老板：阿飞，咱们公司又接了个新项目，一个客户，，卧室和客厅很大，电灯电视开关也不好找，所以希望制造一个遥控器来控制一些家具的开启与关闭，目前需要5个按键，卧室的灯，卧室的电视，客厅的灯，客厅的电视，在留一个预备按键。我等会把需求文档给你。
项目组长阿飞：好的，老板
项目组长阿飞：小三，来了个需求，你看下，你先设计一下架构
阿三：好的，飞哥
三天过后：飞哥，好了，你看下
先设计了一个接口，里面包含了，每一个按钮的统一行为
我要评论
1 package com.commandpattern.command;
2
3 /**
4 * @program: testpattern
5 * @description: 命令接口
6 * @author: mr.yang
7 * @create: 2018-12-08 13:54
8 **/
9 public interface command {
10
11 //执行方法
12 public void exceute();
13
14 }
然后建立了一个对象，代表了空对象，什么操作也不执行
package com.commandpattern.command.nullcommand;
import com.commandpattern.command.command;
/**
* @program: testpattern
* @description: 建立一个空对象，在许多设计模式种，都会看到空对象的使用，甚至有些时候，空对象本身也被视为一种设计模式
* @author: mr.yang
* @create: 2018-12-08 17:40
**/
public class nullcommand implements command {
public void exceute() {
system.out.println("什么都不做处理");
}
}
灯的具体类
package com.commandpattern.entity;
/**
* @program: testpattern
* @description: 灯的具体类
* @author: mr.yang
* @create: 2018-12-08 17:31
**/
public class lamp {
private string name;
/**
* name为灯的具体装饰，即为哪里的灯
* @param name
*/
public lamp(string name){
this.name=name;
}
public void on (){
system.out.println(name+"_灯打开");
}
public void off (){
system.out.println(name+"_灯关闭");
}
}
电视的具体类
package com.commandpattern.entity;
/**
* @program: testpattern
* @description: 电视的具体类
* @author: mr.yang
* @create: 2018-12-08 17:35
**/
public class tv {
private string name;
public tv(string name){
this.name=name;
}
public void on (){
system.out.println(name+"_电视打开");
}
public void off(){
system.out.println(name+"_电视关闭");
}
}
关闭灯的具体命令
package com.commandpattern.command.off;
import com.commandpattern.command.command;
import com.commandpattern.entity.lamp;
/**
* @program: testpattern
* @description: 灯关闭
* @author: mr.yang
* @create: 2018-12-08 17:33
**/
public class lampoffcommand implements command {
lamp lamp;
public lampoffcommand(lamp lamp){
this.lamp=lamp;
}
//灯关闭
public void exceute() {
lamp.off();
}
}
打开灯的具体命令
package com.commandpattern.command.on;
import com.commandpattern.command.command;
import com.commandpattern.entity.lamp;
/**
* @program: testpattern
* @description: 灯打开的命令
* @author: mr.yang
* @create: 2018-12-08 17:29
**/
public class lamponcommand implements command {
lamp lamp;
public lamponcommand(lamp lamp){
this.lamp=lamp;
}
//灯打开的命令
public void exceute() {
lamp.on();
}
}
电视关闭的具体命令
package com.commandpattern.command.off;
import com.commandpattern.command.command;
import com.commandpattern.entity.tv;
/**
* @program: testpattern
* @description: 电视关闭
* @author: mr.yang
* @create: 2018-12-08 17:36
**/
public class tvoffcommand implements command {
tv tv;
public tvoffcommand(tv tv){
this.tv=tv;
}
public void exceute() {
tv.off();
}
}
电视打开的具体命令
package com.commandpattern.command.on;
import com.commandpattern.command.command;
import com.commandpattern.entity.tv;
/**
* @program: testpattern
* @description: 电视打开
* @author: mr.yang
* @create: 2018-12-08 17:37
**/
public class tvoncommand implements command {
tv tv;
public tvoncommand(tv tv){
this.tv=tv;
}
public void exceute() {
tv.on();
}
}
建立一个遥控器
package com.commandpattern.control;
import com.commandpattern.command.command;
import com.commandpattern.command.nullcommand.nullcommand;
import java.util.arrays;
/**
* @program: testpattern
* @description: 遥控器
* @author: mr.yang
* @create: 2018-12-08 17:39
