Careercup

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
        }
    }
}