test12.java

SCJP认证考试资料

import java.io.*;
class B{
    int i = 2;
    B(int i) {
	this.i = i;
    }
    B() {
    }
}
class A extends B implements Serializable {
    int x = 5;
    A(int x) {
	super(x);
	this.x = x;
    }
}

class Test12{
    public static void main(String[] args) throws Exception{

	File f = new File("a.txt");
	ObjectOutputStream oos = new ObjectOutputStream(
				      new FileOutputStream(f));
	
	
	oos.writeObject(new A(5));
	oos.close();
       
	ObjectInputStream ois = new ObjectInputStream(
						      new FileInputStream(f));
	
	A obj = (A)ois.readObject();
	System.out.println(obj.i);
	ois.close();
	
	}
}