drawingcanvas.java

教给你如何将JavaApplet程序转化为JavaApplication程序的一个范例

// written by : Christine Amarra
// December 15, 2004

//To use swing and graphics components
import javax.swing.*;
import java.awt.*;

//To draw images
import javax.imageio.*;
import java.awt.image.*;

public class DrawingCanvas extends Canvas
{
	private BufferedImage image = null; //type for image
	
	public DrawingCanvas()
	{
		this.setBackground(Color.magenta);
		try
		{
			//load image
			image =	ImageIO.read(getClass().getResource("pic14343.gif"));
		}
		catch(Exception e){}
	}
	
	public void paint(Graphics g)
	{
		g.setColor(Color.yellow);
		g.fillOval(5,5,50,50);
		g.setColor(Color.blue);
		g.fillRect(25,25,100,100);

		//draw image on screen
		g.drawImage(image,45,45,null);
		// the last parameter is an ImageObserver, but we don't need one
	}
}