java深克隆浅克隆

最新推荐文章于 2021-02-21 15:49:26 发布

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本文通过实例详细介绍了Java中浅克隆与深克隆的区别及其实现方式，展示了两种克隆方式下对象引用的变化。

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浅克隆：只复制当前类的简单属性

深克隆：复制当前类中的简单属性及复杂类型属性。

可能说的不是太清楚，运行如下代码就都清楚啦！

Student.java

package com.hitachi.clone;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

public class Student implements Cloneable,Serializable {

/**

* @Fields serialVersionUID : TODO 变量名称

private static final long serialVersionUID = 5474483935180730022L;

private String name;

private Integer age;

private Professor professor;

public String getName() {

return name ;

}

public void setName(String name ) {

this.name = name ;

}

public Integer getAge() {

return age ;

}

public void setAge(Integer age ) {

this.age = age ;

}

public Professor getProfessor() {

return professor ;

}

public void setProfessor(Professor professor ) {

this.professor = professor ;

}

/**

* @Description：浅克隆

* @return: 返回结果描述

* @return Object: 返回值类型

* @throws

public Object shallowClone() {

Object o= null;

try {

o= super.clone();//Object 中的clone()识别出你要复制的是哪一个对象。

} catch(CloneNotSupportedException e ) {

System. out.println(e .toString());

}

return o ;

}

/**

* @Description：深克隆

* @return

* @throws IOException

* @throws ClassNotFoundException: 返回结果描述

* @return Object: 返回值类型

* @throws

public Object deepClone() throws IOException, ClassNotFoundException{

ByteArrayOutputStream out= new ByteArrayOutputStream();

ObjectOutputStream oos= new ObjectOutputStream(out );

oos.writeObject( this);

ByteArrayInputStream input= new ByteArrayInputStream(out.toByteArray());

ObjectInputStream ois= new ObjectInputStream(input );

return ois .readObject();

}

@Override

public String toString() {

return "Student [name=" + name + ", age=" + age + ", professor=" + professor + "]" ;

}

Professor.java

package com.hitachi.clone;

import java.io.Serializable;

public class Professor implements Serializable {

/**

* @Fields serialVersionUID : TODO 变量名称

private static final long serialVersionUID = -3321860827572727878L;

private String name;

private Integer age;

public String getName() {

return name ;

}

public void setName(String name ) {

this.name = name ;

}

public Integer getAge() {

return age ;

}

public void setAge(Integer age ) {

this.age = age ;

}

@Override

public String toString() {

return "Professor [name=" + name + ", age=" + age + "]" ;

}

Test.java

package com.hitachi.clone;

import java.io.IOException;

public class Test {

public static void main(String[] args) {

Student stu= new Student();

stu.setAge(23);

stu.setName( "小鸟");

Professor pro= new Professor();

pro.setAge(42);

pro.setName( "大鸟");

stu.setProfessor( pro);

Student stu2=(Student) stu.shallowClone();

stu2.setAge(24);

stu2.setName( "小小");

stu2.getProfessor().setAge(43);

System. out.println(stu );

System. out.println(stu2 );

Student stu1= new Student();

stu1.setAge(23);

stu1.setName( "小鸟");

Professor pro1= new Professor();

pro1.setAge(42);

pro1.setName( "大鸟");

stu1.setProfessor( pro1);

try {

Student stu3 = (Student) stu1.deepClone();

stu3.setAge(24);

stu3.setName( "小小");

stu3.getProfessor().setAge(44);

System. out.println(stu1 );

System. out.println(stu3 );

} catch (ClassNotFoundException e ) {

e.printStackTrace();

} catch (IOException e ) {

e.printStackTrace();

}