/*** 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;}@Overridepublic 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();}
}