**/
public class remotecontrol {
command[] oncommand;
command[] offcommand;
//初始化每个操作为空操作
public remotecontrol(){
oncommand=new command[5];
offcommand=new command[5];
nullcommand nullcommand = new nullcommand();
for (int i = 0; i < 5; i++) {
oncommand[i]=nullcommand;
offcommand[i]=nullcommand;
}
}
public void setcommond(int index,command oncommand,command offcommand){
this.offcommand[index]=offcommand;
this.oncommand[index]=oncommand;
}
public void clickon(int index){
oncommand[index].exceute();
}
public void clickoff(int index){
offcommand[index].exceute();
}
/**
* 输出每个按钮的具体代表类
* @return
*/
@override
public string tostring() {
stringbuffer sb = new stringbuffer();
for (int i = 0; i < oncommand.length; i++) {
sb.append("[index : "+i+"] ");
sb.append(oncommand[i].getclass().getname());
sb.append(" ");
sb.append(offcommand[i].getclass().getname());
sb.append("\r\n");
}
return sb.tostring();
}
}
测试类
1 package com.commandpattern.testpattern;
2
3 import com.commandpattern.command.off.lampoffcommand;
4 import com.commandpattern.command.off.tvoffcommand;
5 import com.commandpattern.command.on.lamponcommand;
6 import com.commandpattern.command.on.tvoncommand;
7 import com.commandpattern.control.remotecontrol;
8 import com.commandpattern.entity.lamp;
9 import com.commandpattern.entity.tv;
10
11 /**
12 * @program: test
13 * @description:
14 * @author: mr.yang
15 * @create: 2018-12-08 17:48
16 **/
17 public class testpattern {
18 public static void main(string[] args) {
19 remotecontrol remotecontrol = new remotecontrol();
20
21 /**
22 * 创建装置到合适位置
23 */
24 tv bedroomtv = new tv("卧室");
25 tv drawitv = new tv("客厅");
26
27 lamp bedroomlamp = new lamp("卧室");
28 lamp drawilamp = new lamp("客厅");
29
30 /**
31 * 创建所有命令操作对象
32 */
33 //卧室灯关闭对象
34 lampoffcommand bedlampoffcommand = new lampoffcommand(bedroomlamp);
35 //卧室灯打开对象
36 lamponcommand bedlamponcommand = new lamponcommand(bedroomlamp);
37 //卧室tv关闭对象
38 tvoffcommand bedtvoffcommand = new tvoffcommand(bedroomtv);
39 //卧室tv打开对象
40 tvoncommand bedtvcommand = new tvoncommand(bedroomtv);
41 //客厅灯打开对象
42 lamponcommand drawlamponcommand = new lamponcommand(drawilamp);
43 //客厅灯关闭对象
44 lampoffcommand drawlampoffcommand = new lampoffcommand(drawilamp);
45 //客厅tv关闭对象
46 tvoffcommand drawtvoffcommand = new tvoffcommand(drawitv);
47 //客厅tv打开对象
48 tvoncommand drawtvoncommand = new tvoncommand(drawitv);
49
50 system.out.println("---------------------------------------------未赋值之前------------------------------------------------");
51 system.out.println(remotecontrol);
52 system.out.println("******************************************************************************************************");
53
54 /**
55 * //将操作对象与卡槽一一对应
56 */
57 //赋值卧室灯打开与关闭
58 remotecontrol.setcommond(0,bedlamponcommand,bedlampoffcommand);
59 //赋值卧室tv打开与关闭
60 remotecontrol.setcommond(1,bedtvcommand,bedtvoffcommand);
61 //赋值客厅灯打开与关闭
62 remotecontrol.setcommond(2,drawlamponcommand,drawlampoffcommand);
63 //赋值客厅tv打开与关闭
64 remotecontrol.setcommond(3,drawtvoncommand,drawtvoffcommand);
65
66 system.out.println("---------------------------------------------赋值之后------------------------------------------------");
67 system.out.println(remotecontrol);
68 system.out.println("******************************************************************************************************");
69
70
