how to use pop function that is void java code example

Example: java stack pop

package com.tutorialspoint;

import java.util.*;

public class StackDemo {
   public static void main(String args[]) {

      // creating stack
      Stack st = new Stack();

      // populating stack
      st.push("Java");
      st.push("Source");
      st.push("code");

      // removing top object
      System.out.println("Removed object is: "+st.pop());

      // elements after remove
      System.out.println("Elements after remove: "+st);
   }    
}