原型模式-深克隆和浅克隆有什么区别？看完这个视频就都清楚了

复制运行时的对象，克隆出一个一模一样的对象

创建克隆对象

package com.lglbc.protype.simple;

public class Student implements Cloneable{
    private String name;
    private String email;
    private String address;
    private Teacher teacher;

    public Student(String name, String email, String address) {
        this.name = name;
        this.email = email;
        this.address = address;
    }

    public String getName() {
        return name;
    }

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

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    protected Student clone() {
        try {
            return (Student)super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", email='" + email + ''' +
                ", address='" + address + ''' +
                ", teacher=" + teacher +
                '}';
    }

    public Teacher getTeacher() {
        return teacher;
    }

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

package com.lglbc.protype.simple;

public class Teacher implements Cloneable {
    private String name;

    public Teacher(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

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

    @Override
    protected Teacher clone(){
        try {
            return (Teacher)super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "name='" + name + ''' +
                '}';
    }
}

测试

package com.lglbc.protype.simple;

public class Test {
    public static void main(String[] args) {
        Student student = new Student("a", "b", "c");
        student.setTeacher(new Teacher("张老师"));
        System.out.println(student.toString());
        Student cloneStudent = student.clone();
        System.out.println(student.toString());
        System.out.println(cloneStudent == student);

        cloneStudent.getTeacher().setName("杨老师");

        System.out.println(student.toString());

    }
}

重写clone方法，依次调用成员变量的clone方法

package com.lglbc.protype.deep;

import java.io.Serializable;

public class Student implements Cloneable, Serializable {
    private String name;
    private String email;
    private String address;
    private Teacher teacher;

    public Student(String name, String email, String address) {
        this.name = name;
        this.email = email;
        this.address = address;
    }

    public String getName() {
        return name;
    }

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

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    protected Student clone() {
        try {
            Student clone = (Student) super.clone();
            Teacher teacher = clone.getTeacher().clone();
            clone.setTeacher(teacher);
            return clone;
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", email='" + email + ''' +
                ", address='" + address + ''' +
                ", teacher=" + teacher +
                '}';
    }

    public Teacher getTeacher() {
        return teacher;
    }

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

通过序列化和反序列化实现

package com.lglbc.protype.deep.serializable;

import java.io.*;

public class Student implements Cloneable, Serializable {
    private String name;
    private String email;
    private String address;
    private Teacher teacher;

    public Student(String name, String email, String address) {
        this.name = name;
        this.email = email;
        this.address = address;
    }

    public String getName() {
        return name;
    }

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

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    protected Student clone() {

        ByteArrayOutputStream byteArrayOutputStream =null;
        ObjectOutputStream objectOutputStream =null;
        ByteArrayInputStream byteArrayInputStream =null;
        ObjectInputStream objectInputStream =null;
            try {
                 byteArrayOutputStream = new ByteArrayOutputStream();
                 objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
                objectOutputStream.writeObject(this);

                 byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
                 objectInputStream = new ObjectInputStream(byteArrayInputStream);
                Student student = (Student)objectInputStream.readObject();
                return student;
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                try {
                    byteArrayOutputStream.close();
                    byteArrayInputStream.close();
                    objectOutputStream.close();
                    objectInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        return null;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", email='" + email + ''' +
                ", address='" + address + ''' +
                ", teacher=" + teacher +
                '}';
    }

    public Teacher getTeacher() {
        return teacher;
    }

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

BeanUtils,MapStruct