Java深克隆的几种方式

推荐课程 1、通过继承Cloneable接口，重写clone方法实现深克隆

2、通过序列化与反序列化的方式实现深克隆

3、第三方工具类实现深克隆，克隆对象需继承Serializable接口

3.1、Apache Commons Lang的SerializationUtils.clone方法

3.2、Gson工具类

3.3、FastJson工具类

@Data
@AllArgsConstructor
@ToString
public class User implements Cloneable{
    private String name;
    private int age;
    private House house;

    @Override
    protected User clone() throws CloneNotSupportedException {
        User user = (User) super.clone();
        user.setHouse(house.clone());
        return user;
    }
}

@Data
@AllArgsConstructor
@ToString
public class House implements Cloneable{
    private String location;
    private double price;

    @Override
    protected House clone() throws CloneNotSupportedException {
        return (House) super.clone();
    }
}public static void main(String[] args) {
    House house = new House("市区", 58955);
    User user = new User("张三", 18, house);
    User cloneUser = user.clone();
}

克隆对象需继承Serializable接口

@Data
@AllArgsConstructor
@ToString
public class House implements Serializable {
    private String location;
    private double price;
}

@Data
@AllArgsConstructor
@ToString
public class User implements Serializable {
    private String name;
    private int age;
    private House house;
}

@SneakyThrows
public static void main(String[] args) {
    House house = new House("市区", 58955);
    User user = new User("张三", 18, house);

    //序列化
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
    objectOutputStream.writeObject(user);
    //反序列化
    ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
    ObjectInputStream objectInputStream = new ObjectInputStream(inputStream);
    User cloneUser = (User)objectInputStream.readObject();
}

@Data
@AllArgsConstructor
@ToString
public class House implements Serializable {
    private String location;
    private double price;
}

@Data
@AllArgsConstructor
@ToString
public class User implements Serializable {
    private String name;
    private int age;
    private House house;
}

3.1、Apache Commons Lang的SerializationUtils.clone方法

    org.apache.commons
    commons-lang3

public static void main(String[] args) {
    House house = new House("市区", 58955);
    User user = new User("张三", 18, house);
    User cloneUser = SerializationUtils.clone(user);
}

3.2、Gson工具类

    com.google.code.gson
    gson
    2.8.5

@SneakyThrows
public static void main(String[] args) {
    House house = new House("市区", 58955);
    User user = new User("张三", 18, house);    Gson gson = new Gson();
    //将对象序列化为json字符串
    String userStr = gson.toJson(user);
    //然后将字符串反序列化为对象
    User cloneUser = gson.fromJson(userStr, User.class);
}

3.3、FastJson工具类

    com.alibaba
    fastjson
    1.2.78

@SneakyThrows
public static void main(String[] args) {
    House house = new House("市区", 58955);
    User user = new User("张三", 18, house);

    //将对象序列化为json字符串
    String userStr = JSON.toJSONString(user);
    //然后将字符串反序列化为对象
    User cloneUser = JSON.parseObject(userStr, User.class);
}

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