深圳市建设工程网站,网页ui素材中心下载,百度网页首页,docker做网站一、模式定义用原型实例指定要创建对象的种类#xff0c;并通过拷贝这些原型创建新的对象。二、模式场景假设此处结合23中设计模式记忆篇作出假设#xff0c;不关心逻辑是否合理。柳岩在跳舞的时候烧伤了脸#xff0c;再也回不到原来的型状。他就克隆一张脸。类图如下#…一、模式定义用原型实例指定要创建对象的种类并通过拷贝这些原型创建新的对象。二、模式场景假设此处结合23中设计模式记忆篇作出假设不关心逻辑是否合理。柳岩在跳舞的时候烧伤了脸再也回不到原来的型状。他就克隆一张脸。类图如下三、代码实现1、创建一个类柳岩的脸package com.pattern.prototype;/*** 建立一个类代表柳岩的脸* author dgw**/public class LiuYanFace implements Cloneable{//脸的颜色private String color;public LiuYanFace(){//System.out.println(柳岩的脸);}public LiuYanFace(String color) {super();this.color color;}public String getColor() {return color;}public void setColor(String color) {this.color color;}//重新Object中的clone方法Overrideprotected LiuYanFace clone() throws CloneNotSupportedException {return (LiuYanFace) super.clone();}}2测试代码package com.pattern.prototype;import org.junit.Test;public class TestProtoType {Testpublic void testPrototype() throws CloneNotSupportedException{//创建100万对象需要 8.524s//int i0;//while(i1000000){//LiuYanFace liuYanFace new LiuYanFace();//i;//}//创建100万对象需要 8.220s//int i0;//LiuYanFace liuYanFace new LiuYanFace();//while(i1000000){//LiuYanFace clone liuYanFace.clone();//i;//}}}3、原型模式的注意事项1)潜克隆对应用对象不进行拷贝。package com.pattern.prototype;import java.util.Map;import org.junit.Test;public class TestProtoType {Testpublic void testPrototype() throws CloneNotSupportedException{//创建100万对象需要 8.524s//int i0;//while(i1000000){//LiuYanFace liuYanFace new LiuYanFace();//i;//}//创建100万对象需要 8.220s//int i0;//LiuYanFace liuYanFace new LiuYanFace();//while(i1000000){//LiuYanFace clone liuYanFace.clone();//i;//}//原型对象LiuYanFace liuYanFace new LiuYanFace(白的);//克隆对象LiuYanFace clone liuYanFace.clone();clone.setColor(黑的);//原型对象的颜色System.out.println(liuYanFace.getColor());//白的//克隆对象的颜色System.out.println(clone.getColor());//黑的//克隆对象的颜色System.out.println(liuYanFace.map);//{prototype白的}System.out.println(clone.map);//{prototype白的}//修改克隆对象的map中颜色clone.map.put(prototype, 黄的);//见鬼了吗怎么都改为黄色了哈哈这就是潜克隆。java偷懒了只克隆本对象其对象内的数组、引用对象(String除外)都不拷贝。System.out.println(liuYanFace.map);//黄的System.out.println(clone.map);//黄的}}2)深克隆深拷贝。package com.pattern.prototype;import java.util.HashMap;import java.util.Map;import java.util.UUID;/*** 建立一个类代表柳岩的脸* author dgw**/public class LiuYanFace implements Cloneable{public Map mapnew HashMap();//脸的颜色private String color;public LiuYanFace(){//System.out.println(柳岩的脸);}public LiuYanFace(String color) {super();this.color color;map.put(prototype, color);}public String getColor() {return color;}public void setColor(String color) {this.color color;}//重新Object中的clone方法SuppressWarnings(unchecked)Overrideprotected LiuYanFace clone(){LiuYanFace facenull;try {face(LiuYanFace) super.clone();//深度克隆//face.map(Map) ((HashMap) this.map).clone();} catch (CloneNotSupportedException e) {e.printStackTrace();}return face;}}package com.pattern.prototype;import java.util.Map;import org.junit.Test;public class TestProtoType {Testpublic void testPrototype() throws CloneNotSupportedException{//创建100万对象需要 8.524s//int i0;//while(i1000000){//LiuYanFace liuYanFace new LiuYanFace();//i;//}//创建100万对象需要 8.220s//int i0;//LiuYanFace liuYanFace new LiuYanFace();//while(i1000000){//LiuYanFace clone liuYanFace.clone();//i;//}//原型对象LiuYanFace liuYanFace new LiuYanFace(白的);//克隆对象LiuYanFace clone liuYanFace.clone();clone.setColor(黑的);//原型对象的颜色System.out.println(liuYanFace.getColor());//白的//克隆对象的颜色System.out.println(clone.getColor());//黑的//克隆对象的颜色System.out.println(liuYanFace.map);//{prototype白的}System.out.println(clone.map);//{prototype白的}//修改克隆对象的map中颜色clone.map.put(prototype, 黄的);System.out.println(liuYanFace.map);//白的System.out.println(clone.map);//黄的}}3)需要考培的属性不能使用final修饰。四、优缺点分析优点性能良好、在内存中二进制流的拷贝比new性能好。缺点在拷贝是构造函数不会执行减少了约束。
