目录

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

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1、通过继承Cloneable接口，重写clone方法实现深克隆

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

2、通过序列化与反序列化的方式实现深克隆

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();
}

3、第三方工具类实现深克隆，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;
}

3.1、Apache Commons Lang的SerializationUtils.clone方法

<dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId>
</dependency>

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

<dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.8.5</version>
</dependency>

@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

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.78</version>
</dependency>

@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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