浅谈Java中实现深拷贝的两种方式—clone() & Serialized

package b1ch06.clone;import java.io.Serializable;class Car implements Cloneable, Serializable {  private String band;  public Car(String band) {    this.band = band;  }  public String getBand() {    return band;  }  public void setBand(String band) {    this.band = band;  }  @Override  public Object clone() throws CloneNotSupportedException {    return super.clone();  }}

package b1ch06.clone;import java.io.Serializable;class Employee implements Cloneable, Serializable {  private String name;  private Car car;  public Employee(String name, Car car) {    this.name = name;    this.car = car;  }  public String getName() {    return name;  }  public void setName(String name) {    this.name = name;  }  public Car getcar() {    return car;  }  public void setcar(Car car) {    this.car = car;  }  protected void test() {    System.out.println("test func");  }  @Override  public Object clone() throws CloneNotSupportedException {    Employee employee_cloned = (Employee) super.clone();    Car car_cloned = (Car) this.car.clone();    employee_cloned.setcar(car_cloned);    return employee_cloned;  }}

package b1ch06.clone;import java.io.*;public class SerializedClone {  @SuppressWarnings("unchecked")  public static <T extends Serializable> T clone(T obj) {    T cloneObj = null;    try {      //写入字节流      ByteArrayOutputStream out = new ByteArrayOutputStream();      ObjectOutputStream obs = new ObjectOutputStream(out);      obs.writeObject(obj);      obs.close();      //分配内存，写入原始对象，生成新对象      ByteArrayInputStream ios = new ByteArrayInputStream(out.toByteArray());      ObjectInputStream ois = new ObjectInputStream(ios);      //返回生成的新对象      cloneObj = (T) ois.readObject();      ois.close();    } catch (Exception e) {      e.printStackTrace();    }    return cloneObj;  }}

package b1ch06.clone;public class MyClone {  public static void main(String[] args) {    Car car = new Car("BMW");    Employee employee = new Employee("ANDY", car);    // 方法一：覆盖所有涉及到的类的clone()方法    try {      Employee employee_cp = (Employee) employee.clone();      System.out.println("=========================");      System.out.println("original对象地址?:");      System.out.println(employee.toString());      System.out.println("copy对象地址?:");      System.out.println(employee_cp.toString());      System.out.println("前后两个对象指向同一地址?:");      System.out.println(employee_cp == employee);      System.out.println("=========================");      System.out.println("original对象中car对象地址?:");      System.out.println(employee.getcar().toString());      System.out.println("copy对象中car对象地址?:");      System.out.println(employee_cp.getcar().toString());      System.out.println("前后两个car对象指向同一地址?:");      System.out.println(employee_cp == employee);    } catch (CloneNotSupportedException e) {      e.printStackTrace();    }    // 方法二：序列化实现深拷贝    Employee cloned_employee = SerializedClone.clone(employee);    System.out.println("=========================");    System.out.println("original对象地址?:");    System.out.println(employee.toString());    System.out.println("copy对象地址?:");    System.out.println(cloned_employee.toString());    System.out.println("前后两个对象指向同一地址?:");    System.out.println(cloned_employee == employee);    System.out.println("=========================");    System.out.println("original对象中car对象地址?:");    System.out.println(employee.getcar().toString());    System.out.println("copy对象中car对象地址?:");    System.out.println(cloned_employee.getcar().toString());    System.out.println("前后两个car对象指向同一地址?:");    System.out.println(cloned_employee == employee);  }}