71 /**
72 * 测试每一个按钮
73 */
74 remotecontrol.clickon(0);
75 remotecontrol.clickoff(0);
76
77 remotecontrol.clickon(1);
78 remotecontrol.clickoff(1);
79
80 remotecontrol.clickon(2);
81 remotecontrol.clickoff(2);
82
83 remotecontrol.clickon(3);
84 remotecontrol.clickoff(3);
85
86
87 }
88 }
测试结果
---------------------------------------------未赋值之前------------------------------------------------ [index : 0] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 1] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 2] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 3] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 4] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand ****************************************************************************************************** ---------------------------------------------赋值之后------------------------------------------------ [index : 0] com.commandpattern.command.on.lamponcommand com.commandpattern.command.off.lampoffcommand [index : 1] com.commandpattern.command.on.tvoncommand com.commandpattern.command.off.tvoffcommand [index : 2] com.commandpattern.command.on.lamponcommand com.commandpattern.command.off.lampoffcommand [index : 3] com.commandpattern.command.on.tvoncommand com.commandpattern.command.off.tvoffcommand [index : 4] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand ****************************************************************************************************** 卧室_灯打开 卧室_灯关闭 卧室_电视打开 卧室_电视关闭 客厅_灯打开 客厅_灯关闭 客厅_电视打开 客厅_电视关闭
阿三：飞哥，我这里使用的设计模式-命令模式，
将动作执行（lamponcommand，tvoncommand……）与接收者（lamp，tv）包装到对象里面，对外暴露的只有一个command接口中的execute方法，其他对象不需要知道那个接收者执行了什么动作，只需要知道调用execute，就能完成一个请求的操作，这个对象，与其他对象没有关联，完全解耦和，如果需要做新增，不需要修改原有代码，拓展接收者类和动作执行类，就能实现功能。
项目组长阿飞：不错，不错，进步很大。
项目组长阿飞：第5个按钮可能需要做一个恢复上一步动作的效果，类似于ctrl+z这个效果，你再改改把。
阿三：好的。
阿三：飞哥修改好了，你看下
命令接口新增撤销方法
package com.commandpattern.command;
/**
* @program: testpattern
* @description: 命令接口
* @author: mr.yang
* @create: 2018-12-08 13:54
**/
public interface command {
//执行方法
public void exceute();
//撤销方法
public void revoke();
}
建立一个空对象,实现了撤销方法
package com.commandpattern.command.nullcommand;
import com.commandpattern.command.command;
/**
* @program: testpattern
* @description: 建立一个空对象，在许多设计模式种，都会看到空对象的使用，甚至有些时候，空对象本身也被视为一种设计模式
* @author: mr.yang
* @create: 2018-12-08 17:40
**/
public class nullcommand implements command {
public void exceute() {
system.out.println("什么都不做处理");
}
public void revoke() {
system.out.println("什么都不做处理");
}
}
灯关闭实现了撤销方法
package com.commandpattern.command.off;
import com.commandpattern.command.command;
import com.commandpattern.entity.lamp;
/**
* @program: testpattern
* @description: 灯关闭
* @author: mr.yang
* @create: 2018-12-08 17:33
**/
public class lampoffcommand implements command {
lamp lamp;
public lampoffcommand(lamp lamp){
this.lamp=lamp;
}
//灯关闭
public void exceute() {
lamp.off();
}
//执行到这个具体实现类，代表上一步是灯关闭，撤销操作即为灯打开
public void revoke() {
lamp.on();
}
}
灯打开实现了撤销方法
package com.commandpattern.command.on;
import com.commandpattern.command.command;
import com.commandpattern.entity.lamp;
/**
* @program: testpattern
* @description: 灯打开的命令
* @author: mr.yang
* @create: 2018-12-08 17:29
**/
public class lamponcommand implements command {
lamp lamp;
public lamponcommand(lamp lamp){
this.lamp=lamp;
}
//灯打开的命令
public void exceute() {
lamp.on();
