/**

     * The number of times this HashMap has been structurally modified

     * Structural modifications are those that change the number of mappings in

     * the HashMap or otherwise modify its internal structure (e.g.,

     * rehash).  This field is used to make iterators on Collection-views of

     * the HashMap fail-fast.  (See ConcurrentModificationException).

     */

    transient int modCount;

package tmp;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

class Rectangle implements Serializable{

    /**

     *

     */

    private static final long serialVersionUID = 1710022455003682613L;

    private Integer width;

    private Integer height;

    private transient Integer area;

    public Rectangle (Integer width, Integer height){

        this.width = width;

        this.height = height;

        this.area = width * height;

    }

    public void setArea(){

        this.area = this.width * this.height;

    }

    @Override

    public String toString(){

        StringBuffer sb = new StringBuffer(40);

        sb.append("width : ");

        sb.append(this.width);

        sb.append("\nheight : ");

        sb.append(this.height);

        sb.append("\narea : ");

        sb.append(this.area);

        return sb.toString();

    }

}

public class TransientExample{

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

        Rectangle rectangle = new Rectangle(3,4);

        System.out.println("1.原始对象\n"+rectangle);

        ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("rectangle"));

        // 往流写入对象

        o.writeObject(rectangle);

        o.close();

        // 从流读取对象

        ObjectInputStream in = new ObjectInputStream(new FileInputStream("rectangle"));

        Rectangle rectangle1 = (Rectangle)in.readObject();

        System.out.println("2.反序列化后的对象\n"+rectangle1);

        rectangle1.setArea();

        System.out.println("3.恢复成原始对象\n"+rectangle1);

        in.close();

    }

}