Antrenand-o Pe Tessa.pdf
Q:
I have a nullPOINTERException while doing lineclipping. Could anyone please tell me where the problem is?
I'm trying to do line clipping on a line (defined by coordinates) but I have a nullPointerException. Can someone please tell me where is the problem?
import java.awt.Graphics;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
public class LineClipper {
    private static BufferedImage image;
    public static BufferedImage getImage() {
        return image;
    }
    public static void createImage() {
        image = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
    public static void main(String[] args) throws InterruptedException {
        createImage();
        Line2D line = new Line2D.Double(100, 100, 300, 300);
        Point2D start = new Point2D.Double(100, 100);
        Point2D end = new Point2D.Double(200, 200);
        Graphics g = getImage().getGraphics();
        g.setClip(line);
        g.drawLine(start.getX(), start.getY(), end.getX(), end.getY());
        g.dispose();
        BufferedImage result = getImage();
        System.out.println(result);
}
A:
You never initialised your image variable.
public static BufferedImage getImage() {
    return image;
public static void createImage() {
    image = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
﻿
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