java中比较double大小

 Double obj1 = new Double("8.5");     Double obj2 = new Double("11.50");     int retval =  obj1.compareTo(obj2);         if(retval > 0) {        System.out.println("obj1 is greater than obj2");     }     else if(retval < 0) {        System.out.println("obj1 is less than obj2");     }     else {        System.out.println("obj1 is equal to obj2");     }