【Java每日一题】20161114

package Nov2016;

import java.io.Serializable;

// V1.0版
public class Ques1114 implements Serializable{

    private static final long serialVersionUID = 1L;

    public final int num;

    public Ques1114(){
        num = 123;
    }
}

// 序列化到磁盘
public class TestSerialize{
    public static void main(String[] args) {
        SerializeUtils.writeObject(new Ques1114()); 
    }
}

// V2.0版 修改num值（serialVersionUID保持不变）
public class Ques1114 implements Serializable{

    private static final long serialVersionUID = 1L;

    public final int num;

    public Ques1114(){
        num = 321;
    }
}

// 反序列化
public class TestDeserialize{
    public static void main(String[] args) {
        Ques1114 ques1114 = (Ques1114)SerializeUtils.readObject();
        System.out.println(ques1114.num);  // 输出值
    }
}