/* * To change this template, choose Tools | Templates * and open the template in the editor. */package ui;import java.util.Scanner;import java.util.StringTokenizer;import java.util.Calendar;import logical.AgendaService;import exception.BadCommandException;/** * 這個方法是幫助命令的類，實現命令的解析和執行，另外輸出結果字符串 * @author zouhao */public class HelpCommand implements Command{    Scanner scanner;    boolean success;    Calendar cal;    int year;    AgendaService agenda;    /**     * 命令的構造函數     */    HelpCommand()    {        agenda = AgendaService.getInstance();        year=2008;        success=false;        cal=Calendar.getInstance();     }    /**     * 解析命令方法，如果命令不符合語法規則，拋出異常     * @param input 用于解析的命令輸入字符串     */    public void parse(String input){        scanner = new Scanner(input);        StringTokenizer tmp = new StringTokenizer(input);        try{            if(tmp.countTokens()!=1){throw new BadCommandException();}            if(!scanner.next().equals("help")){throw new BadCommandException();}                success = true;        }catch(BadCommandException e){}    }    /**     * 執行命令的方法，如果命令執行不成功，拋出異常     * @return 返回成功與否     */    public boolean Execute(){               if(success)        {            Show show = Show.getInstance();            show.Introduce();        }        return success;    }    /**     * 打印方法     * @return 結果字符串     */    public String ToString()    {        return agenda.ToString("Meeting");    }}