Ich probiere gerade ein wenich rum und habe bei diesen beiden classen folgenden fehler und verstehe nicht wiso:
Code:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at rtype.Board.actionPerformed(Board.java:150)
at javax.swing.Timer.fireActionPerformed(Unknown Source)
at javax.swing.Timer$DoPostEvent.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Java:
package rtype;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import javax.swing.JPanel;
import javax.swing.Timer;
import rtype.Wall;
public class Board extends JPanel implements ActionListener {
/**
*
*/
private final int OFFSET = 0;
private final int SPACE = 16;
private final int LEFT_COLLISION = 1;
private final int RIGHT_COLLISION = 2;
private final int TOP_COLLISION = 3;
private final int BOTTOM_COLLISION = 4;
private static final long serialVersionUID = 1L;
private Timer timer;
private Craft craft;
private Wall wall;
private boolean ingame;
private int B_WIDTH;
private int B_HEIGHT;
private int scoor;
private ArrayList walls = new ArrayList();
private int w = 0;
private int h = 0;
private String level =
" \n"
+ " \n"
+ " \n"
+ " \n"
+ " \n"
+ " \n"
+ " \n"
+ " \n"
+ " \n"
+ "@ \n"
+ "################################################\n";
public Board() {
addKeyListener(new TAdapter());
setFocusable(true);
setBackground(Color.WHITE);
setDoubleBuffered(true);
ingame = true;
setSize(400, 300);
timer = new Timer(5, this);
timer.start();
int x = OFFSET;
int y = OFFSET;
for (int i = 0; i < level.length(); i++) {
char item = level.charAt(i);
if (item == '\n') {
y += SPACE;
if (this.w < x) {
this.w = x;
}
x = OFFSET;
} else if (item == '#') {
wall = new Wall(x, y);
walls.add(wall);
x += SPACE;
} else if (item == '@') {
craft = new Craft(x, y);
x += SPACE;
} else if (item == ' ') {
x += SPACE;
}
h = y;
}
}
public void addNotify() {
super.addNotify();
B_WIDTH = getWidth();
B_HEIGHT = getHeight();
}
public void paint(Graphics g) {
super.paint(g);
if (ingame) {
Graphics2D g2d = (Graphics2D)g;
for (int i = 0; i < walls.size(); i++) {
Wall wall = (Wall) walls.get(i);
g.drawImage(wall.getImage(), wall.getX(), wall.getY(), this);
}
if (craft.isVisible())
g2d.drawImage(craft.getImage(), craft.getX(), craft.getY(),
this);
g2d.setColor(Color.WHITE);
g2d.drawString("Scoor: " + (scoor), 5, 15);
} else {
String msg = "Game Over Scoor: "+scoor+"";
Font small = new Font("Helvetica", Font.BOLD, 14);
FontMetrics metr = this.getFontMetrics(small);
g.setColor(Color.white);
g.setFont(small);
g.drawString(msg, (B_WIDTH - metr.stringWidth(msg)) / 2,
B_HEIGHT / 2);
}
Toolkit.getDefaultToolkit().sync();
g.dispose();
}
public void actionPerformed(ActionEvent e) {
craft.move();
repaint();
}
private class TAdapter extends KeyAdapter {
public void keyReleased(KeyEvent e) {
craft.keyReleased(e);
}
public void keyPressed(KeyEvent e) {
craft.keyPressed(e);
}
}
}
Java:
package rtype;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import javax.swing.ImageIcon;
public class Craft {
private String craft = "craft.png";
private int dx;
private int dy;
private int x;
private int y;
private int width;
private int height;
private boolean visible;
private Image image;
public Craft(int x, int y) {
ImageIcon ii = new ImageIcon(this.getClass().getResource(craft));
image = ii.getImage();
width = image.getWidth(null);
height = image.getHeight(null);
visible = true;
this.x = x;
this.y = y;
}
public void move() {
x += dx;
y += dy;
if (x < 1) {
x = 1;
}
if (y < 1) {
y = 1;
}
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public Image getImage() {
return image;
}
public void setVisible(boolean visible) {
this.visible = visible;
}
public boolean isVisible() {
return visible;
}
public Rectangle getBounds() {
return new Rectangle(x, y, width, height);
}
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT) {
dx = -1;
}
if (key == KeyEvent.VK_RIGHT) {
dx = 1;
}
}
public void keyReleased(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT) {
dx = 0;
}
if (key == KeyEvent.VK_RIGHT) {
dx = 0;
}
}
}
