檢視 SCJP 1.6版考題 146 的原始碼

 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();

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<span style="font-size:medium;">解答</span>

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<span style="font-size: medium;">Ans: D   </span>

<span style="font-size:medium;"> 解說:
寫入串流與讀出串流的順序要一致

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{{SCJP 1.6版考題講解}}