}
//执行到这个具体实现类，代表上一步是灯打开，撤销操作即为灯关闭
public void revoke() {
lamp.off();
}
}
电视关闭实现了撤销方法
package com.commandpattern.command.off;
import com.commandpattern.command.command;
import com.commandpattern.entity.tv;
/**
* @program: testpattern
* @description: 电视关闭
* @author: mr.yang
* @create: 2018-12-08 17:36
**/
public class tvoffcommand implements command {
tv tv;
public tvoffcommand(tv tv){
this.tv=tv;
}
public void exceute() {
tv.off();
}
//执行到这个具体实现类，代表上一步是电视关闭，撤销操作即为电视打开
public void revoke() {
tv.on();
}
}
电视打开实现了撤销方法
package com.commandpattern.command.on;
import com.commandpattern.command.command;
import com.commandpattern.entity.tv;
/**
* @program: testpattern
* @description: 电视打开
* @author: mr.yang
* @create: 2018-12-08 17:37
**/
public class tvoncommand implements command {
tv tv;
public tvoncommand(tv tv){
this.tv=tv;
}
public void exceute() {
tv.on();
}
//执行到这个具体实现类，代表上一步是电视打开，撤销操作即为电视关闭
public void revoke() {
tv.off();
}
}
遥控器类，新增变量记录上一步操作
package com.commandpattern.control;
import com.commandpattern.command.command;
import com.commandpattern.command.nullcommand.nullcommand;
import java.util.arrays;
/**
* @program: testpattern
* @description: 遥控器
* @author: mr.yang
* @create: 2018-12-08 17:39
**/
public class remotecontrol {
command[] oncommand;
command[] offcommand;
//这个变量来记录上一个命令
command upstepcommand;
//初始化每个操作为空操作
public remotecontrol(){
oncommand=new command[5];
offcommand=new command[5];
nullcommand nullcommand = new nullcommand();
for (int i = 0; i < 5; i++) {
oncommand[i]=nullcommand;
offcommand[i]=nullcommand;
}
upstepcommand=nullcommand;
}
public void setcommond(int index,command oncommand,command offcommand){
this.offcommand[index]=offcommand;
this.oncommand[index]=oncommand;
}
//新增upstepcommand记录上一步命令
public void clickon(int index){
oncommand[index].exceute();
upstepcommand=oncommand[index];
}
//新增upstepcommand记录上一步命令
public void clickoff(int index){
offcommand[index].exceute();
upstepcommand=offcommand[index];
}
public void toupstepclick(){
system.out.println("---撤销---");
upstepcommand.revoke();
}
/**
* 输出每个按钮的具体代表类
* @return
*/
@override
public string tostring() {
stringbuffer sb = new stringbuffer();
for (int i = 0; i < oncommand.length; i++) {
sb.append("[index : "+i+"] ");
sb.append(oncommand[i].getclass().getname());
sb.append(" ");
sb.append(offcommand[i].getclass().getname());
sb.append("\r\n");
}
return sb.tostring();
}
}
测试类新增撤销测试
package com.commandpattern.testpattern;
import com.commandpattern.command.off.lampoffcommand;
import com.commandpattern.command.off.tvoffcommand;
import com.commandpattern.command.on.lamponcommand;
import com.commandpattern.command.on.tvoncommand;
import com.commandpattern.control.remotecontrol;
import com.commandpattern.entity.lamp;
import com.commandpattern.entity.tv;
/**
* @program: test
* @description:
* @author: mr.yang
* @create: 2018-12-08 17:48
**/
public class testpattern {
public static void main(string[] args) {
remotecontrol remotecontrol = new remotecontrol();
/**
* 创建装置到合适位置
*/
tv bedroomtv = new tv("卧室");
tv drawitv = new tv("客厅");
lamp bedroomlamp = new lamp("卧室");
lamp drawilamp = new lamp("客厅");
/**
* 创建所有命令操作对象
*/
//卧室灯关闭对象
lampoffcommand bedlampoffcommand = new lampoffcommand(bedroomlamp);
//卧室灯打开对象
lamponcommand bedlamponcommand = new lamponcommand(bedroomlamp);
//卧室tv关闭对象
