import java.awt.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
class Main {
    static final int X = 256, Y = 256;
    static BufferedImage I = new BufferedImage(X, Y, BufferedImage.TYPE_BYTE_GRAY);
 
    static public void main( String[] args ) {
        Frame f = new Frame( "paint Example" );
        f.add("Center", new MainCanvas());
        f.setSize(new Dimension(X,Y+22));
        for (int i = 0; i<X; ++i) for(int j=0; j<Y; ++j)
           I.setRGB(i, j, (i^j)*0x010101);
        f.setVisible(true);
        if(args.length > 0)
           try {ImageIO.write(I, "png", new File(args[0]));}
           catch (IOException e) {System.err.println("image not saved.");}

     for(int q=0; q < args.length; ++q) {
           int z = args[q].lastIndexOf('.');
           if (z > 0) try {ImageIO.write(
                I, args[q].substring(z+1),
                new File(args[q]));}
              catch (IOException e) {System.err.println("image not saved.");}
           else System.err.println(
             "Command line argument not a graphics file name");}}}
class MainCanvas extends Canvas{
    public void paint(Graphics g){
        g.drawImage(Main.I, 0, 0, Color.red, null);}}