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What output is produced by the program shown in Listing 10 ?
| Listing 10 . Listing for Question 10. |
|---|
public class Ap099{
public static void main(String args[]){new Worker().makeObj();
}//end main()}//end class definition
class Worker{public void makeObj(){
NewClass obj = new NewClass(5);obj.x = 10;
System.out.println(obj.x);}//end makeObj()
}// end classclass NewClass{
private int x = 2;public NewClass(){}//end constructorpublic NewClass(int x){
this.x = x;}//end constructorpublic void setX(int x){
this.x = x;}//end setX()
public int getX(){return x;
}//end getX()}//end NewClass |
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A. Compiler Error
Variables declared private really are private
The code in the following fragment attempts to ignore the setter and getter methods and directly access the private instance variable named x in the object referred to by the reference variable named obj .
obj.x = 10;
System.out.println(obj.x); This produces a compiler error. The compiler error produced by JDK 1.3 is reproduced below.
Ap099.java:19: x has private access in
NewClassobj.x = 10;
^Ap099.java:20: x has private access in
NewClassSystem.out.println(obj.x);
^ 
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