SCJP題庫第146題

Given:

1. import java.io.*;

2. public class Foo implements Serializable{

3.   public int x, y;

4.   public Foo(int x, int y){this.x = x; this.y = y;}

5.

6.   private void writeObject(ObjctOutputStream s)

7.   throws IOException{

8.     s.writeInt(x); s.writeInt(y);

9.   }

10.

11. private void readObject(ObjectInputStream s)

12. throws IOException, ClassNotFoundException{

13.

14.   //insert code here

15.

16. }

17.}

Which code, inserted at line 14, will allow this class to correctly serialize and deserialize?

A. s.defaultReadObject();

B. this = s.defaultReadObject(),

C. y = s.readInt(); x = s.readInt();

D. x = s.readInt(); y = s.readInt();

 

Ans: D

 

解說:

寫入串流與讀出串流的順序要一致