Dartboard Applet in Java

This tutorial teaches you how to create a dartboard applet in Java. It includes step-by-step instructions, code examples, and screenshots.

Part 1
import java.awt.Graphics;
import javax.swing.JApplet;
public class Dartboard extends JApplet {
int Diameter;
int NumberPoints;
int inputlines;
double angle;
public void init() {
final int input = Integer.parseInt(getParameter("Width"));
final int Lines = Integer.parseInt(getParameter("Lines"));
Diameter = input;
inputlines = Lines;
}
// draw shapes on applet's background
public void paint(Graphics g) {
super.paint(g); // call paint method inherited from JApplet
g.drawOval(0, 0,
Diameter, Diameter);
g.drawOval(((Diameter / 2) / 3), ((Diameter / 2) / 3),
((Diameter / 3) * 2), ((Diameter / 3) * 2));
// done processing case
g.drawOval((((Diameter / 2) / 3) * 2), (((Diameter / 2) / 3) * 2),
(Diameter / 3), (Diameter / 3));
//check if the number of passed lines is within the bounds of the
requirements
if (inputlines < 2 || inputlines > 30) {
NumberPoints = 20;
} else {
NumberPoints = inputlines;
}
//find the angle that is to be used for the lines
angle = 360 / (double) NumberPoints;
int i; //for loop statement
int x; // X coordinate
int y; //y coordinate
for (i = 0; i < NumberPoints; i++) {
// find line angle in radians
double w = (angle * i) * Math.PI / 180;
x = (int) ((Diameter / 2) * Math.cos(w));

y = (int) ((Diameter / 2) * Math.sin(w));
g.drawLine(x + (Diameter / 2), y + (Diameter / 2), (Diameter /
2), (Diameter / 2));
}
}
}
Design
Smiley Tennis Ball at the Ireland v Georgia game.
Code:
import java.awt.*;
import java.awt.Event.*;
import javax.swing.*;
public class Flag extends JPanel {
public static void main(String[] args){
JFrame f = new JFrame("Flag");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Flag fl = new Flag();
fl.setBackground(Color.WHITE);
f.add(fl);
f.setSize(500, 270);
f.setVisible(true);
}
public void paintComponent(Graphics g){
super.paintComponent(g);
this.setBackground(Color.WHITE);

g.setColor(Color.GREEN);
g.fill3DRect(10, 10, 100, 50, true);
g.setColor(Color.WHITE);
g.fill3DRect(110, 10, 100, 50, true);
g.setColor(Color.ORANGE);
g.fill3DRect(210, 10, 100, 50, true);
g.setColor(Color.YELLOW);
g.fillOval(100,100,100,100);
g.setColor(Color.BLACK);
g.fillOval(120,125,20,20);
g.fillOval(160,125,20,20);
g.drawLine(150,165,150,150);
g.drawArc(110,106,80,90,-30,-120);
}
}
Screenshot