深浅复制详解-优快云博客

本文链接：https://blog.youkuaiyun.com/yhy19910223/article/details/83837138

本文通过具体实例对比展示了Java中深复制与浅复制的区别。深复制实现了对象及其引用对象的完整复制，而浅复制仅复制了对象本身，对于引用的对象则共享同一内存地址。

这是改的一个例子（关于深复制：连同该对象的引用一起复制）：

class Professor implements Cloneable
{
    String name;
    int age;
    Professor(String name,int age)
    {
        this.name=name;
        this.age=age;
    }
    public Object clone()
    {
        Professor o=null;
        try
        {
            o=(Professor)super.clone();
        }
        catch(CloneNotSupportedException e)
        {
            System.out.println(e.toString());
        }
        return o;
    }
}
class Student implements Cloneable
{
    String name;
    int age;
    Professor p;
    Student(String name,int age,Professor p)
    {
        this.name=name;
        this.age=age;
        this.p=p;
    }
    public Object clone()
    {
        Student o=null;
        try
        {
            o=(Student)super.clone();
            o.p=(Professor)p.clone();
        }
        catch(CloneNotSupportedException e)
        {
            System.out.println(e.toString());
        }
        
        return o;
    }
}
public class DeepClone{
    public static void main(String[] args)
    {
      Professor p=new Professor("wangwu",50);
      Student s1=new Student("zhangsan",18,p);
      Student s2=(Student)s1.clone();
      s2.p.name="lisi";
      s2.p.age=30;
      System.out.println("name="+s1.p.name+","+"age="+s1.p.age);
    }
}

下面是同样例子的浅复制（复制体中的引用和原体中的引用相同，指向同一内存地址）：

class Professor
{
    String name;
    int age;
    Professor(String name,int age)
    {
        this.name=name;
        this.age=age;
    }
}
class Student implements Cloneable
{
    String name;
    int age;
    Professor p;
    Student(String name,int age,Professor p)
    {
        this.name=name;
        this.age=age;
        this.p=p;
    }
    public Object clone()
    {
        Student o=null;
        try
        {
            o=(Student)super.clone();
        }
        catch(CloneNotSupportedException e)
        {
            System.out.println(e.toString());
        }
        
        return o;
    }
}
public class ShallowClone{
    public static void main(String[] args)
    {
      Professor p=new Professor("wangwu",50);
      Student s1=new Student("zhangsan",18,p);
      Student s2=(Student)s1.clone();
      s2.p.name="lisi";
      s2.p.age=30;
      System.out.println("name="+s1.p.name+","+"age="+s1.p.age);
    }
}

一个深复制例子