使用对象流将数据以对象形式进行读写

import java.io.*;

public class Test {

    public static void main(String[] args) {
        
        File f = new File("a.txt");
        try {
            if(!f.exists())
                f.createNewFile();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        
        try {
            ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream("a.txt")));
            Employe em = new Employe("xiaoming","123");
            oos.writeObject(em);
            oos.close();
            
            ObjectInputStream ois = new ObjectInputStream(new BufferedInputStream(new FileInputStream("a.txt")));
            em = (Employe)ois.readObject();
            System.out.println(em.name);
            
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }        
    }
}

class Employe implements Serializable {             //对象输出流的对象所对应的类应该实现Serializable接口
    String name;
    String id;
    
    Employe(String name,String id){
        this.name = name;
        this.id = id;    
    }    
}

 

FileOutputStream();还不太明白