Develop Reference

Java game a bullet killed all object on the screen

I am trying to make a plane shooting game.
I have a plane with a number of laser(maxLaser) and a number of random enemies.
When I create a single random enemy it is fine but when I make a number of enemy I have a tiny problem.
When I shot any of enemy with the bullet(laser) kills every enemies on the screen.
I guess I have a problem with two nested loops (maxLaser and maxEnemy) but I could not figure out.
This is the code I am trying to fix that calculate distance laser and enemy
public void updatehelicopter(double dt) {
helicopterSpin = getFrame(0.2, 4);
// nested loop for kill enemies
for(int l =0; l<maxHelicopter; l++){
helicopterPositionX[l] += helicopterVelocityX[l] * dt;
helicopterPositionY[l] += helicopterVelocityY[l] * dt;
// if(helicopterActive[l]==true){
for (int i = 0; i < maxLaser; i++) {
if (laserActive[i] == true) {
if (distance(laserPositionX[i], laserPositionY[i], helicopterPositionX[l], helicopterPositionY[l]) < 20* 1.2) {
// Destroy the laser
laserActive[i] = false;
helicopterActive[l]=false;
// Create an explosion
createExplosion(helicopterPositionX[i], helicopterPositionY[l]);
// Create a new random helicopter
randomhelicopter();
}
}
}
}
}
The idea is, I want to create 10 enemies and when shot one of them the program that I want to create one more simultaneously.
Here is my Laser and Enemies classes that you can imagine.
Enemy:
Image helicopters;
Image[] helicopterF = new Image[4];
Image[] helicopterR = new Image[4];
Image[] helicopterL = new Image[4];
Image helicopterImage;
// helicopter Position
double[] helicopterPositionX;
double[] helicopterPositionY;
double[] helicopterVelocityX;
double[] helicopterVelocityY;
double[] helicopterAngle;
int helicopterSpin;
boolean helicopterLeft;
boolean helicopterRight;
boolean[] helicopterActive;
int maxHelicopter;
int numhelicopter ;
public void inithelicopter() {
maxHelicopter = 10;
numhelicopter = maxHelicopter;
helicopterPositionX = new double[maxHelicopter];
helicopterPositionY = new double[maxHelicopter];
helicopterVelocityX= new double[maxHelicopter];
helicopterVelocityY= new double[maxHelicopter];
helicopterAngle = new double[maxHelicopter];
helicopterActive = new boolean[maxHelicopter];
for(int i =0; i<maxHelicopter;i++){
helicopterActive[i]=false;
}
// Load image
// helicopterPositionX= 300;
for (int i = 0; i < 4; i++) {
helicopterF[i] = subImage(helicopters, 0 + i * 300, 0, 300, 300);
}
for (int i = 0; i < 4; i++) {
helicopterR[i] = subImage(helicopters, 0 + i * 300 + 1200, 0, 300, 300);
}
for (int i = 0; i < 4; i++) {
helicopterL[i] = subImage(helicopters, 0 + i * 300 + 2400, 0, 300, 300);
}
// helicopterPositionY= 400;
// helicopterImage = subImage(spritesheet, 480, 0, 240, 240);
}
// Randomly position helicopter
public void randomhelicopter() {
for (int i = 0; i < numhelicopter; i++) {
// Random position
// random number between lower and upper limit for direction of items
helicopterPositionX[i] = (int) (Math.random() * (600 - 500)) + 500;
helicopterPositionY[i] = rand(-500);
// Random Velocity
helicopterVelocityX[i] = -20;
helicopterVelocityY[i] = 80;
// Random Angle
helicopterAngle[i] = 40;
}
}
// Function to update 'move' the helicopter
public void updatehelicopter(double dt) {
helicopterSpin = getFrame(0.2, 4);
//
for(int l =0; l<maxHelicopter; l++){
helicopterPositionX[l] += helicopterVelocityX[l] * dt;
helicopterPositionY[l] += helicopterVelocityY[l] * dt;
// if(helicopterActive[l]==true){
for (int i = 0; i < maxLaser; i++) {
if (laserActive[i] == true) {
if (distance(laserPositionX[i], laserPositionY[i], helicopterPositionX[l], helicopterPositionY[l]) < 20* 1.2) {
// Destroy the laser
laserActive[i] = false;
