设计模式~原始模型模式（二）

这里给出一个原始模型模式的例子。孙大圣的身外身法术

浅复制

设计图如下：

 TheGreatestSage类扮演客户角色。

TheGreatestSage类

package com.vincent.prototype;

public class TheGreatestSage {

    private Monkey monkey = new Monkey();
    public void change(){
        Monkey copyMonkey;
        for(int i=0;i<2000;i++){};
        copyMonkey = (Monkey)monkey.clone();
        System.out.println("Monkey King's birth date="+monkey.getBirthDate());
        System.out.println("Copy monkey's birth date="+copyMonkey.getBirthDate());
        System.out.println("Monkey King == Copy Monkey?"+(monkey==copyMonkey));
        System.out.println("Monkey King's Staff==Copy Monkey's Staff?"+(monkey.getStaff()==copyMonkey.getStaff()));
        
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        TheGreatestSage sage = new TheGreatestSage();
        sage.change();
        
    }

}

Monkey类

package com.vincent.prototype;

import java.util.Date;

public class Monkey implements Cloneable {

    private int height;
    private int weight;
    private GoldRingedStaff staff;
    private Date birthDate;
    
    /**
     * 构造函数
     */
    public Monkey(){
        this.birthDate = new Date();
    }
    
    public Object clone(){
        Monkey temp = null;
        try{
            temp = (Monkey)super.clone();
        }catch(CloneNotSupportedException e){
            System.out.println("Clone failed");
        }finally{
            return temp;
        }
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int getWeight() {
        return weight;
    }

    public void setWeight(int weight) {
        this.weight = weight;
    }

    public Date getBirthDate() {
        return birthDate;
    }

    public void setBirthDate(Date birthDate) {
        this.birthDate = birthDate;
    }

    public GoldRingedStaff getStaff() {
        return staff;
    }

    public void setStaff(GoldRingedStaff staff) {
        this.staff = staff;
    }
    
}

GoldRingedStaff类

package com.vincent.prototype;

public class GoldRingedStaff {

    private float height = 100.F;
    private float diameter = 10.F;
    
    /**
     * 构造函数
     */
    public GoldRingedStaff(){
        // write your code here
    }
    /**
     * 增长行为
     */
    public void grow(){
        this.diameter *=2.0;
        this.height *=2.0;
    }
    /**
     * 缩小行为
     */
    public void shrink(){
        this.diameter /= 2;
        this.height /= 2;
    }
    
    public void move(){
        //wirte you code for moving the staff
    }
    public float getHeight() {
        return height;
    }
    public void setHeight(float height) {
        this.height = height;
    }
    public float getDiameter() {
        return diameter;
    }
    public void setDiameter(float diameter) {
        this.diameter = diameter;
    }
    
}

运行结果如下：

Monkey King's birth date=Fri Aug 14 07:15:59 CST 2020
Copy monkey's birth date=Fri Aug 14 07:15:59 CST 2020
Monkey King == Copy Monkey?false
Monkey King's Staff==Copy Monkey's Staff?true

深复制

为做到深复制，所有需要复制的对象需要实现 java.io.Serializable接口。

系统设计如下：

 TheGreatestSage类

package com.vincent.prototype;

import java.io.IOException;

public class TheGreatestSage {

    private Monkey monkey = new Monkey();
    public void change() throws IOException,ClassNotFoundException{
        Monkey copyMonkey;
        for(int i=0;i<2000;i++){};
        copyMonkey = (Monkey)monkey.deepClone();
        System.out.println("Monkey King's birth date="+monkey.getBirthDate());
        System.out.println("Copy monkey's birth date="+copyMonkey.getBirthDate());
        System.out.println("Monkey King == Copy Monkey?"+(monkey==copyMonkey));
        System.out.println("Monkey King's Staff==Copy Monkey's Staff?"+(monkey.getStaff()==copyMonkey.getStaff()));
        
    }
    
    public static void main(String[] args) throws IOException,ClassNotFoundException{
        // TODO Auto-generated method stub

        TheGreatestSage sage = new TheGreatestSage();
        sage.change();
        
    }

}

Monkey 

package com.vincent.prototype;

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

public class Monkey implements Cloneable,Serializable {

    private int height;
    private int weight;
    private GoldRingedStaff staff;
    private Date birthDate;
    
    /**
     * 构造函数
     */
    public Monkey(){
        this.birthDate = new Date();
        this.staff = new GoldRingedStaff();
    }
    /**
     * 深克隆方法
     * @return
     * @throws IOException
     * @throws OptionalDataException
     * @throws ClassNotFoundException
     */
    public Object deepClone() throws IOException,OptionalDataException,ClassNotFoundException
    {
        //首先将对象写出到流里
        ByteArrayOutputStream bo = new ByteArrayOutputStream();
        ObjectOutputStream oo = new ObjectOutputStream(bo);
        oo.writeObject(this);
        //然后将对象从流里读出来
        ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());
        ObjectInputStream oi = new ObjectInputStream(bi);
        
        return (oi.readObject());
    }
    /**
     * 浅克隆方法
     */
    public Object clone(){
        Monkey temp = null;
        try{
            temp = (Monkey)super.clone();
        }catch(CloneNotSupportedException e){
            System.out.println("Clone failed");
        }finally{
            return temp;
        }
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public int getWeight() {
        return weight;
    }

    public void setWeight(int weight) {
        this.weight = weight;
    }

    public Date getBirthDate() {
        return birthDate;
    }

    public void setBirthDate(Date birthDate) {
        this.birthDate = birthDate;
    }

    public GoldRingedStaff getStaff() {
        return staff;
    }

    public void setStaff(GoldRingedStaff staff) {
        this.staff = staff;
    }
    
}

GoldRingedStaff

package com.vincent.prototype;

import java.io.Serializable;

public class GoldRingedStaff implements Cloneable,Serializable{

    private float height = 100.F;
    private float diameter = 10.F;
    
    /**
     * 构造函数
     */
    public GoldRingedStaff(){
        // write your code here
    }
    /**
     * 增长行为
     */
    public void grow(){
        this.diameter *=2.0;
        this.height *=2.0;
    }
    /**
     * 缩小行为
     */
    public void shrink(){
        this.diameter /= 2;
        this.height /= 2;
    }
    
    public void move(){
        //wirte you code for moving the staff
    }
    public float getHeight() {
        return height;
    }
    public void setHeight(float height) {
        this.height = height;
    }
    public float getDiameter() {
        return diameter;
    }
    public void setDiameter(float diameter) {
        this.diameter = diameter;
    }
    
}

结果如下：

Monkey King's birth date=Fri Aug 14 07:37:04 CST 2020
Copy monkey's birth date=Fri Aug 14 07:37:04 CST 2020
Monkey King == Copy Monkey?false
Monkey King's Staff==Copy Monkey's Staff?false