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Externalizable的用法


package com.itbuluoge.object;

import java.io.Externalizable;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

class Moon implements Externalizable{

public Moon()
{
System.out.println("moon");
}
public void readExternal(ObjectInput arg0) throws IOException,
ClassNotFoundException {
// TODO Auto-generated method stub
System.out.println("reading moon!");
}

public void writeExternal(ObjectOutput arg0) throws IOException {
// TODO Auto-generated method stub
System.out.println("writing moon!");
}

}
class Sun implements Externalizable
{
Sun()
{
System.out.println("sun");
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
// TODO Auto-generated method stub

}

public void writeExternal(ObjectOutput out) throws IOException {
// TODO Auto-generated method stub

}

}

public class Stars
{
public static void main(String[] args) throws Exception, IOException
{
Moon moon=new Moon();
Sun sun=new Sun();

ObjectOutputStream o=new ObjectOutputStream(new FileOutputStream("star.out"));
o.writeObject(moon);
o.writeObject(sun);
o.close();

ObjectInputStream in=new ObjectInputStream(new FileInputStream("star.out"));
moon=(Moon)in.readObject();
sun=(Sun)in.readObject();
in.close();

}
}



我们可以看到输出结果

Externalizable的用法_java


我们对moon的写和读序列化都没有问题,但是对sun的写没有问题,但是在读出的时候,抛出异常,因为实现了Externalizable接口的类,会调用构造函数,而sun的构造函数是私有的,无法访问,从而导致抛出异常。

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