对象流: ObjectInputStream 和 ObjectOutputStream

public static void main(String[] args) {
        //1 准备
        Person p1 = new Person("张三", true, 21 );
        Person p2 = new Person("李四", false, 20 );
        Person p3 = new Person("王二", false, 19 );
        
        String path = "d:/objects.dat";
        
        //2 声明 
        ObjectOutputStream  oos = null;
        ObjectInputStream  ois = null;
        
        //3 创建
        try {
            oos = new ObjectOutputStream( new FileOutputStream( path) );
            ois = new ObjectInputStream( new FileInputStream( path) );
            
            //4 存盘
            oos.writeObject( p1 );
            oos.writeObject( p2 );
            oos.writeObject( p3 );
            
            //5 确保存盘成功
            oos.flush();
            System.out.println("\n已将对象存盘到 " + path + " 文件中了。");
            
            //6 读取对象
            Object obj = ois.readObject();
            p1 = (Person) obj;
            System.out.println( "p1>>> " + p1 );
            System.out.println("p1，你帮我做一道算术题，行吗？");
            System.out.println("没有问题，把数据给我就行了。");
            System.out.println("算术题完成如下：");
            int a = (int)(2331 * Math.random());
            int b = (int)(989 * Math.random());
            int re = p1.add(a, b);
            System.out.println( re );
            
            obj = ois.readObject();
            p1 = (Person) obj;
            System.out.println( ">>> " + p1 );
            
            obj = ois.readObject();
            p1 = (Person) obj;
            System.out.println( ">>>"  + p1 );
            
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
         
        } finally {
            try {
                oos.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

package com.bjsxt.d821;

import java.io.Serializable;

public class Person  implements  Serializable { //实现该接口，从而让它的对象完成序列化（串行化）。
    
    private String name;
    private boolean sex;
    private int age;
    
    public Person() {

    }

    public Person(String name, boolean sex, int age) {
        this.name = name;
        this.sex = sex;
        this.age = age;
    }
    
    //
    //
    
    @Override
    public String toString() {
        return "姓名: " + name + "  性别: " + (sex ? "男":"女") + "  年龄: " + age;
    }
    
    public int add( int x, int y ){
        System.out.printf("%d + %d = " , x , y );
        return x + y;
    }
}