Question

用Java编写applet程序画圆

Answer 1

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.

Answer 2

用drawOval,要想半径为r,要这样写g.drawOval(x,y,2r,2r);

Answer 3

public static void circle(int r) {
int x;
int rr = r * r;
for (int y = r; y >= -r; y--) {
x = (int) (Math.sqrt(rr - y * y));
show(r, x);
}
}

public static void show(int r, int x) {
for (int i = -r; i < -x; i++) {
System.out.print(" ");
}
System.out.print("*");
if (x > 0) {
for (int i = -x+1; i < x; i++) {
System.out.print(" ");
}
System.out.print("*");
}
System.out.println();
}
这个应该可以

Answer 4

这不难吧，你没学过java？你只要定位个坐标半径就可以了，