how to use bigdecimal in comparator java code example

Example: java bigdecimal compareto

package com.tutorialspoint;

import java.math.*;

public class BigDecimalDemo {

   public static void main(String[] args) {

      // create 2 BigDecimal objects
      BigDecimal bg1, bg2;

      bg1 = new BigDecimal("10");
      bg2 = new BigDecimal("20");

      //create int object
      int res;

      res = bg1.compareTo(bg2); // compare bg1 with bg2

      String str1 = "Both values are equal ";
      String str2 = "First Value is greater ";
      String str3 = "Second value is greater";

      if( res == 0 )
         System.out.println( str1 );
      else if( res == 1 )
         System.out.println( str2 );
      else if( res == -1 )
         System.out.println( str3 );
   }
}