java中的浅拷贝与深拷贝

本文由java零基础入门栏目为大家介绍java中的浅拷贝与深拷贝,希望可以帮助大家更好地理解两者的区别。浅拷贝是会将对象的每个属性进行依次复制,深拷贝复制变量值。

java中的浅拷贝与深拷贝

1、什么叫Java浅拷贝?

浅拷贝是会将对象的每个属性进行依次复制,但是当对象的属性值是引用类型时,实质复制的是其引用,当引用指向的值改变时也会跟着变化。

2、什么叫Java深拷贝?

深拷贝复制变量值,对于引用数据,则递归至基本类型后,再复制。深拷贝后的对象与原来的对象是完全隔离的,互不影响,对一个对象的修改并不会影响另一个对象。

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3、Java浅拷贝和深拷贝的区别是什么?

通俗来讲浅拷贝的复制其引用,当引用指向的值改变时也会跟着变化;而深拷贝则是与原来的对象完全隔离,互补影响。

4、思维导图

1.png

5、测试用例分析

浅拷贝测试用例

public class ShallowExperience {
    private String skill;
    public void setSkill(String skill) {
        this.skill = skill;
    }
    public void setShallowExperience(String skill) {
        this.skill = skill;
    }
    @Override
    public String toString() {
        return skill;
    }
}
public class ShallowCloneTest implements Cloneable {
    private int age;
    private ShallowExperience shallowExperience;
    public ShallowCloneTest() {
        this.age = 10;
        this.shallowExperience = new ShallowExperience();
    }
    public ShallowExperience getExperience() {
        return shallowExperience;
    }
    public void setShallowExperience(String skill) {
        shallowExperience.setShallowExperience(skill);
    }
    public void show() {
        System.out.println(shallowExperience.toString());
    }
    public int getAge() {
        return age;
    }
    @Override
    protected Object clone() throws CloneNotSupportedException {
        return (ShallowCloneTest) super.clone();
    }
}
public class TestMain {
    public static void main(String[] args) throws CloneNotSupportedException {
        System.out.println("======浅拷贝======");
        shallowCloneTest();
    }
    /**
     * 浅拷贝测试用例
     *
     * @throws CloneNotSupportedException
     */
    private static void shallowCloneTest() throws CloneNotSupportedException {
        ShallowCloneTest test = new ShallowCloneTest();
        test.setShallowExperience("我是小明,我精通Java,C++的复制粘贴");
        test.show();
        ShallowCloneTest cloneTest = (ShallowCloneTest) test.clone();
        cloneTest.show();
        cloneTest.setShallowExperience("我是小明的副本,我精通Java,C++");
        cloneTest.show();
        test.show();
        System.out.println(cloneTest.getAge());
    }
}
//运行结果
======浅拷贝======
我是小明,我精通Java,C++的复制粘贴
我是小明,我精通Java,C++的复制粘贴
我是小明的副本,我精通Java,C++
我是小明的副本,我精通Java,C++
10
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深拷贝测试用例

此代码由Java架构师必看网-架构君整理
public class DeepExperience implements Cloneable{ private String skill; public void setSkill(String skill) { this.skill = skill; } public void setDeepExperience(String skill) { this.skill = skill; } @Override public String toString() { return skill; } @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } } public class DeepCloneTest implements Cloneable { private int age; private DeepExperience deepExperience; public DeepCloneTest() { this.age = 10; this.deepExperience = new DeepExperience(); } public DeepExperience getExperience() { return deepExperience; } public void setDeepExperience(String skill) { deepExperience.setDeepExperience(skill); } public void show() { System.out.println(deepExperience.toString()); } public int getAge() { return age; } @Override protected Object clone() throws CloneNotSupportedException { DeepCloneTest deepCloneTest = (DeepCloneTest) super.clone(); deepCloneTest.deepExperience = (DeepExperience) deepCloneTest.getExperience().clone(); return deepCloneTest; } } public class TestMain { public static void main(String[] args) throws CloneNotSupportedException { System.out.println("======深拷贝======"); deepCloneTest(); } /** * 深拷贝测试用例 * * @throws CloneNotSupportedException */ private static void deepCloneTest() throws CloneNotSupportedException { DeepCloneTest test = new DeepCloneTest(); test.setDeepExperience("我是小明,我精通Java,C++的复制粘贴"); test.show(); DeepCloneTest cloneTest = (DeepCloneTest) test.clone(); cloneTest.show(); cloneTest.setDeepExperience("我是小明的副本,我精通Java,C++"); cloneTest.show(); test.show(); System.out.println(cloneTest.getAge()); } } //运行结果 ======深拷贝====== 我是小明,我精通Java,C++的复制粘贴 我是小明,我精通Java,C++的复制粘贴 我是小明的副本,我精通Java,C++ 我是小明,我精通Java,C++的复制粘贴 10

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