helicopterActive[l]=false;
// Create an explosion
createExplosion(helicopterPositionX[i], helicopterPositionY[l]);
// Create a new random helicopter
randomhelicopter();
}
}
}
}
}
public void drawhelicopter() {
// Save the current transform
for(int i=0; i<maxHelicopter; i++){
saveCurrentTransform();
// ranslate to the position of the helicopter
translate(helicopterPositionX[i], helicopterPositionY[i]);
// Rotate the drawing context around the angle of the helicopter
rotate(helicopterAngle[i]);
// Draw the actual helicopter
//int i = getAnimationFrame(explosionTimer, explosionDuration, 30);
drawImage(helicopterF[helicopterSpin], -30, -30, 110, 110);
// Restore last transform to undo the rotate and translate transforms
restoreLastTransform();
}
}
Laser:
Image laserImage;
double[] laserPositionX;
double[] laserPositionY;
// Laser velocity
double[] laserVelocityX;
double[] laserVelocityY;
// Laser Angle
double[] laserAngle;
// Laser active
boolean[] laserActive;
// Laser Mode
int laserMode;
double rapidFireDelay;
double rapidFireTimer;
int maxLaser, numLaser;
// NOTE: try first add 5 different level and if works then you should try make
// one laser and should cahnge only image
public void laserInit() {
maxLaser = 9;
numLaser = maxLaser;
laserMode = 0;
rapidFireDelay = 0.1;
laserPositionX = new double[maxLaser];
laserPositionY = new double[maxLaser];
laserVelocityX = new double[maxLaser];
laserVelocityY = new double[maxLaser];
laserAngle = new double[maxLaser];
laserActive = new boolean[maxLaser];
for (int i = 0; i < maxLaser; i++) {
laserActive[i] = false;
}
laserImage = subImage(laser, 1536, 0, 512, 512);
}
public void fireLaser(double x, double y, double angle) {
for (int i = 0; i < numLaser; i++) {
if (laserActive[i] == false) {
laserPositionX[i] = x;
laserPositionY[i] = y;
laserVelocityX[i] = sin(angle) * 350;
laserVelocityY[i] = -cos(angle) * 350;
laserAngle[i] = angle;
// laseractive[i] == true;
laserActive[i] = true;
break;
}
}
}
public void fireLaser() {
// NOTE: check variable of laserpower
if (laserMode == 0) {
// Normal Mode
fireLaser(airplanePositionX, airplanePositionY, airplaneAngle);
} else if (laserMode == 1) {
// Scatter Shot
int inactiveLasers = 0;
// For all lasers
for (int i = 0; i < numLaser; i++) {
// Check if laser is inactive
if (laserActive[i] == false) {
// Count number of inactive lasers
inactiveLasers++;
}
}
// Check if at least 3 lasers are free
if (inactiveLasers >= 3) {
// Fire three lasers
fireLaser(airplanePositionX, airplanePositionY, airplaneAngle - 15);
fireLaser(airplanePositionX, airplanePositionY, airplaneAngle);
fireLaser(airplanePositionX, airplanePositionY, airplaneAngle + 15);
}
} else if (laserMode == 2) {
// Rapid-Fire Mode
fireLaser(airplanePositionX, airplanePositionY, airplaneAngle + rand(20.0) - 10);
}
}
public void createLaser() {
saveCurrentTransform();
for (int i = 0; i < maxLaser; i++) {
if (laserActive[i]) {
saveCurrentTransform();
translate(laserPositionX[i], laserPositionY[i]);
rotate(laserAngle[i]);
drawImage(laserImage, -30, -30, 60, 60);
restoreLastTransform();
}
}
restoreLastTransform();
}
public void laserUpdate(double dt) {
if (laserMode == 2 && space) {
// Increment Timer
rapidFireTimer += dt;
// If Timer is greater than delay
if (rapidFireTimer > rapidFireDelay) {
// Decrement delay
rapidFireTimer -= rapidFireDelay;
// Fire laser
fireLaser();
}
}
for (int i = 0; i < maxLaser; i++) {
laserPositionX[i] += laserVelocityX[i] * dt;
laserPositionY[i] += laserVelocityY[i] * dt;
if (laserPositionX[i] < 0) {
laserActive[i] = false;
}
if (laserPositionX[i] >= width()) {
laserActive[i] = false;
}
if (laserPositionY[i] < 0) {
laserActive[i] = false;
}
}
}
I am not sure how correct I am so can I get your advise?
