java 序列化对象

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武汉淘淘 2022-07-05 17:04:38 博主文章分类：JAVA

// 每个枚举类型都会默认继承类java.lang.Enum，而Enum类实现了Serializable接口，所以枚举类型对象都是默认可以被序列化的。
enum Gender {
    MALE, FEMALE
}



// Person 类实现了 Serializable 接口，它包含三个字段。另外，它还重写了该类的 toString() 方法，以方便打印 Person 实例中的内容。
public class Person implements Serializable {
    private String name = null;
    private Integer age = null;
    private Gender gender = null;

    public Person() {
        System.out.println("none-arg constructor");
    }

    public Person(String name, Integer age, Gender gender) {
        System.out.println("arg constructor");
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
 
    // 省略 set get 方法
    @Override
    public String toString() {
        return "[" + name + ", " + age + ", " + gender + "]";
    }
}


public class SimpleSerial {
    public static void main(String[] args) throws Exception {
        File file = new File("person.out");
        ObjectOutputStream oout = new ObjectOutputStream(new FileOutputStream(file));
        Person person = new Person("John", 101, Gender.MALE);
        oout.writeObject(person);
        oout.close();

        ObjectInputStream oin = new ObjectInputStream(new FileInputStream(file));
        Object newPerson = oin.readObject();
        oin.close();
        System.out.println(newPerson);
    }
}