Convertir chaine en double et puis comparaison

double value;
String ch=object.toString().substring(1, 6);
    double obj =Integer.valueOf(ch).doubleValue();
pour la comparaison:
 int x =  obj.compareTo(value);
 if(x > 0) {
        System.out.println("obj is greater than value");
     }
     else if(xretval < 0) {
        System.out.println("obj is less than value");
     }
     else {
        System.out.println("obj is equal to value");
     }