Externally some class in code:
public double distance(double x1, double y1, double x2, double y2) {
// Calculate and return the distance
return Math.sqrt(Math.pow(x2-x1, 2) + Math.pow(y2-y1, 2));
}

make bar chart with java graphic

i tried to generate bar chart from input
i would like have my code to get out put like this
enter image description here
this is my code but i have some error
i have some error in label that say should make method label and in main
can you guys help me fix this things
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Label;
public class baronly
{
//Establish the placement of the fields for user entry
// get some error in this
Label LabelA = addLabel("A", 1,1,1,1);
IntegerField FieldA = addIntegerField(0,1,2,1,1);
Label LabelB = addLabel("B", 1,3,1,1);
IntegerField FieldB = addIntegerField(0,1,4,1,1);
Label LabelC = addLabel("C", 1,5,1,1);
IntegerField FieldC = addIntegerField(0,1,6,1,1);
Label LabelD = addLabel("D", 1,7,1,1);
IntegerField FieldD = addIntegerField(0,1,8,1,1);
Label LabelF = addLabel("F", 1,9,1,1);
IntegerField FieldF = addIntegerField(0,1,10,1,1);
//Establish a drop down menu for the drawing
//Right now we only have one choice -- Bar
//Establish variables for this program
int numberOfScores = 5;
int Xleft = 100;
int Xright = 300;
int Ytop = 100;
int Ybottom = 250; // y value entries can be up to 150
int BarWidth = 10;
int totalX , totalY;
int[ ] scores;
char graphChoice;
//Constructor to establish the initial values in the program
public baronly()
{
scores = new int[numberOfScores];
for (int i = 0; i < scores.length; i++)
scores[ i ] = 0;
totalX = Xright - Xleft + 1;
totalY = Ybottom - Ytop + 1;
}
//Allow for the menu choices
//Remember, we only have one choice right now
public void paint (Graphics g)
{
getInputData();
g.setColor (Color.red); //set color of the graph
g.drawString("Java Grades",170,290); //title
drawBarGraph(g);
}
//Get input from the screen
public void getInputData()
{
scores[0] = FieldA.getNumber();
scores[1] = FieldB.getNumber();
scores[2] = FieldC.getNumber();
scores[3] = FieldD.getNumber();
scores[4] = FieldF.getNumber();
}
//Draw the bar graph
public void drawBarGraph(Graphics g)
{
drawAxes(g);
int i, x, y, height, largestNumber, xIncrement, yIncrement;
//Compute the x and y increments
largestNumber = findLargest (scores);
xIncrement = totalX /numberOfScores;
if (largestNumber ==0)
yIncrement = 0;
else
yIncrement = totalY / largestNumber;
//Draw the bars
for(i=0; i < numberOfScores; i++)
{
x = getXCoordinate(i+1, xIncrement);
y = getYCoordinate(scores[i], yIncrement);
x = x - BarWidth / 2;
height = Ybottom - y + 1;
g.fillRect(x, y, BarWidth, height);
}
//Label x - axes with grade choices
String [ ] label = {"A", "B", "C", "D", "F"};
for(i=1; i<= numberOfScores; i++)
g.drawString(label[i-1], 100+ i*xIncrement, 270);
//Label y - axes with quantity of each grade
int topy;
if(largestNumber%10==0)
topy=largestNumber;
else
topy=(largestNumber/10+1)*10;
//i=i+5 controls y value label -- adjust for size of data
for (i=0; i<=topy; i=i+5)
{
g.drawString(String.valueOf(i), 70, Ybottom-i*yIncrement+5);
}
}
//Draw the axes for the graph
public void drawAxes (Graphics g)
{
g.drawLine(Xleft, Ytop, Xleft, Ybottom);
g.drawLine(Xleft, Ybottom, Xright, Ybottom);
}
//Determining x coordinate
public int getXCoordinate(int i, int xIncrement)
{
return Xleft + xIncrement *i;
}
//Determining y coordinate
public int getYCoordinate(int numStudents, int yIncrement)
{
return Ybottom - yIncrement * numStudents;
}
//Finding the largest value in the array
public int findLargest(int [ ] a)
{
int i;
int loc = 0;
for(i=1; i<a.length; i++)
if(a[i]>a[loc])
loc = i;
return a[loc];
}
//Main
public static void main(String[ ] args)
{
baronly frm = new baronly();
frm.setSize(400,300);
frm.setVisible(true);
}
}
that error gave says i should give method in label what that suppose to mean

My sorting algorithms are only going through once

I am writing a program that sorts 2 arrays of the same values by using two different algorithms. It loops through the arrays once each time a button is clicked. My problem is that it only sorts the first time you click the button. Every other time nothing happens. I put a count incrementer to see if the code was running and it was. I'm stumped. Any help will be appreciated.
I fixed the selection sort.
public class TwoSortsPanel extends JPanel
{
private int width = 10, gap = 3, x = 200, y = 50;
private int[] ranArr1 = new int[15], ranArr2 = new int[15];
private Color blue = Color.blue, red = Color.red, pink = Color.pink, gray = Color.gray;
public static int count = 0, indexSel = 0;
{
for(int i = 0; i < ranArr1.length-1; i++)
{
ranArr1[i] = (int) (Math.random() * 15);
ranArr2[i] = ranArr1[i];
}
}
public TwoSortsPanel()
{
printArray(ranArr1);
setBackground(pink);
setPreferredSize (new Dimension (400,300));
JButton sort = new JButton ("Sort");
sort.addActionListener(new ButtonListener());
add (sort);
}
public static void printArray(int[] c)
{
System.out.println(Arrays.toString(c));
}
public void paintComponent (Graphics page)
{
super.paintComponent(page);
page.drawString("" + count, 10, 12);
if (insertion() == false || selection() == false)
{
int yPlus = 50;
for(int i = 0; i < ranArr1.length; i++)
{
page.setColor(blue);
page.fillRect(x, yPlus, ranArr1[i]*10, width);
yPlus += width + gap;
}
yPlus = 50;
for(int i = 0; i < ranArr2.length; i++)
{
page.setColor(red);
page.fillRect(x, yPlus, -ranArr2[i]*10, width);
yPlus += width + gap;
}
}
else
{
int yPlus = 50;
for(int i = 0; i < ranArr1.length; i++)
{
page.setColor(gray);
page.fillRect(x, yPlus, ranArr1[i]*10, width);
yPlus += width + gap;
}
yPlus = 50;
for(int i = 0; i < ranArr2.length; i++)
{
page.setColor(gray);
page.fillRect(x, yPlus, -ranArr2[i]*10, width);
yPlus += width + gap;
}
}
}
private class ButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
displaySelection(ranArr1);
displayInsertion(ranArr2);
count++;
printArray(ranArr1);
repaint();
}
}
public static void displaySelection(int[] a)
{
int temp;
int min = indexSel;
for (int scan = indexSel+1; scan < a.length ; scan++)
if (a[scan] < a[min])
min = scan;
temp = a[min];
a[min] = a[indexSel];
a[indexSel] = temp;
count++;
indexSel++;
}
public static void displayInsertion(int[] b)
{
int index = 1;
int key = b[index];
int position = index;
while (position > 0 && b[position-1] > key )
{
b[position] = b[position-1];
position--;
}
b[position] = key;
}
public boolean selection()
{
for (int i = 0; i < ranArr1.length-1; i++)
{
if(ranArr1[i] > ranArr1[i+1])
{
return false;
}
}
return true;
}
public boolean insertion()
{
for (int i = 0; i < ranArr2.length-1; i++)
{
if(ranArr2[i] > ranArr2[i+1])
{
return false;
}
}
return true;
}
}
Sorry. I didn't want the post to look too busy and I guess it lost meaning.

