Given:

1 class TestObj{

2 int x;

3 TestObj updateObject(){

4 ________(X)_________

5 x=900;

6 return obj;

7 }

8 int receiveObject(TestObj obj){

9 x=100;

10 return x;

11 }

12 public String toString(){

13 return "Answer=" + x ;

14 }

15}

16 class TestRetObject {

17 public static void main(String[] args) {

18 TestObj obj= new TestObj();

19 obj.updateObject();

20 System.out.println(obj);

21 obj.receiveObject(obj);

22 System.out.println(obj);

23 }

(a) Which line number shows calling a method bypassing an object?

(b) Which line number shows calling a method that returns an object?

(c) Write a statement in (X) to complete method updateObject().

(d) What will be printed by line 20 and 22 if toString() method line 12-14 are commented?

oop java