深拷贝和浅拷贝

java代码实现

 

浅拷贝：你获取teacher1拷贝后的对象teacher2，你使用teacher2去修改某个引用对象会改变之前的对象的引用，相当于将teacher2的引用指向teacher的对象引用。深拷贝就不会，相当于复制了一份过来。

但是如果是基本数据类型：不管深拷贝、浅拷贝都不会改变之前的，因为基础类型克隆的是值。

如果是String或者Integer这种包装类型：不管深拷贝、浅拷贝都不会改变之前的。因为他们都是不可变类。

string我就不截图了，Integer图：

 

 

 

 

 

 

 

package tempTest;

import java.util.ArrayList;
import java.util.List;

public class CopyTest {
    public static void main(String[] args) throws Exception {

        Teacher teacher = new Teacher("王老师",41);
        Student student1 = new Student("陶同学",22);
        //Student student2 = new Student("黄同学",21);
        teacher.setStudent(student1);

        Teacher teacher2 = (Teacher) teacher.clone();
        teacher2.setName("陶老师");
        System.out.println("克隆后的打印被克隆的王老师和克隆产生的陶老师--------");
        System.out.println(teacher.getName()+"的学生："+teacher.getStudent().getName());
        System.out.println(teacher2.getName()+"的学生："+teacher2.getStudent().getName());

        teacher2.getStudent().setName("龚同学");
        System.out.println("给第二个老师将学生姓名改为龚同学-----");
        System.out.println(teacher.getName()+"的学生："+teacher.getStudent().getName());
        System.out.println(teacher2.getName()+"的学生："+teacher2.getStudent().getName());

    }
}

class Teacher implements Cloneable{
    private String name;
    private int age;
    private Student student;

    @Override
    public Object clone() throws CloneNotSupportedException {
　　　　//深拷贝
        Teacher teacher = (Teacher) super.clone();
        teacher.student = (Student) student.clone();
        return teacher;
　　　　  //浅拷贝return super.clone
    }

}

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

    @Override
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

}