Comparing two strings in a java pgm

Comparing two strings

public class StringCompareEmp

{

   public static void main(String args[])

   {

      String str = "Hello World";

      String anotherString = "hello world";

      Object objStr = str;

      System.out.println( str.compareTo(anotherString) );

      System.out.println( str.compareToIgnoreCase(anotherString) );

      System.out.println( str.compareTo(objStr.toString()));

   }

}