Draw a circle using the Java drawing class graphics

Code:

Package com.dikea.demo01;

Import java.awt.*;
Import javax.swing.*;
Java Drawing principle Public

class demo_01  extends JFrame {
	Mypanel MP = null;
	public static void Main (string[] args) {

		//TODO automatically generated method stub
		demo_01 demo01 = new demo_01 ();
	}
	
	Public demo_01 () {
		MP = new Mypanel ();
		This.add (MP);
		
		This.setsize (in);
		This.setdefaultcloseoperation (jframe.exit_on_close);
		This.setvisible (True);
	}


Defines a mypanel panel for drawing area
class Mypanel extends jpanel{//
	overlay JPanel
	//Graphics is an important class of drawings that can be understood as a brush
	public void Paint (Graphics g) {
		// 	1. Call the parent class function to complete the initialization task
		//	This sentence cannot be less
		super.paint (g);
		
		First draw a circle
		g.drawoval (+,);
	}

Run Effect chart: