求助:一个java中的序列化机制
在java中,一个父类(SpuerC)没有实现serivalizable接口,它的子类(SubC)怎么样才能序列化?   
 我的程序如下,运行时产生如下错误:    
java.io.NotSerializableException:   InherSerialTest2.SubC 
 	at   java.io.ObjectOutputStream.writeObject0(Unknown   Source) 
 	at   java.io.ObjectOutputStream.writeObject(Unknown   Source) 
 	at   InherSerialTest2.InherSerialTest2.main(InherSerialTest2.java:21)   
 怎么样才能让SubC能序列化?     
 程序源码如下:   
 SuperC   类:   
 package   InherSerialTest2;   
 public   abstract   class   SuperC   {   
 	int   supervalue;   
 	public   SuperC(int   supervalue)   { 
 		super(); 
 		//   TODO   Auto-generated   constructor   stub 
 		this.supervalue   =   supervalue; 
 	}  	 
 	public   SuperC(){//必须要有无参构造函数  		 
 	}   
 	public   int   getSupervalue()   { 
 		return   supervalue; 
 	}   
 	public   void   setSupervalue(int   supervalue)   { 
 		this.supervalue   =   supervalue; 
 	}   
 	public   String   toString()   { 
 		//   TODO   Auto-generated   method   stub 
 		return    "supervalue   :    "   +   supervalue; 
 	}   
 }     
 SubC   类   
 package   InherSerialTest2;   
 import   
java.io.IOException; 
 import   java.io.ObjectInputStream;   
 import   InherSerialTest.SuperA;   
 public   class   SubC   extends   SuperC   {  	 
 	private   int   subvalue;   
 	public   SubC(int   supervalue,   int   subvalue)   { 
 		super(supervalue); 
 		//   TODO   Auto-generated   constructor   stub 
 		this.subvalue   =   subvalue; 
 	}   
 	public   int   getSubvalue()   { 
 		return   subvalue; 
 	}   
 	public   void   setSubvalue(int   subvalue)   { 
 		this.subvalue   =   subvalue; 
 	}   
 	public   String   toString()   { 
 		//   TODO   Auto-generated   method   stub 
 		return   super.toString()   +    "   ,subvalue   : "   +   subvalue; 
 	}  	 
 	private   void   writeObject(java.io.ObjectOutputStream   oos)throws   
IOException{  		 
 		//先序列化对象 
 		oos.defaultWriteObject(); 
 		//在序列化父类的域 
 		oos.writeInt(supervalue); 
 	}  	 
 	private   void   readObject(ObjectInputStream   ois)throws   IOException,   
ClassNotFoundException{  		 
 		//先反序列化对象 
 		ois.defaultReadObject(); 
 		//再反序列化父类的域 
 		supervalue   =   ois.readInt(); 
 	} 
 }     
 测试程序:   
 package   InherSerialTest2;   
 import   java.io.FileInputStream; 
 import   java.io.FileOutputStream; 
 import   java.io.ObjectInputStream; 
 import   java.io.ObjectOutputStream;   
 public   class   InherSerialTest2   {   
 	/** 
 	   *   @param   args 
 	   */ 
 	public   static   void   main(String[]   args)   { 
 		//   TODO   Auto-generated   method   stub   
 		SubC   sub   =   new   SubC(100,   500);  		 
 		try{ 
 			ObjectOutputStream   oos   =   new   ObjectOutputStream( 
 					new   FileOutputStream( "c:\\InherSerialTest2.txt ")); 
 			oos.writeObject(sub); 
 			oos.close();