import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;

//闹钟

public class AlarmApplet extends Applet implements Runnable{
   
    /**@author ff
     *
     */
    private static final long serialVersionUID = 8416170666084415800L;
    TextField tfHour,tfMinute,tfSecond,tfNowHour,tfNowMinute,tfNowSecond; //显示和输入信息的文本域
    Button btStart,btStop; //打开和关闭闹钟按钮
    Thread alarm; //闹钟线程
    boolean turnOn; //是否打开
   
    public void init(){
        turnOn=true; //初始化参数
        
        Panel panel2=new Panel(); //实例化面板
        Panel panel3=new Panel();
        Panel panel4=new Panel();
        tfHour=new TextField(1); //增加组件到面板上
        tfMinute=new TextField(1);
        tfSecond=new TextField(1);
        tfNowHour=new TextField(1);
        tfNowMinute=new TextField(1);
        tfNowSecond=new TextField(1);
        btStart=new Button("开");
        btStop=new Button("关");   
        
        panel2.add(new Label("当前时间："));
        panel2.add(tfNowHour);
        panel2.add(new Label("时"));
        panel2.add(tfNowMinute);
        panel2.add(new Label("分"));
        panel2.add(tfNowSecond);
        panel2.add(new Label("秒"));
        panel3.add(new Label("闹钟时间："));               
        panel3.add(tfHour);
        panel3.add(new Label("时"));
        panel3.add(tfMinute);
        panel3.add(new Label("分"));
        panel3.add(tfSecond);
        panel3.add(new Label("秒"));

        panel4.add(new Label("闹钟设置"));
        panel4.add(btStart);
        panel4.add(btStop);
        
        add(panel2); //增加组件到Applet上
        add(panel3);
        add(panel4);
         
        btStart.addActionListener(new ActionListener(){  //打开闹钟按钮事件处理
            public void actionPerformed(ActionEvent event){
                turnOn=true; //设置打开标志为True
            }
        });
        
        btStop.addActionListener(new ActionListener(){  //关闭闹钟按钮事件处理
            public void actionPerformed(ActionEvent event){
                turnOn=false; //设置打开标志为false
            }
        });   
    }
   
   
    public void run(){
        while (alarm!=null){
            try{
                Thread.sleep(1000); //线程休眠一秒
            }
            catch (InterruptedException ex){
            }
            runAlarm(); //运行闹钟
        }
        
    }

    private void runAlarm(){
        Calendar now=new GregorianCalendar();    //得到日历对象
        int hour=now.get(Calendar.HOUR_OF_DAY); //得到小时数
        int minute=now.get(Calendar.MINUTE);   //得到分数
        int second=now.get(Calendar.SECOND);   //得到分数
        
        tfNowHour.setText(Integer.toString(hour)); //更新时间显示文本域
        tfNowMinute.setText(Integer.toString(minute));
        tfNowSecond.setText(Integer.toString(second));
        if (turnOn){ //如果闹钟是打开的
            int alarmHour=-1,alarmMinute=-1;
            String time=tfHour.getText(); //得到设置的闹钟小时数
            if (time!=null && !time.equals(""))
                alarmHour=Integer.parseInt(time);
            time=tfMinute.getText();
            if (time!=null && !time.equals(""))  //得到设置的闹钟分钟数
                alarmMinute=Integer.parseInt(time);        
            
            if (alarmHour!=-1 && alarmMinute!=-1){            
                if (hour==alarmHour){  //比较时间
                    if (minute==alarmMinute){
                        AudioClip sound=getAudioClip(getDocumentBase(),"Rain.wav");  //取得声音文件
                        sound.play(); //播放声音
                        turnOn=false;
                    
                    }
                }
            }
        }
    }
   
    public void start(){
        if (alarm==null){
            alarm=new Thread(this);  //实例化线程
            alarm.start(); //运行线程
        }
   
    }