Question

getting error for my game in Java
code
package maze;

import javax.swing.JFrame;

public class Maze
{

public static void main(String[] args)
{
new Maze();
}
public Maze(){
JFrame f = new JFrame();
f.setTitle("Maze Game");
f.setSize(500, 400);
f.setLocationRelativeTo(null);
f.add(new Board());
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}

Answer 1

this is what i got:
error loading map
Exception in thread "main" java.lang.NullPointerException
at maze.Map.readFile(Map.java:55)
at maze.Map.<init>(Map.java:23)
at maze.Board.<init>(Board.java:14)
at maze.Maze.<init>(Maze.java:17)
at maze.Maze.main(Maze.java:10)

Answer 2

can you post your code here or another site to view it? I hate downloading all this code to my comp...

Answer 3

maze.java=
package maze;

import javax.swing.JFrame;

public class Maze
{

public static void main(String[] args)
{
new Maze();
}
public Maze(){
JFrame f = new JFrame();
f.setTitle("Maze Game");
f.setSize(500, 400);
f.setLocationRelativeTo(null);
f.add(new Board());
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}

Answer 4

player.java =
package maze;

import java.awt.Image;

import javax.swing.ImageIcon;

public class Player {

private int tileX, tileY;

private Image player;
public Player(){
ImageIcon img= new ImageIcon("//users//Singh//Documents//test//tutorail//smiley.png");
player=img.getImage();

tileX=1;
tileY=1;

}
public Image getPlayer(){
return player;
}


public int getTileX(){
return tileX;
}

public int getTileY(){
return tileY;
}

public void move( int dx, int dy){

tileX+=dx;
tileY+=dy;
}
}

Answer 5

map.java=
package maze;

import java.awt.*;
import java.io.*;
import java.util.*;

import javax.swing.ImageIcon;

public class Map
{
private Scanner j;

private String Map[]=new String[16];
private Image grass,
finish,
wall;
public Map()
{
ImageIcon img= new ImageIcon("//users//Singh//Documents//test//tutorail//grass.png");
grass = img.getImage();
img= new ImageIcon("//users//Singh//Documents//test//tutorail//wall.png");
wall=img.getImage();
img= new ImageIcon ("//users//Singh//Documents//test//tutorail//grass.png");
finish=img.getImage();
openFile1();
readFile();
closeFile();
}

public Image getGrass()
{
return grass;
}

public Image getWall()
{
return wall;
}

public Image getFinish(){
return finish;
}

public String getMap(int x, int y){
String index=Map[y].substring(x, x+1);
return index;
}


public void openFile1(){
try
{
j=new Scanner(new File("//users//Singh//Documents//test//tutorail//Map.txt"));
}catch(Exception e)
{
System.out.println("error loading map");
}
}

public void readFile()
{
while(j.hasNext())
{
for(int i=0;i<14;i++)
{
Map[i]=j.next();
}
}
}

public void closeFile()
{
j.close();
}
}

Answer 6

Board.java=
package maze;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Board extends JPanel implements ActionListener
{
private Timer timer;

private Map j;
private Player p;
private String Message=" ";
public Board(){
j= new Map();
p=new Player();
addKeyListener(new Al());
setFocusable(true);
timer=new Timer(25, this);
timer.start();
}

public void actionPerformed(ActionEvent e)
{
if(j.getMap(p.getTileX(), p.getTileY()).equals("f")){
Message="Winner";
}
repaint();
}

public void paint(Graphics g)
{
super.paint(g);

for(int y=0;y<16;y++){
for(int x=0;x<16;x++){
if(j.getMap(x, y).equals("f")){
g.drawImage(j.getFinish(),x*32,y*32,null);
}
if(j.getMap(x, y).equals("g")){
g.drawImage(j.getGrass(),x*32,y*32,null);
}
if(j.getMap(x, y).equals("w")){
g.drawImage(j.getWall(),x*32,y*32,null);
}
}
}
g.drawString(Message, 50, 50);
g.drawImage(p.getPlayer(), p.getTileX()*32, p.getTileY()*32,null);
}

public class Al extends KeyAdapter{

public void ketPressed(KeyEvent e){
int keycode=e.getKeyCode();

if (keycode == KeyEvent.VK_W) {
if (!j.getMap(p.getTileX(), p.getTileY() - 1).equals("w")) {
p.move(0, -1);
}
}
if (keycode == KeyEvent.VK_S) {
if (!j.getMap(p.getTileX(), p.getTileY() + 1).equals("w")) {
p.move(0, 1);
}
}
if (keycode == KeyEvent.VK_A) {
if (!j.getMap(p.getTileX() - 1, p.getTileY()).equals("w")) {
p.move(-1, 0);
}
}
if (keycode == KeyEvent.VK_D) {
if (!j.getMap(p.getTileX() - 1, p.getTileY()).equals("w")) {
p.move(1, 0);
}
}
}

public void KeyRelased(KeyEvent e){

}

public void keyTyped(KeyEvent e){

}

}



}

Answer 7

it says error loading map i think since im using a .txt file for the map it wont work so what could i use

Answer 8

figured out how to add .txt file on Macs

Answer 9

in your code you should have put main method at last.
function Maze() it has to be super .
JFrame has to be declared private and out of function maze()
but inside the class " public class Maze " .

Answer 10

j=new Scanner(new File("//users//Singh//Documents//test//tutorail//Map.txt"));

I think you need C: Also tutorial isn't spelled correctly if that might cause an issue. I don't know why you're reading in a text file....?