Careercup - Microsoft面试题 - 6314866323226624

2014-05-11 05:29

题目链接

原题：

Design remote controller for me.

题目：设计一个遥控器。

解法：遥控什么？什么遥控？传统的红外线信号吗？我只能随便说说思路吧。不知道这算什么类型的面试题，真遇到的话也算是倒了霉了。想了半天恍然大悟：原来是考察设计模式。查了相关资料后发现命令模式比较符合题意，所以就依葫芦画瓢写了个例子。

代码：

 // http://www.careercup.com/question?id=6366101810184192
 interface ICommand {
     public abstract void execute();
 }

 public class PowerOnCommand implements ICommand {
     @Override
     public void execute() {
         // TODO Auto-generated method stub
         System.out.println("Power on.");
     }

 }

 public class PowerOffCommand implements ICommand {
     @Override
     public void execute() {
         // TODO Auto-generated method stub
         System.out.println("Power off.");
     }
 }

 import java.util.Vector;

 public class RemoteController {
     private Vector<ICommand> buttons;
     private String[] configuration = {"PowerOnCommand", "PowerOffCommand"};

     public RemoteController() {
         // TODO Auto-generated constructor stub
         buttons = new Vector<ICommand>();
         for (String commandType : configuration) {
             try {
                 try {
                     buttons.add((ICommand) Class.forName(commandType).newInstance());
                 } catch (InstantiationException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 } catch (IllegalAccessException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             } catch (ClassNotFoundException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }
     }

     public void push(int commandIndex) {
         try {
             buttons.elementAt(commandIndex).execute();
         } catch (ArrayIndexOutOfBoundsException e) {
             // TODO: handle exception
         }
     }
 }