Java Tetris - Confused on grid[row][col] and coordinates (x, y)

I'm making Tetris in java for fun... I pretty much had everything working... but later found out that when I wanted to change the dimensions so it was square ([10 row][10 col] matrix, but instead a [12 row][10 col] matrix), that I started getting Index Out of Bound exceptions... see here: Java Tetris - weird row clearing issue
So I tried fixing everything so that the rows and columns weren't flip flopped... But am now getting hung up on the fact that the grid takes [row][col], but I’m moving around the tiles as (x, y) coordinates…
What’s confusing me is that row = y and col = x… which is reversed… so when I pass in coordinates I’m not sure when to swap them.
I know it’s a simple thing, but it’s confusing the hell out of me and I keep getting out of bounds exceptions whenever I think I have it right.
I'm not sure where the exact issue is, so I'm posting a full Sscce of my program... I think the issue is in the Board class...
Here, the block should still be able to move down... but if it tries to go down further than this...
I get:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 10
at Board.getTileAt(Board.java:177)
at Tile.collision(Tile.java:31)
at Piece.isCollision(Piece.java:172)
at Board.collisionCheck(Board.java:192)
at Piece.movePieceCheck(Piece.java:87)
at Board.keyPressed(Board.java:160)
Sscce:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainSscce extends JPanel {
static MainSscce runMe;
BoardSscce gameBoard, scoreBoard;
public MainSscce() { //creates a new frame window and sets properties
JFrame f = new JFrame("Tetris");
//width (height), length, tilesize
gameBoard = new BoardSscce(12, 10, 35);
// scoreBoard = new BoardSscce(10, 10, 35);
f.add(gameBoard);
f.setSize(gameBoard.getWidth(), gameBoard.getHeight());
f.setVisible(true);
f.setResizable(false);
f.setVisible(true);
f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
Dimension screensize = Toolkit.getDefaultToolkit().getScreenSize();
//set j frame location to appear in middle of screen
f.setLocation( (screensize.width - f.getWidth())/2,
(screensize.height - f.getHeight())/2-100 );
}
public static void main(String[] args) {
runMe = new MainSscce();
}
}
import java.awt.Graphics;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.event.*; // for ActionListener and ActionEvent
import java.util.Random;
public class BoardSscce extends JPanel implements KeyListener {
private TileSscce grid[][];
private int totalRows, totalCols, tilesize, level, totalScore;
private final int changeLevelMultiplier;
private PieceSscce newPiece, nextPiece;
private String randomPiece;
private boolean gameLost;
public BoardSscce(int r, int c, int ts) {
totalRows = r;
totalCols = c;
tilesize = ts;
//set grid size to [# rows][# columns], aka [height][width]
grid = new TileSscce[totalRows][totalCols];
gameLost = false;
System.out.println("TotalRows: " + totalRows + ", " + "TotalCols: " + totalCols);
//multiplier to determine what score the level changes, which is:
//level * changeLevelMultiplier;
changeLevelMultiplier = 40;
//initialize score to 0
totalScore = 0;
//initialize level to 0
level = 0;
newPiece = new PieceSscce(this, randomPiece(), getColor());
addKeyListener(this);
setFocusable(true);
//getTranspose();
timer();
}
public String randomPiece() {
String[] Pieces = {"L", "O", "Z", "RevZ", "Bar", "T", "RevL"};
int rand = (int) (Math.random() * Pieces.length);
randomPiece = Pieces[rand];
return randomPiece;
}
public Color getColor() {
Color color;
if (randomPiece.equals("L"))
color = new Color(17, 255, 0);
else if(randomPiece.equals("O"))
color = new Color(117, 168, 255);
else if(randomPiece.equals("Z"))
color = new Color(255, 187, 82);
else if(randomPiece.equals("RevZ"))
color = new Color(206, 27, 72);
else if(randomPiece.equals("Bar"))
color = new Color(50, 216, 219);
else if(randomPiece.equals("T"))
color = new Color(252, 148, 240);
else
color = new Color(255, 255, 52);
//Random rand = new Random();
//float r = rand.nextFloat();
//float g = rand.nextFloat();
//float b = rand.nextFloat();
//Color randomColor = new Color(r, g, b);
return color;
}
//dimensions of board = width * tilesize
public int getWidth() {
return totalCols * tilesize;
}
public int getHeight() {
return totalRows * tilesize;
}
public int getTileSize() {
return tilesize;
}
public void paintComponent(Graphics g) {
g.setColor(Color.black);
g.fillRect(0, 0, getWidth(), getHeight());
for(int row = 0; row < grid.length; row++) {
for(int col = 0; col < grid[row].length; col++) {
//System.out.println(row + ", " + col);
g.drawString("[" + row + "][" + col + "]", col * tilesize, row * tilesize+10);
System.out.println(row + ", " + col);
//if there is a non-null space, that is a Tetris piece... fill it
if(grid[row][col] != null) {
g.setColor(grid[row][col].getColor());
g.fillRect(row * tilesize, col * tilesize, tilesize, tilesize);
g.setColor(Color.WHITE);
}
}
}
// g.drawString("Level: " + level, this.getWidth()/2, this.getHeight()/2-130);
// g.drawString("Score: " + totalScore, this.getWidth()/2, this.getHeight()/2-100);
if (gameLost == true) {
g.drawString("Way to go, loser...", this.getWidth()/2, this.getHeight()/2);
messageTimer();
}
}
//Auto move piece
public void timer () {
int interval;
switch (level) {
//each level increases drop speed by .10 seconds
case 1: interval = 800;
break;
case 2: interval = 700;
break;
case 3: interval = 600;
break;
case 4: interval = 500;
break;
default: interval = 1000;
break;
}
Timer t = new Timer(interval, new ActionListener() {
public void actionPerformed(ActionEvent e) {
//newPiece.autoMove();
//repaint();
}
});
t.start();
}
public void messageTimer() {
Timer t = new Timer(5000, new ActionListener() {
public void actionPerformed(ActionEvent e) {
gameLost = false;
}
});
t.start();
}
//move piece on key input
public void keyPressed(KeyEvent e) {
newPiece.movePieceCheck(e.getKeyCode());
repaint();
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
}
public boolean isValidCoordinate(int x, int y) {
return x >= 0 && y >= 0 && x < totalCols && y < totalRows;
}
// returns the tile at (x, y) or null if empty
public Tile getTileAt(int x, int y) {
if(isValidCoordinate(x, y))
return grid[x][y];
return null;
}
// sets the tile at (x, y) to tile
public void setTileAt(Tile tile, int x, int y) {
if(isValidCoordinate(x, y))
grid[x][y] = tile;
}
public boolean isOpen(int x, int y) {
return isValidCoordinate(x, y) && (getTileAt(x, y) == null);
}
public void collisionCheck() {
if (newPiece.isCollision()){
newPiece = new PieceSscce(this, randomPiece(), getColor());
}
}
public void changeLevel () {
int max = (level+1)*changeLevelMultiplier;
if (totalScore >= max) {
System.out.println(max + "reached... next level");
level++;
totalScore = 0;
timer();
}
}
public int tallyScore(int totalLines) {
int score = 0;
switch (totalLines) {
case 1: score = 40 * (level + 1);
break;
case 2: score = 100 * (level + 1);
break;
case 3: score = 300 * (level + 1);
break;
case 4: score = 1200 * (level + 1);
break;
default: break;
}
return score;
}
//loop through all rows starting at bottom (12 rows)
public void checkBottomFull() {
int lines = 0;
for(int row = 12; row > 0; row--) {
/* while (isFull(row)) {
lines++;
// clearRow(row);
}*/
}
totalScore += tallyScore(lines);
//check if level needs to be changed based on current score...
changeLevel();
//reset lines after score has been incremented
lines=0;
}
//loop through all columns in that row (10 columns)
public boolean isFull(int row) {
for (int col = 0; col <= 10; col++) {
System.out.println(row + ", " + col);
if(grid[row][col] == null) {
return false;
}
}
return true;
}
public void clearRow(int rowToClear) {
for(int row = rowToClear; row > 0; row--) {
for(int col = 0; col < grid[row].length; col++) {
grid[col][row] = grid[col][row-1];
}
}
}
public void checkEndGame(int x, int y) {
//if currPiece y location = 0 AND the space below is filled...
if (y <= 2 && !isOpen(x, y+1)) {
gameLost = true;
level = 0;
totalScore = 0;
//reset timer
timer();
for(int row = 0; row < grid.length; row++) {
for(int col = 0; col < grid[row].length; col++) {
grid[row][col] = null;
}
}
}
}
}
import java.awt.Color;
import java.awt.event.KeyEvent;
public class PieceSscce {
public int[] pieceCoordinates;
public String shape, currRotation;
public Color color;
public BoardSscce board;
public int rotationsCounter;
public TileSscce tile[];
public int[] newPositionX, newPositionY, currPositionX, currPositionY;
//don't need to pass in board because I'm already utilizing the Tiles class, which knows about the board
public Piece(Board b, String randomPiece, Color randomColor) {
shape = randomPiece;
color = randomColor;
board = b;
newPositionX = new int[4];
newPositionY = new int[4];
currPositionX = new int[4];
currPositionY = new int[4];
pieceCoordinates = new int[8];
//set pieceCoordinates global variable
getShape(shape);
tile = new TileSscce[4];
int counterX = 0, counterY = 1;
System.out.print("\"" + shape + "\" Coordinates: ");
//generate 4 new Tiles at specified coordinates that will compose the Piece
for (int i = 0; i < tile.length; i++) {
tile[i] = new TileSscce(board, pieceCoordinates[counterX], pieceCoordinates[counterY]);
System.out.print("(" + pieceCoordinates[counterX] + ", " + pieceCoordinates[counterY] + ") ");
//increment by 2 because x,y values are next to each other in array
counterX+=2;
counterY+=2;
}
System.out.println("\n");
for (int i = 0; i < tile.length; i++) {
tile[i].setColor(color);
}
}
public void calcNewPosition(int newX, int newY, int currTile) {
newPositionX[currTile] = newX;
newPositionY[currTile] = newY;
}
public void clearCurrPosition() {
for (int i = 0; i < tile.length; i++) {
currPositionX[i] = tile[i].getX();
currPositionY[i] = tile[i].getY();
board.setTileAt(null, currPositionX[i], currPositionY[i]);
}
}
public void autoMove() {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getX(), tile[i].getY()+1, i);
}
clearCurrPosition();
for (int i = 0; i < tile.length; i++) {
board.checkEndGame(tile[i].getX(), tile[i].getY());
System.out.println("Checking..." + tile[i].getX() + ", " + tile[i].getY());
}
board.checkBottomFull();
board.collisionCheck();
move();
}
public void movePieceCheck(int keycode) {
if (keycode == KeyEvent.VK_DOWN) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getX(), tile[i].getY()+1, i);
}
clearCurrPosition();
for (int i = 0; i < tile.length; i++) {
board.checkEndGame(tile[i].getX(), tile[i].getY());
System.out.println("Checking..." + tile[i].getX() + ", " + tile[i].getY());
}
board.checkBottomFull();
board.collisionCheck();
move();
}
if (keycode == KeyEvent.VK_RIGHT) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getX()+1, tile[i].getY(), i);
}
clearCurrPosition();
move();
}
if (keycode == KeyEvent.VK_LEFT) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getX()-1, tile[i].getY(), i);
}
clearCurrPosition();
move();
}
//rotate left
if (keycode == KeyEvent.VK_A) {
int[] rotatedCoords = calcRotation("left");
clearCurrPosition();
rotate(rotatedCoords, "left");
}
//rotate right
if (keycode == KeyEvent.VK_D) {
int[] rotatedCoords = calcRotation("right");
clearCurrPosition();
rotate(rotatedCoords, "right");
}
}
public boolean movePieceValid() {
boolean valid = true;
for (int i = 0; i < tile.length; i++) {
if(!tile[i].checkNewLocation(newPositionX[i], newPositionY[i]))
valid = false;
}
return valid;
}
public boolean validRotation(int[] rotatedCoordinates) {
boolean valid = true;
int counterX = 0, counterY = 1;
for (int i = 0; i < tile.length; i++) {
if(!tile[i].checkNewLocation(rotatedCoordinates[counterX], rotatedCoordinates[counterY]))
valid = false;
counterX +=2;
counterY +=2;
}
return valid;
}
public void move() {
if (movePieceValid()) {
for (int i = 0; i < tile.length; i++) {
tile[i].setLocation(newPositionX[i], newPositionY[i]);
}
} else {
for (int i = 0; i < tile.length; i++) {
tile[i].setLocation(currPositionX[i], currPositionY[i]);
}
}
}
public void rotate(int[] rotatedCoordinates, String rotation) {
int counterX = 0, counterY = 1;
if (validRotation(rotatedCoordinates)) {
for (int i = 0; i < tile.length; i++) {
tile[i].setLocation(rotatedCoordinates[counterX], rotatedCoordinates[counterY]);
counterX+=2;
counterY+=2;
}
//else, if not valid move set the original location
} else {
for (int i = 0; i < tile.length; i++) {
tile[i].setLocation(currPositionX[i], currPositionY[i]);
}
}
}
public boolean isCollision() {
boolean collision = false;
for (int i = 0; i < tile.length; i++) {
if(tile[i].collision(newPositionX[i], newPositionY[i])) {
collision = true;
}
}
return collision;
}
//calc curr coordinates, send them to getRotation... which will create new piece based on coords
public int[] calcRotation(String direction) {
for (int i = 0; i < tile.length; i++) {
currPositionX[i] = tile[i].getX();
currPositionY[i] = tile[i].getY();
System.out.println("Current position: (" + currPositionX[i] + "," + currPositionY[i]+")");
}
return getRotation(currPositionX, currPositionY, direction);
}
public int[] getRotation (int coordinatesX[], int coordinatesY[], String direction) {
int[] rotationDirection;
int[] coordinates = new int[8];
int[] origin = new int[2];
int[] newCoordinates = new int[8];
int[] resultCoordinates = new int[8];
int[] finalCoordinates = new int[8];
int vectorMatrix[][] = new int[2][4];
//set either R(90) or R(-90) rotation matrix values:
if (direction.equals("right")) {
rotationDirection = new int[] {0, -1, 1, 0};
}
else {
rotationDirection = new int[] {0, 1, -1, 0};
}
int counterX = 0, counterY = 1, x = 0;
while (counterY < coordinates.length) {
//add arrays coordinatesX and coordinatesY into a single array: coordinates
coordinates[counterX] = coordinatesX[x];
coordinates[counterY] = coordinatesY[x];
counterX+=2;
counterY+=2;
x++;
}
//set origin so it rotates around center...
