how to create circle

[neer]

hi i am neer
i am new to this forum.......and to java coding too.......
plz help me in creating a circle class with radius r, and class point which is the center of circle
Thanx
Neer

[Norm]

If you want to draw a circle, see the Graphics class. It has draw... methods that will draw a circle (an oval with width = height)

For your class, define a class with two variables.

[sjalle]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

/**
 * A Simple circle class with radius, location and color
 */

public class Circle {

  int r=0;
  Point location=new Point();
  Color color=Color.blue;

  // CONSTRUCTORS

  public Circle() {}
  public Circle(int r, Point location) {
    this.r=r;
    this.location=location;
  }
  public Circle(int r, Point location, Color color) {
    this(r,location);
    this.color=color;
  }

  /**
   * Draws the circle
   */
  public void draw(Graphics g) {
    Color c=g.getColor(); // save context color
    g.setColor(color);
    g.fillOval(location.x,location.y,r,r);
    g.setColor(Color.black);
    g.drawOval(location.x,location.y,r,r);
    g.setColor(c); // restore context color
  }
  /**
   * Main for testing
   */
  public static void main(String[] args) {
    JFrame f=new JFrame("Circle test");
    DrawPanel pan=new DrawPanel(); // make a drawingpanel
    f.getContentPane().setLayout(new GridLayout());
    f.getContentPane().add(pan);
    // add two circles
    pan.addCircle(new Circle(20,new Point(100,100),Color.orange));
    pan.addCircle(new Circle(100,new Point(300,200)));
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    f.setBounds(10,10,500,400);
    f.setVisible(true);
  }
}
/**
 * A panel extension for drawing circles
 */
class DrawPanel extends JPanel {
  ArrayList circleList=new ArrayList();
  public void addCircle(Circle aCircle) {
    circleList.add(aCircle);
  }
  public void paint (Graphics g) {
    update(g);
  }
  public void update(Graphics g) {
    for (int i=0; i<circleList.size(); i++) {
      Circle aCircle=(Circle)circleList.get(i);
      aCircle.draw(g);
    }
  }
}

[neer]

Thanx buddy
Your help is highly appreciated..........as i am beginer to java
can u plz give me one more lil favour.......
if u can send me the comments for the following block
/**
* A panel extension for drawing circles
*/
class DrawPanel extends JPanel {
ArrayList circleList=new ArrayList();
public void addCircle(Circle aCircle) {
circleList.add(aCircle);
}
public void paint (Graphics g) {
update(g);
}
public void update(Graphics g) {
for (int i=0; i<circleList.size(); i++) {
Circle aCircle=(Circle)circleList.get(i);
aCircle.draw(g);
}
}
}
Thanx in Advance
Neer

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

/**
 * A Simple circle class with radius, location and color
 */

public class Circle {

  int r=0;
  Point location=new Point();
  Color color=Color.blue;

  // CONSTRUCTORS

  public Circle() {}
  public Circle(int r, Point location) {
    this.r=r;
    this.location=location;
  }
  public Circle(int r, Point location, Color color) {
    this(r,location);
    this.color=color;
  }

  /**
   * Draws the circle
   */
  public void draw(Graphics g) {
    Color c=g.getColor(); // save context color
    g.setColor(color);
    g.fillOval(location.x,location.y,r,r);
    g.setColor(Color.black);
    g.drawOval(location.x,location.y,r,r);
    g.setColor(c); // restore context color
  }
  /**
   * Main for testing
   */
  public static void main(String[] args) {
    JFrame f=new JFrame("Circle test");
    DrawPanel pan=new DrawPanel(); // make a drawingpanel
    f.getContentPane().setLayout(new GridLayout());
    f.getContentPane().add(pan);
    // add two circles
    pan.addCircle(new Circle(20,new Point(100,100),Color.orange));
    pan.addCircle(new Circle(100,new Point(300,200)));
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    f.setBounds(10,10,500,400);
    f.setVisible(true);
  }
}
/**
 * A panel extension for drawing circles
 */
class DrawPanel extends JPanel {
  ArrayList circleList=new ArrayList();
  public void addCircle(Circle aCircle) {
    circleList.add(aCircle);
  }
  public void paint (Graphics g) {
    update(g);
  }
  public void update(Graphics g) {
    for (int i=0; i<circleList.size(); i++) {
      Circle aCircle=(Circle)circleList.get(i);
      aCircle.draw(g);
    }
  }
}

[sjalle]

Like the comment says: A panel extension for drawing circles. Check the
java doc on the use of the Component paint/update methods and using ArrayList