Clone-demo

---

• 浅复制

package com.mode.demo.clone;

public class CloneTest1 {

    public static void main(String[] args) throws CloneNotSupportedException {
        Student1 s1 = new Student1("eve0", 18);
        Teacher1 teacher = new Teacher1();
        teacher.setAge(40);
        teacher.setName("ha");
        s1.setTeacher(teacher);
        Student1 s2 = (Student1) s1.clone();
        s2.setAge(23);
        s2.setName("二狗子");
        Teacher1 t2 = s2.getTeacher();
        t2.setAge(60);
        t2.setName("zhang");
        System.out.println("第二位学生："+s2.getName() + ":" + s2.getAge());
        System.out.println("第二位老师："+t2.getName() + ":" + t2.getAge());
        System.out.println("第一位学生："+s1.getName() + ":" + s1.getAge());
        System.out.println("第一位老师"+teacher.getName() + ":" + teacher.getAge());

    }

}

class Student1 implements Cloneable {
    private String name;
    private int age;
    private Teacher1 teacher;

    public Student1() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Student1(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Teacher1 getTeacher() {
        return teacher;
    }

    public void setTeacher(Teacher1 teacher) {
        this.teacher = teacher;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {

    //  Student1 s2 = (Student1) super.clone();
    //  s2.setTeacher((Teacher1) s2.getTeacher().clone());
    //  return s2;
        return super.clone();

    }

}

class Teacher1 implements Cloneable {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        // TODO Auto-generated method stub
        return super.clone();
    }

}

显示结果：

第二位学生：二狗子:23
第二位老师：zhang:60
第一位学生：eve0:18
第一位老师zhang:60

修改s2的值，s1的值也会跟着改变，请看下图

s1,s2中的teacher同时指向同一个对象

• 深复制
  1.实现方式1：修改Student1中的clone方法

    @Override
    protected Object clone() throws CloneNotSupportedException {

        Student1 s2 = (Student1) super.clone();
        s2.setTeacher((Teacher1) s2.getTeacher().clone());
        return s2;

    }

显示结果：

第二位学生：二狗子:23
第二位老师：zhang:60
第一位学生：eve0:18
第一位老师ha:40

2.实现方式2：通过实现Serializable接口方式

public class CloneTest1 {

    public static void main(String[] args) throws Exception {
        Student1 s1 = new Student1("eve0", 18);

        Teacher1 teacher = new Teacher1();

        teacher.setAge(40);
        teacher.setName("张老师");

        s1.setTeacher(teacher);

        Student1 s2 = (Student1) s1.deepCopy();

        s2.setAge(23);
        s2.setName("二狗子");

        Teacher1 t2 = s2.getTeacher();
        t2.setAge(60);
        t2.setName("王老师");

        System.out.println("第二位学生：" + s2.getName() + "，" + s2.getAge());
        System.out.println("第二位老师：" + t2.getName() + "，" + t2.getAge());
        System.out.println("第一位学生：" + s1.getName() + "，" + s1.getAge());
        System.out.println("第一位老师：" + teacher.getName() + "，" + teacher.getAge());

    }

}

class Student1 implements Serializable {
    private String name;
    private int age;
    private Teacher1 teacher;

    public Student1() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Student1(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Teacher1 getTeacher() {
        return teacher;
    }

    public void setTeacher(Teacher1 teacher) {
        this.teacher = teacher;
    }

    public Object deepCopy() throws Exception {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(os);
        oos.writeObject(this);
        ByteArrayInputStream bais = new ByteArrayInputStream(os.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bais);
        return ois.readObject();
    }

}

class Teacher1 implements Serializable{
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

}

显示结果：

第二位学生：二狗子:23
第二位老师：王老师:60
第一位学生：eve0:18
第一位老师张老师:40