Java.lang.Character.Subset Class in Java

// Java Program illustrating the use of Character.Subset class Methods.

import java.lang.*;

public class CharacterSubsetDemo extends Character.Subset 
{
   CharacterSubsetDemo(String s) 
   {
      // Use of super keyword : 
      // Invokes immediate parent class constructor.
      super(s); 
   }

   public static void main(String[] args) 
   {
      // Initializing two Subsets.
      CharacterSubsetDemo a = new CharacterSubsetDemo("geeks");
      CharacterSubsetDemo b = new CharacterSubsetDemo("for");

      // use of equals() : 
      boolean check2 = a.equals(a);
      System.out.println("Is a equals a ? : " + check2);
      check2 = b.equals(a);
      System.out.println("Is b equals a ? : " + check2);
      System.out.println();
      
      // Use of hashCode() : 
      int check1 = a.hashCode();
      System.out.println("hashCode " + a + " : " + check1);
      check1 = b.hashCode();
      System.out.println("hashCode " + b + " : " + check1);
      System.out.println();
      
      // Use of toString() : 
      System.out.println("a : " + a.toString());
      System.out.println("b : " + b.toString());
   }
}