IO流之------对象流(输入输出对象)

处理流之Object流

•直接把对象写入或读出；

•需要实现serializable接口；

•注意serializable接口中没有定义任何方法，这种接口被称为标记型接口，标记之后给编译器看；（只能保存非静态的成员变量）

•Transient 关键字修饰的成员变量在序列化时不予考虑；

package io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class ObjectTest {
    
    //直接将对象写入和读出 
    public static void main(String[] args) {
        
        Dog dog = new Dog();
        dog.legnumber = 9;
        
        FileOutputStream fos = null;
        ObjectOutputStream oos = null;
        
        FileInputStream fis = null;
        ObjectInputStream ois = null;
        
        try {
            fos = new FileOutputStream(new File("D:/Java_test_file/test/aaa.txt"));
            oos = new ObjectOutputStream(fos);
            oos.writeObject(dog);
            
            fis = new FileInputStream("D:/Java_test_file/test/aaa.txt");
            ois = new ObjectInputStream(fis);
            Dog d = (Dog) ois.readObject();
            System.out.println(d.age+" "+d.color+" "+d.legnumber+" "+d.sex);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            
            e.printStackTrace();
        }
    }
    
    

}


class Dog implements Serializable {
    

    private static final long serialVersionUID = 1L;
    int age = 10;
    char sex = '母';
    //transient int legnumber = 4; //该属性透明化 透明化后该序列化不考虑该属性值
    int legnumber = 4;
    String color = "red";
    
    
}