import java.io.*; 
  
 public class ObjectTest implements Serializable { 
 	static private int a;            //问题1：static 和 transient的字段不是不能序列化的吗？（这在jdk ObjectOutputStream类中有说过） 
 	static String s; 
 	 
 //	public ObjectTest(){System.out.println("Constructor");}  //问题2：我把默认的构造器注释起来居然也能运行（这在jdk Serializable接口中有说过） 
 	public ObjectTest(int a, String s){ 
 		this.a = a; 
 		this.s = s; 
 	} 
 	 
 //	private void writeObject(java.io.ObjectOutputStream out)throws IOException{ 
 //		out.writeInt(a); 
 //		out.writeObject(s); 
 //	} 
 //	 
 //	private void readObject(java.io.ObjectInputStream in)throws IOException,ClassNotFoundException{ 
 //		a = in.readInt(); 
 //		s = (String)in.readObject(); 
 //	} 
 	 
 	public String toString(){ 
 		return "a = " + a + ",  s = " + s; 
 	} 
 	public static void main(String[] args)throws IOException, ClassNotFoundException{ 
 		ObjectTest ot = new ObjectTest(1, "a"); 
 		System.out.println("Test one:"); 
 		System.out.println(ot); 
 		 
 		BufferedOutputStream bos = new BufferedOutputStream( 
 				new FileOutputStream("D:\\333\\OOO.test")); 
 		ObjectOutputStream oos = new ObjectOutputStream(bos); 
 		oos.writeObject(ot); 
 		oos.close(); 
 		 
 		BufferedInputStream bis = new BufferedInputStream( 
 				new FileInputStream("D:\\333\\OOO.test")); 
 		ObjectInputStream ois = new ObjectInputStream(bis); 
 		ObjectTest ot2 = (ObjectTest)ois.readObject(); 
 		ois.close(); 
 		 
 		System.out.println("Test two:"); 
 		System.out.println(ot2); 
 	} 
 } 
 

import java.io.*;
import java.util.*;

public class Test implements Serializable
{
    public transient int a;
    
    public Test(){ }
    
    public static void main(String[] args)
    {
        Test t = new Test();
        t.a = 10;
        System.out.println("t.a = " + t.a);
        
        try
        {
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("t.dat"));
            out.writeObject(t);
            out.close();
            
            ObjectInputStream in = new ObjectInputStream(new FileInputStream("t.dat"));
            Test nt = (Test)in.readObject();
            in.close();
            
            System.out.println("nt.a = " + nt.a);
        }
        catch(Exception e){e.printStackTrace();}
    }
}

------解决方案--------------------
第一个问题。static 和 transient的字段事实上并没有序列化。
反序列化输出的是类的值。
如果该成这样
Java code

oos.close();
[color=#FF0000]ObjectTest.a=2;[/color]   
BufferedInputStream bis = new BufferedInputStream(
              new FileInputStream("D:\\333\\OOO.test"));

------解决方案--------------------
static的数据没有被序列化。之所以你的测试看起来好像是被序列化了，原因是static的数据在内存中使用都是只有一份，你把代码改称下面这样子

  public static void main(String[] args)throws IOException, ClassNotFoundException{
       ObjectTest ot = new ObjectTest(1, "a");
       System.out.println("Test one:");
       System.out.println(ot);
      
       BufferedOutputStream bos = new BufferedOutputStream(
               new FileOutputStream("D:\\333\\OOO.test"));
       ObjectOutputStream oos = new ObjectOutputStream(bos);