if (shape.equals("RevZ")) {
origin[0] = coordinates[6];
origin[1] = coordinates[7];
}
else if (shape.equals("T")) {
origin[0] = coordinates[4];
origin[1] = coordinates[5];
}
else {
origin[0] = coordinates[2];
origin[1] = coordinates[3];
}
//subtract origin from vectors
System.out.println();
counterX = 0;
counterY = 1;
while (counterY < newCoordinates.length) {
//System.out.println(coordinates[counterX] + ", " + coordinates[counterY]);
newCoordinates[counterX] = coordinates[counterX] - origin[0];
newCoordinates[counterY] = coordinates[counterY] - origin[1];
System.out.println("Translated coordinates: (" + newCoordinates[counterX] + ", " + newCoordinates[counterY] + ")");
counterX+=2;
counterY+=2;
}
System.out.println();
System.out.println("vector matrix:");
//fill up vectorMatrix with coordinates
int k = 0;
for (int col = 0; col < 4; col++) {
for (int row = 0; row < 2; row++) {
vectorMatrix[row][col] = newCoordinates[k++];
}
}
//print vectorMatrix:
for (int i = 0; i < vectorMatrix.length; i++) {
System.out.print("[");
for (int j = 0; j < vectorMatrix[i].length; j++) {
System.out.print(vectorMatrix[i][j]);
}
System.out.println("]");
}
int rotationMatrix[][] = new int[2][2];
//fill up rotationMatrix
System.out.println();
System.out.println("multiplicative matrix:");
k = 0;
for (int row = 0; row < 2; row++) {
System.out.print("[");
for (int col = 0; col < 2; col++) {
rotationMatrix[row][col] = rotationDirection[k++];
System.out.print(rotationMatrix[row][col]);
}
System.out.println("]");
}
//perform matrix multiplication
int[][] result = multiplyMatrices(rotationMatrix, vectorMatrix);
//print resulting matrix
System.out.println();
System.out.println("result matrix:");
for (int i = 0; i < result.length; i++) {
System.out.print("[");
for (int j = 0; j < result[i].length; j++) {
System.out.print(result[i][j]);
}
System.out.println("]");
}
//load new matrix coordinates back into array
k = 0;
for (int col = 0; col < 4; col++) {
for (int row = 0; row < 2; row++) {
resultCoordinates[k] = result[row][col];
k++;
}
}
System.out.println();
System.out.println("result coordinates:");
counterX = 0;
counterY = 1;
while (counterY < resultCoordinates.length) {
finalCoordinates[counterX] = resultCoordinates[counterX] + origin[0];
finalCoordinates[counterY] = resultCoordinates[counterY] + origin[1];
System.out.print("("+finalCoordinates[counterX] + ", " + finalCoordinates[counterY]+")");
counterX+=2;
counterY+=2;
}
return finalCoordinates;
}
public int[][] multiplyMatrices(int rotationMatrix[][], int vectorMatrix[][]) {
int mA = rotationMatrix.length;
int nA = rotationMatrix[0].length;
int mB = vectorMatrix.length;
int nB = vectorMatrix[0].length;
if (nA != mB) throw new RuntimeException("Illegal matrix dimensions.");
int[][] C = new int[mA][nB];
for (int i = 0; i < mA; i++) {
for (int j = 0; j < nB; j++) {
for (int k = 0; k < nA; k++) {
C[i][j] += (rotationMatrix[i][k] * vectorMatrix[k][j]);
}
}
}
return C;
}
public int[] getShape(String shape) {
if (shape.equals("L")) {
//pieceCoordinates = new int[] {0, 1, 0, 2, 1, 2, 2, 2};
pieceCoordinates = new int[] {4, 0, 4, 1, 5, 1, 6, 1};
}
else if (shape.equals("O")) {
pieceCoordinates = new int[] {0, 1, 1, 1, 0, 2, 1, 2};
}
else if (shape.equals("Z")) {
pieceCoordinates = new int[] {0, 1, 1, 1, 1, 2, 2, 2};
}
else if (shape.equals("RevZ")) {
pieceCoordinates = new int[] {1, 1, 2, 1, 0, 2, 1, 2};
}
else if (shape.equals("Bar")) {
//pieceCoordinates = new int[] {0, 1, 1, 1, 2, 1, 3, 1};
pieceCoordinates = new int[] {0, 1, 1, 1, 2, 1, 3, 1};
}
else if (shape.equals("T")) {
pieceCoordinates = new int[] {1, 1, 0, 2, 1, 2, 2, 2};
}
else if (shape.equals("RevL")) {
pieceCoordinates = new int[] {0, 2, 1, 2, 2, 2, 2, 1};
}
return pieceCoordinates;
}
}
import java.awt.Color;
import java.util.Random;
public class TileSscce {
private BoardSscce board;
private int currX, currY;
private Color color;
public TileSscce(BoardSscce b, int x, int y) {
board = b;
//when Tile is instantiated, set its position
setLocation(x, y);
}
public int getX() {
