Java序列化中子类、父类构造函数问题实例分析

package com.imooc.io;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class ObjectSeriaDemo2 {
  public static void main(String[] args) throws Exception{
     ObjectOutputStream oos = new ObjectOutputStream(
         new FileOutputStream("demo/obj1.dat"));
     Foo2 foo1 = new Foo2();  //创建对象的时候，递归调用了父类的构造函数
     oos.writeObject(foo1);
     oos.flush();
     oos.close();
     //反序列化是否递归调用父类的构造函数，不能证明
     ObjectInputStream ois = new ObjectInputStream(
         new FileInputStream("demo/obj1.dat"));
     Foo2 foo2 = (Foo2)ois.readObject();
     System.out.println(foo2);
     ois.close();
     ObjectOutputStream oos1 = new ObjectOutputStream(
         new FileOutputStream("demo/obj1.dat"));
     Bar2 bar1 = new Bar2();
     oos1.writeObject(bar1);
     oos1.flush();
     oos1.close();
     ObjectInputStream ois1 = new ObjectInputStream(
         new FileInputStream("demo/obj1.dat"));
     Bar2 bar2 = (Bar2)ois1.readObject();
     System.out.println(bar2);
     ois1.close();
     /*
     * 对子类对象进行反序列化操作时，
     * 如果其父类没有实现序列化接口
     * 那么其父类的构造函数会被调用
     */
  }
}
/*
 *  一个类实现了序列化接口，那么其子类都可以进行序列化
 */
class Foo implements Serializable{
  public Foo(){
     System.out.println("foo...");
  }
}
class Foo1 extends Foo{
  public Foo1(){
     System.out.println("foo1...");
  }
}
class Foo2 extends Foo1{
  public Foo2(){
     System.out.println("foo2...");
  }
}
class Bar{
  public Bar(){
     System.out.println("bar");
  }
}
class Bar1 extends Bar{
  public Bar1(){
     System.out.println("bar1..");
  }
}
class Bar2 extends Bar1 implements Serializable{
  public Bar2(){
     System.out.println("bar2...");
  }
}