.util.*;

Home » JAVA Programming » Collections » Question

What is the output of this program?

import java.util.*;
    public class properties_Example
    {
        public static void main(String args[]) 
        {
            Properties object = new Properties();
            object.put("PQ", new Integer(23));
            object.put("SR", new Integer(46));
            object.put("UV", new Integer(25));
            System.out.print(object.keySet());
        }
    }

1. [PQ, UV, SR]
2. [PQ, UV]
3. [UV, SR]
4. [23, 46, 25]
5. None of these

Correct Option: A

object.keySet() returns a set containing all the keys used in properties object, here object contains keys PQ, SR, UV therefore object.keySet() returns [PQ, SR, UV].