简介：以对象来代表实际行动，命令对象可以把行动(action) 及其参数封装起来，这些行动可以被
- 重复多次
- 取消（如果该对象有实现的话）
- 取消后又再重做
目的：
总结：
组成：对象，行动
1，对象
package com.design.l.command;
/**
* 程序设计员
*/
public class Programmer {
private String userName;
public Programmer(String userName) {
super();
this.userName = userName;
}
public void handleDemand(){
System.out.println("程序员 : " + userName + " ,正在处理新需求 ... ...");
}
public void handleBug(){
System.out.println("程序员 : " + userName + " ,正在处理Bug ... ...");
}
public void handleProblem(){
System.out.println("程序员 : " + userName + " ,正在处理线上问题 ... ...");
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
package com.design.l.command;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* 产品经理
*/
public class ProductManager {
//任务集合
private List<TaskService> taskList;
//程序员
private List<Programmer> programmerList;
private static final int TASK_MAX_NUM = 4;//任务最大数量
private int idx = 0;
public ProductManager(Programmer ... programmers) {
super();
this.taskList = new ArrayList<>();
this.programmerList = Arrays.asList(programmers);
}
//新增任务
public void addTaskToProduct(TaskService taskService){
taskList.add(taskService);
}
//分配任务
public void assignments(){
TaskService[] copy = new TaskService[taskList.size() > TASK_MAX_NUM ? taskList.size() - TASK_MAX_NUM : 0];
for ( int i = 0; i < TASK_MAX_NUM && i < taskList.size(); i ++){
taskList.get(i).handle();
}
System.arraycopy(taskList.toArray(), TASK_MAX_NUM > taskList.size() ? taskList.size() : TASK_MAX_NUM, copy, 0, copy.length);
taskList = Arrays.asList(copy);
}
//获取程序员
public Programmer chooseProgrammer(){
return programmerList.get(idx == programmerList.size() ? 0 : idx ++);
}
//打印出未处理的任务
public void printTask(){
if(taskList == null || taskList.size() == 0){
System.out.println("----无任务----");
return ;
}
System.out.println("----剩余任务----");
for(TaskService task : taskList){
System.out.println(task);
}
}
}
package com.design.l.command;
/**
* 销售人员
*/
public class Sales {
private String userName;
private ProductManager productManager;//产品经理
public Sales(String userName) {
super();
this.userName = userName;
}
public Sales(String userName, ProductManager productManager) {
super();
this.userName = userName;
this.productManager = productManager;
}
public void putDemand(){
System.out.println("业务员 : " + userName + ", 提出新需求 ... ... ");
productManager.addTaskToProduct(new DemandTaskServiceImpl(productManager.chooseProgrammer()));
}
public void putBug(){
System.out.println("业务员 : " + userName + ", 提出新Bug ... ... ");
productManager.addTaskToProduct(new BugTaskServiceImpl(productManager.chooseProgrammer()));
}
public void putProblem(){
System.out.println("业务员 : " + userName + ", 提出线上问题 ... ... ");
productManager.addTaskToProduct(new ProblemTaskServiceImpl(productManager.chooseProgrammer()));
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public ProductManager getProductManager() {
return productManager;
}
public void setProductManager(ProductManager productManager) {
this.productManager = productManager;
}
}
2，行为
package com.design.l.command;
/**
* 任务接口
*/
public interface TaskService {
/**
* 任务处理方法
*/
void handle();
}
package com.design.l.command;
/**
* 新需求任务
*/
public class DemandTaskServiceImpl implements TaskService {
private Programmer programmer;
public DemandTaskServiceImpl(Programmer programmer) {
super();
this.programmer = programmer;
}
@Override
public void handle() {
programmer.handleDemand();
}
}
package com.design.l.command;
/**
* Bug任务
*/
public class BugTaskServiceImpl implements TaskService {
private Programmer programmer;
public BugTaskServiceImpl(Programmer programmer) {
super();
this.programmer = programmer;
}
@Override
public void handle() {
programmer.handleBug();
}
}
package com.design.l.command;
/**
* 线上问题任务
*/
public class ProblemTaskServiceImpl implements TaskService {
private Programmer programmer;
public ProblemTaskServiceImpl(Programmer programmer) {
super();
this.programmer = programmer;
}
@Override
public void handle() {
programmer.handleProblem();
}
}
3，Main
package com.design.l.command;
/**
* 12-命令模式
*/
public class MainTest {
public static void main(String[] args) {
Programmer programmerA = new Programmer("程序员A");
ProductManager productManager = new ProductManager(programmerA);
Sales salesA = new Sales("业务员A", productManager);
Sales salesB = new Sales("业务员B", productManager);
Sales salesC = new Sales("业务员C", productManager);
Sales salesD = new Sales("业务员D", productManager);
salesA.putDemand();
salesA.putBug();
salesB.putProblem();
salesC.putBug();
salesD.putProblem();
productManager.assignments();
productManager.printTask();
productManager.assignments();
productManager.printTask();
}
}
4，Result
业务员 : 业务员A, 提出新需求 ... ... 业务员 : 业务员A, 提出新Bug ... ... 业务员 : 业务员B, 提出线上问题 ... ... 业务员 : 业务员C, 提出新Bug ... ... 业务员 : 业务员D, 提出线上问题 ... ... 程序员 : 程序员A ,正在处理新需求 ... ... 程序员 : 程序员A ,正在处理Bug ... ... 程序员 : 程序员A ,正在处理线上问题 ... ... 程序员 : 程序员A ,正在处理Bug ... ... ----剩余任务---- [email protected] 程序员 : 程序员A ,正在处理线上问题 ... ... ----无任务----
时间： 2024-08-09 06:34:31