画正弦曲线

<script type="text/javascript"> google_ad_client = "pub-8800625213955058"; google_ad_slot = "0989131976"; google_ad_width = 336; google_ad_height = 280; // </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> //画正弦曲线程序 import java.applet. *; import java.awt.*; import java.awt.event.*; public class ko12_3 extends Applet implements ActionListener { int x,y; double a; Button bn1=new Button("Sin波形"); Button bn2=new Button("清除"); public void init() { add(bn1); add(bn2); bn1.addActionListener(this); bn2.addActionListener(this); } public void actionPerformed(ActionEvent e) { Graphics g=getGraphics(); if(e.getSource()==bn1) { for(x=0;x<=360;x =9) { a=Math.sin(x*Math. PI/180); y=(int)(80 40*a); g.drawString("*",x,y); } } if(e.getSource()==bn2) repaint(); } } //ko12_3.html <APPLET CODE="ko12.3class"width=280 height=160> </APPLET>