第一个java小程序 applet 画一个圆 获取网页自定义的参数来输出

java文件代码：

import java.awt.*; import java.awt.geom.*; public class DrawCircle extends javax.swing.JApplet { int radius, x, y; Color color; public void init() { String inRadius = getParameter("radius"); String inX = getParameter("x"); String inY = getParameter("y"); String inColor = getParameter("color"); if (inRadius == null) radius = 100; if (inX == null) x = 110; if (inY == null) y = 110; if (inColor == null) color = Color.blue; try { radius = Integer.parseInt(inRadius); x = Integer.parseInt(inX); y = Integer.parseInt(inY); color = Color.decode(inColor); } catch (NumberFormatException e) { showStatus("Parameter error" + e.getMessage()); } } public void paint(Graphics screen) { Graphics2D screen2D = (Graphics2D)screen; screen2D.setColor(Color.white); screen2D.fillRect(0, 0, getSize().width, getSize().height); screen2D.setColor(color); Ellipse2D.Float circle = new Ellipse2D.Float(x, y, radius, radius); screen2D.fill(circle); } } 

用javac 编译下输出class文件，结合下面的网页输出。。

 

html代码：

This program requires a Java-enabled browser.