两种方式实现深拷贝

原理：把对象序列化成流，再从流反序列化成对象，这样就是新的对象了。

事前准备：

@Data
public class ItWorker  {
    private String name;
    private String sex;
    private LiveAddress address;
}

@Data
public class LiveAddress  {
    private String province;
    private String city;
    private String area;
}

方式一：通过json工具序列化，把对象序列化成json字符串，然后再从字符串反序列化成对象，从而实现深拷贝。

public static void main(String[] args) {
    ItWorker itWorker = new ItWorker();
    itWorker.setName("法外狂徒张三");
    itWorker.setSex("男");

    LiveAddress liveAddress = new LiveAddress();
    liveAddress.setProvince("江苏");
    liveAddress.setCity("苏州");
    liveAddress.setArea("独墅湖");
    itWorker.setAddress(liveAddress);

    ItWorker deepItWorker = JSON.parseObject(JSON.toJSonString(itWorker), ItWorker.class);
    deepItWorker.getAddress().setCity("南京");

    System.out.println(itWorker);
    System.out.println(deepItWorker);

}

输出：

ItWorker(name=法外狂徒张三, sex=男, address=LiveAddress(province=江苏, city=苏州, area=独墅湖))
ItWorker(name=法外狂徒张三, sex=男, address=LiveAddress(province=江苏, city=南京, area=独墅湖))

方式二：使用Apache Commons Lang中提供的SerializationUtils工具实现深拷贝。

前提：实现Serializable

public class ItWorker implements Serializable 

public class LiveAddress implements Serializable

public static void main(String[] args) {
    ItWorker itWorker = new ItWorker();
    itWorker.setName("法外狂徒张三");
    itWorker.setSex("男");

    LiveAddress liveAddress = new LiveAddress();
    liveAddress.setProvince("江苏");
    liveAddress.setCity("苏州");
    liveAddress.setArea("独墅湖");
    itWorker.setAddress(liveAddress);

    ItWorker deepClone = (ItWorker) SerializationUtils.clone(itWorker);
    deepClone.getAddress().setCity("峨眉山");
    System.out.println(itWorker);
    System.out.println(deepClone);

}

输出：

ItWorker(name=法外狂徒张三, sex=男, address=LiveAddress(province=江苏, city=苏州, area=独墅湖))
ItWorker(name=法外狂徒张三, sex=男, address=LiveAddress(province=江苏, city=峨眉山, area=独墅湖))