用JAVA编写圆

代码如下：

import java.awt.Colorimport java.awt.Dimensionimport java.awt.Graphics import javax.swing.JFrameimport javax.swing.JPanel public class TestSw extends JFrame { public static void main(String[] args) { new TestSw()} public TestSw(){ super("Test")this.setSize(new Dimension(400,300))this.setContentPane(new Mypane())this.setVisible(true)this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)} class Mypane extends JPanel{ public void paint(Graphics g) { super.paint(g)g.setColor(Color.red)g.setXORMode(Color.white)g.drawArc(20, 20, 100, 100, 0, 360)///此方法将画一个直径100的圆.红色. } } }

import java.applet.Applet

import java.awt.Graphics

public class draw extends Applet{

public void paint(Graphics g){

g.drawOval(100,200,50,50)

或者将pain里面改为g.drawRoundRect(120,200,30,30,30,30)

也就是说drawOval和drawRoundRect都可以画圆.

public static void main(String[] args) {

JFrame f = new PaintovalFrame()

f.setVisible(true)

}

改成f.setVisible(true)试一下

---