java transient 关键字

package com.zzs.tet;

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

public class TransientDemo implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private  transient String name;
    private String password;
    
    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    /**
     * @param args
     * @throws IOException 
     * @throws FileNotFoundException 
     * @throws ClassNotFoundException 
     */
    public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException {
        // TODO Auto-generated method stub
        String path="D:"+File.separator+"object.txt";
        File file=new File(path);
        TransientDemo transientDemo=new TransientDemo();
        transientDemo.setName("姓名");
        transientDemo.setPassword("密码");
        ObjectOutput output=new ObjectOutputStream(new FileOutputStream(file));
        output.writeObject(transientDemo);
        ObjectInput input=new ObjectInputStream(new FileInputStream(file));
        TransientDemo demo=(    TransientDemo )input.readObject();
        System.out.println(demo.getName()+demo.getPassword());
    }

}

null密码