【十四】Java设计模式GOF23之原型模式

版权声明：转载注明出处 https://blog.csdn.net/jy02268879/article/details/81638764

目录

浅复制

Sheep.java

import java.io.Serializable;
import java.util.Date;

/**
* 浅复制
*/
public class Sheep implements Cloneable,Serializable{
	private String sname;
	private Date birthday;
	
	@Override
	protected Object clone() throws CloneNotSupportedException {
		Object obj = super.clone();
		return obj;
	}

	public String getSname() {
		return sname;
	}

	public void setSname(String sname) {
		this.sname = sname;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public Sheep() {
		
	}

	public Sheep(String sname, Date birthday) {
		super();
		this.sname = sname;
		this.birthday = birthday;
	}
	
}

client.java

package com.bjsxt.prototype;

import java.util.Date;

/**
 * @author liyijie
 * @email [email protected]
 * @version 
 */
public class Client {
	public static void main(String[] args) throws CloneNotSupportedException {
		Date date = new Date(14800000000L);
		Sheep s1 = new Sheep("sheep1",date);
		Sheep s2 = (Sheep) s1.clone();
		
		System.out.println("s1:"+s1);
		System.out.println("s1:"+s1.getSname());
		System.out.println("s1:"+s1.getBirthday());
		
		date.setTime(14888888888L);
		System.out.println("s1:"+s1.getBirthday());
		
		
		s2.setSname("sheep2");
		System.out.println("s2:"+s2);
		System.out.println("s2:"+s2.getSname());
		//浅复制，S2引用的对象跟S1引用的是一个对象，s1的date对象修改后，s2的date对象也跟着修改
		System.out.println("s2:"+s2.getBirthday());
	}
}

深复制

Sheep2.java

import java.util.Date;

/**
 * @author liyijie
 * @date 2016��8��12������1:10:28
 * @email [email protected]
 * @remark 原型模式 深复制
 * @version 
 */
public class Sheep2 implements Cloneable{
	private String sname;
	private Date birthday;
	
	@Override
	protected Object clone() throws CloneNotSupportedException {
		Object obj = super.clone();
		
		//deep clone
		Sheep2 s = (Sheep2)obj;
		s.birthday = (Date) this.birthday.clone();//深复制
		return obj;
	}

	public String getSname() {
		return sname;
	}

	public void setSname(String sname) {
		this.sname = sname;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public Sheep2() {
		
	}

	public Sheep2(String sname, Date birthday) {
		super();
		this.sname = sname;
		this.birthday = birthday;
	}
	
}

Client2.java

import java.util.Date;

/**
 * 深复制
 * */
public class Client2 {
	public static void main(String[] args) throws CloneNotSupportedException {
		Date date = new Date(14800000000L);
		Sheep2 s1 = new Sheep2("sheep1",date);
		Sheep2 s2 = (Sheep2) s1.clone();
		System.out.println("s1:"+s1);
		System.out.println("s1:"+s1.getSname());
		System.out.println("s1:"+s1.getBirthday());
		
		date.setTime(14888888888L);
		System.out.println("s1:"+s1.getBirthday());
		
		
		s2.setSname("sheep2");
		System.out.println("s2:"+s2);
		System.out.println("s2:"+s2.getSname());
		System.out.println(s2.getBirthday());
	}
}

用反序列化方式实现原型模式

Client3.java

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Date;

/**
 * @author liyijie
 * @email [email protected]
 * @remark 用反序列化方式实现原型模式
 * @version 
 */
public class Client3 {
	public static void main(String[] args) throws CloneNotSupportedException, IOException, ClassNotFoundException {
		Date date = new Date(14800000000L);
		Sheep s1 = new Sheep("sheep1",date);
		
		
		System.out.println("s1:"+s1);
		System.out.println("s1:"+s1.getSname());
		System.out.println("s1:"+s1.getBirthday());
		
		//用序列化/反序列化的方式实现深复制
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		ObjectOutputStream oos = new ObjectOutputStream(bos);
		oos.writeObject(s1);
		byte[] bytes = bos.toByteArray();
		
		ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
		ObjectInputStream ois = new ObjectInputStream(bis);
		
		Sheep s2 = (Sheep) ois.readObject();
		
		date.setTime(14888888888L);//ֵ
		System.out.println("s1:"+s1.getBirthday());
		
		
		s2.setSname("sheep2");
		System.out.println("s2:"+s2);
		System.out.println("s2:"+s2.getSname());
		System.out.println(s2.getBirthday());
	}
}