Java实现对象深度克隆

两种方式：
  1). 实现Cloneable接口并重写Object类中的clone()方法；
  2). 实现Serializable接口，通过对象的序列化和反序列化实现克隆，可以实现真正的深度克隆，代码如下

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class MyUtil {

    private MyUtil() {
        throw new AssertionError();
    }

    @SuppressWarnings("unchecked")
    public static <T extends Serializable> T clone(T obj) throws Exception {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bout);
        oos.writeObject(obj);

        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bin);
        return (T) ois.readObject();

        // 说明：调用ByteArrayInputStream或ByteArrayOutputStream对象的close方法没有任何意义
        // 这两个基于内存的流只要垃圾回收器清理对象就能够释放资源，这一点不同于对外部资源（如文件流）的释放
    }
}

class Student implements Cloneable{
    private String name;
    private int age;
    private StudentClass studentClass;
    private List<String> list = new ArrayList<>();
    
    public Student() {
        // TODO Auto-generated constructor stub
        System.out.println("构造方法被调用");
    }
    
    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 StudentClass getStudentClass() {
        return studentClass;
    }
 
 
    public void setStudentClass(StudentClass studentClass) {
        this.studentClass = studentClass;
    }
    
    public void add(String aa){
        this.list.add(aa);
    }
 
 
    @Override
    public Object clone() throws CloneNotSupportedException {
        // TODO Auto-generated method stub
        Student stu = (Student) super.clone();
        
        return stu;
    }
    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + ",class"+studentClass.getStudentClass()+",list"+list+"]";
    }
    
}