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

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

深拷贝测试用例

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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