[Java] 직렬화 대상에서 제외 transient

▶ 직렬화 대상에서 제외 transient

직렬화의 대상에서 제외시키고픈 인스턴스 변수가 잇다면 이를 transient로 선언하면 된다.

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

class PersonalInfo implements Serializable {

String name;

transient String secretInfo;

int age;

transient int secretNum;

public PersonalInfo(String name, String sInfo, int age, int sNum) {

this.name = name;

secretInfo = sInfo;

this.age = age;

secretNum = sNum;

}

public void showCirlceInfo() {

System.out.println("name : " + name);

System.out.println("secret info : " + secretInfo);

System.out.println("age : " + age);

System.out.println("secret num : " + secretNum);

System.out.println("");

}

}

public class TransientMembers {

public static void main(String[] args) throws IOException,

ClassNotFoundException {

// TODO Auto-generated method stub

ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("Personal.ser"));

PersonalInfo info = new PersonalInfo("John", "baby", 3, 42);

info.showCirlceInfo();

out.writeObject(info);

out.close();

ObjectInputStream in = new ObjectInputStream(new FileInputStream("Personal.ser"));

PersonalInfo recovInfo = (PersonalInfo)in.readObject();

in.close();

recovInfo.showCirlceInfo();

}

}

[결과]

name : John

secret info : baby

age : 3

secret num : 42

name : John

secret info : null

age : 3

secret num : 0