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<td height="20" align="center"><font color="#FFFFFF">==<b>開發教室==</b></font></td>
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<p align="center"><span class="title">Java Applet 入門</span></p>
<p align="right"><a href="mailto:yy435@263.net">yy435</a></p>
<p align="right">太平洋網絡學院</p>
<p align="center" class="green">第五天</p>
<p align="center" class="green">一個時鐘的例子</p>
<table width="15%" border="1">
<tr bordercolor="#ff6666">
<td><applet
code=Applet1.class
name=Applet1
width=204
height=204 >
</applet></td>
</tr>
</table>
<p>源代碼如下：</p>
<pre>
import java.awt.*;
import java.applet.*;
import java.util.Date; <font color="#0033CC"> //這是Java中的低級實用工具包，可以處理時間等內容。</font>
public class Applet1 extends Applet implements Runnable <font color="#0033CC"> //有線程運行接口</font>
{
Date timenow; //Date是一個時間定義與創建函數.
Clock myClock; //用戶自定義的類
Thread clockthread=null; //設置一個線程
public void start() //線程開始的類
{
if (clockthread==null)<font color="#0033CC"> //如果線程為空，則</font>
{
clockthread=new Thread (this); //開始新的線程
clockthread.start(); //開始
}
}
public void stop() <font color="#0033CC"> //終止線程</font>
{
clockthread.stop(); //終止線程，使它
clockthread=null; //為空
}
public void run() //運行線程
{
while(true) //一個死循環，條件永遠都是真的。
{
repaint(); //重新繪制界面
try{Thread.sleep(1000);} //讓線程沉睡1000毫秒，也就是一秒鐘
catch(InterruptedException e){} //捕獲異常（也就是錯誤）
}
}
public void paint(Graphics g)
{
timenow=new Date(); //新的時間的獲得
//獲得小時，分鐘，秒鐘
myClock=new Clock(timenow.getHours (),
timenow.getMinutes (),
timenow.getSeconds ());
g.drawString(timenow.toString(),25,240);//將它打印出來！
myClock.show(g,100,100,100); //使面板顯示
}
}
class Clock //用戶自定義的類開始，編譯后，它單獨成為一個CLASS文件
{
Clock(int hrs,int min,int sec) <font color="#0033CC"> //類函數入口</font>
{
hour=hrs%12; //將原始數據處理，得到小時
minute=min; //將原始數據處理，得到分鐘
second=sec; //將原始數據處理，得到小時
}
void show(Graphics g,int cx,int cy,int rad) //重新定義SHOW函數
{
int hrs_len=(int)(rad*0.5), //時針的長度
min_len=(int)(rad*0.6),<font color="#0033CC"> //分鐘的長度</font>
sec_len=(int)(rad*0.9); //秒鐘的長度
double theta;
//畫出鐘面
g.drawOval(cx-rad,cy-rad,rad*2,rad*2);
//畫出時針
theta=(double)(hour*60*60+minute*60+second)/43200.0*2.0*Math.PI ;
drawNiddle(g,Color.blue,cx,cy,hrs_len,theta);
//畫出分針
theta=(double)(minute*60+second)/3600.0*2.0*Math.PI ;
drawNiddle(g,Color.red,cx,cy,sec_len,theta);
//畫出秒針
theta=(double)(second)/60.0*2.0*Math.PI ;
drawNiddle(g,Color.green ,cx,cy,sec_len,theta);
}
private void drawNiddle(Graphics g,Color c,int x,int y,int len,double theta)
{
int ex=(int)(x+len*Math.sin(theta));
int ey=(int)(y-len*Math.cos(theta));
g.setColor (c);
g.drawLine(x,y,ex,ey);
}
int hour,minute,second;
}
</pre>
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