tvoffcommand bedtvoffcommand = new tvoffcommand(bedroomtv);
//卧室tv打开对象
tvoncommand bedtvcommand = new tvoncommand(bedroomtv);
//客厅灯打开对象
lamponcommand drawlamponcommand = new lamponcommand(drawilamp);
//客厅灯关闭对象
lampoffcommand drawlampoffcommand = new lampoffcommand(drawilamp);
//客厅tv关闭对象
tvoffcommand drawtvoffcommand = new tvoffcommand(drawitv);
//客厅tv打开对象
tvoncommand drawtvoncommand = new tvoncommand(drawitv);
system.out.println("---------------------------------------------未赋值之前------------------------------------------------");
system.out.println(remotecontrol);
system.out.println("******************************************************************************************************");
/**
* //将操作对象与卡槽一一对应
*/
//赋值卧室灯打开与关闭
remotecontrol.setcommond(0,bedlamponcommand,bedlampoffcommand);
//赋值卧室tv打开与关闭
remotecontrol.setcommond(1,bedtvcommand,bedtvoffcommand);
//赋值客厅灯打开与关闭
remotecontrol.setcommond(2,drawlamponcommand,drawlampoffcommand);
//赋值客厅tv打开与关闭
remotecontrol.setcommond(3,drawtvoncommand,drawtvoffcommand);
system.out.println("---------------------------------------------赋值之后------------------------------------------------");
system.out.println(remotecontrol);
system.out.println("******************************************************************************************************");
/**
* 测试每一个按钮
*/
remotecontrol.clickon(0);
remotecontrol.clickoff(0);
//撤销一次
remotecontrol.toupstepclick();
system.out.println("\r\n");
//撤销一次
remotecontrol.toupstepclick();
system.out.println("\r\n");
remotecontrol.clickon(1);
remotecontrol.clickoff(1);
//撤销一次
remotecontrol.toupstepclick();
system.out.println("\r\n");
remotecontrol.clickon(2);
remotecontrol.clickoff(2);
//撤销一次
remotecontrol.toupstepclick();
system.out.println("\r\n");
remotecontrol.clickon(3);
remotecontrol.clickoff(3);
//撤销一次
remotecontrol.toupstepclick();
system.out.println("\r\n");
}
}
修改之后的测试结果
---------------------------------------------未赋值之前------------------------------------------------ [index : 0] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 1] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 2] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 3] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand [index : 4] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand ****************************************************************************************************** ---------------------------------------------赋值之后------------------------------------------------ [index : 0] com.commandpattern.command.on.lamponcommand com.commandpattern.command.off.lampoffcommand [index : 1] com.commandpattern.command.on.tvoncommand com.commandpattern.command.off.tvoffcommand [index : 2] com.commandpattern.command.on.lamponcommand com.commandpattern.command.off.lampoffcommand [index : 3] com.commandpattern.command.on.tvoncommand com.commandpattern.command.off.tvoffcommand [index : 4] com.commandpattern.command.nullcommand.nullcommand com.commandpattern.command.nullcommand.nullcommand ****************************************************************************************************** 卧室_灯打开 卧室_灯关闭 ---撤销--- 卧室_灯打开 ---撤销--- 卧室_灯打开 卧室_电视打开 卧室_电视关闭 ---撤销--- 卧室_电视打开 客厅_灯打开 客厅_灯关闭 ---撤销--- 客厅_灯打开 客厅_电视打开 客厅_电视关闭 ---撤销--- 客厅_电视打开
项目组长阿飞：不错，不错，以后给你涨工资。
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