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单项选择题

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( ObjectOutputStream 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();

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