看源码的时候,发现transient这个关键字,不甚理解,查找资料发现:不被序列化

疑问:

• 静态变量是不是不被序列化？

public class User implements Serializable {

	private static final long serialVersionUID = 2877054094045568710L;

	private String username;

	private transient String password;

	private static int age;

	public String getUsername() {

		return username;

	}

	public void setUsername(String username) {

		this.username = username;

	}

	public String getPassword() {

		return password;

	}

	public void setPassword(String password) {

		this.password = password;

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		User.age = age;

	}

	public static void main(String[] args) {

		User user = new User();

		user.setUsername("imeng");

		user.setPassword("123456");

		user.setAge(22);

		try {

			ObjectOutputStream os = new ObjectOutputStream(

			        new FileOutputStream("/Users/imeng/Desktop/user.txt"));

			os.writeObject(user);

			os.close();

		} catch (IOException e) {

			e.printStackTrace();

		}

		//序列号后改变Static的值

		user.setAge(100);

		ObjectInputStream oi;

		try {

			oi = new ObjectInputStream(new FileInputStream("/Users/imeng/Desktop/user.txt"));

			User readUser = (User) oi.readObject();

			System.out.println("username:" + readUser.getUsername());

			System.out.println("transient关键字password:" + readUser.getPassword());

			System.out.println("静态变量age:" + readUser.getAge());

		} catch (FileNotFoundException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

	}

}

username:imeng

password:null

age:100

结论:

• transient关键字可以阻止序列化
• 序列号并不保存静态变量