試題詳解

 1. public class Target{

 2. private int i = 0；

 3. public int addOne(){

 4. return ++i； 

5. }

 6. }

 And: 

1. public class Client{ 

2. public static void main(String[] args){

 3. System.out.println(new Target().addOne())； 

4. } 

5. } Which change can you make to Target without affecting Client?
(A) Line 4 of class Target can be changed to return i++；
(B) Line 2 of class Target can be changed to private int i = 1；
(C) Line 3 of class Target can be changed to private int addOne(){
(D) Line 2 of class Target can be changed to private Integer i = 0；