java的transient关键字

import java.io.Serializable;
/**
 * @Description transient关键字  被修饰的字段不会被序列化传输(继承Serializable)
 * @Author rll
 * @Date 2021-01-04 10:16
 */
public class User implements Serializable {
    private static final long serialVersionUID = 5001293179270499108L;
    private String name;
    private transient String pwd;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
}

import java.io.*;
/**
 * @Description transient关键字
 * @Author rll
 * @Date 2021-01-04 10:21
 */
public class TransientTest {
    public static void main(String[] args) {
        User u1= new User();
        u1.setName("testName");
        u1.setPwd("pwd123");
        System.out.println("read before Serializable: ");
        System.out.println("username: " + u1.getName());
        System.err.println("password: " + u1.getPwd());

        String fileName = "D:/user.txt";
        //写入文件
        try {
            ObjectOutputStream oops = new ObjectOutputStream(new FileOutputStream(fileName));
            oops.writeObject(u1);
            oops.flush();
            oops.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //读取对象
        try {
            ObjectInputStream oips = new ObjectInputStream(new FileInputStream(fileName));
            User u2 = (User) oips.readObject();
            oips.close();
            System.out.println("read after Serializable: ");
            System.out.println("username: " + u2.getName());
            System.err.println("password: " + u2.getPwd());
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}