return currX;
}
public int getY() {
return currY;
}
public boolean checkNewLocation(int newX, int newY) {
boolean newLocationOK = board.isOpen(newX, newY);
return newLocationOK;
}
public boolean collision(int newX, int newY) {
boolean collision = this.getY() == ((board.getHeight()/board.getTileSize()))-2 || board.getTileAt(newX, newY) != null;
return collision;
}
public void setLocation(int newX, int newY) {
// board.setTileAt(null, currX, currY);
currX = newX;
currY = newY;
board.setTileAt(this, currX, currY);
}
public Color getColor() {
return setColor(color);
}
public Color setColor(Color myColor) {
color = myColor;
return color;
}
}
Thanks!
EDIT----------
I've tried implementing both ValarDohaeris and Svend Hansen's suggestions... Now the block is moving right when I press down, up when I press left, and down when I press right...
It seems to have to do with these methods in Board class which get and set tile locations...
// returns the tile at (x, y) or null if empty
public Tile getTileAt(int row, int col) {
System.out.println("getTileAt: " + row + ", " + col);
if(isValidCoordinate(row, col))
return grid[row][col];
return null;
}
// sets the tile at (x, y) to tile
public void setTileAt(Tile tile, int row, int col) {
System.out.println("setTileAt: " + row + ", " + col);
if(isValidCoordinate(row, col))
grid[row][col] = tile;
}
And in Piece class... movements are defined as:
public void movePieceCheck(int keycode) {
if (keycode == KeyEvent.VK_DOWN) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getRow()+1, tile[i].getCol(), i);
}
clearCurrPosition();
for (int i = 0; i < tile.length; i++) {
board.checkEndGame(tile[i].getRow(), tile[i].getCol());
}
board.checkBottomFull();
if (isCollision()) board.createNewPiece();
move();
}
if (keycode == KeyEvent.VK_RIGHT) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getRow(), tile[i].getCol()+1, i);
}
clearCurrPosition();
move();
}
if (keycode == KeyEvent.VK_LEFT) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getRow(), tile[i].getCol()-1, i);
}
clearCurrPosition();
move();
}

You have
grid = new TileSscce[totalRows][totalCols];
So when you want to access grid[x][y], you should check
x >= 0 && y >= 0 && x < totalRows && y < totalCols
in isValidCoordinate(x, y).

Emm... Quite interesting question. So to find out where the problem(s) may be I'll try to analyze your code a little bit...
You paste stack trace as
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 10
at Board.getTileAt(Board.java:177)
...
and at the same time the getTileAt()
// returns the tile at (x, y) or null if empty
public Tile getTileAt(int row, int col) {
System.out.println("getTileAt: " + row + ", " + col);
if(isValidCoordinate(row, col))//isValidCoordinate()?
return grid[row][col];
return null;
}
public boolean isValidCoordinate(int x, int y) {
return x >= 0 && y >= 0 && x < totalCols && y < totalRows;
}
... so the isValidCoordinate method return terms as
x >= 0 && y >= 0 && x < totalCols && y < totalRows
...the method doesn't allow to avoid array out-of-bounds problems; Seems like you put wrong array element indexes.
A. As I can notice, you trying to put a classic math matrix on Java [][] arrays as
public void clearRow(int rowToClear) {
for(int row = rowToClear; row > 0; row--) {
for(int col = 0; col < grid[row].length; col++) {//<-- ?
grid[col][row] = grid[col][row-1];
}
}
}
... and here I must say that you should know that in [][] arrays x,y are backwards and it is y,x because :
y (or classic i) - sub-array index (vertical)
x (or classic j) - sub-array's element index (horizontal)
so you should use array index something this way grid[y][x] or grid[i][j]
As a useful tip, I recommend you to analyze your code for logic errors in this field...
B. According to your app screenshot as
... it seems like the x,y problem takes place here too because you trying to control y (vertical) coordinates but (in real) you control x (horizontal) coordinates only :S It is still because of the row,col instead of a classic Java (col,row or y,x) [][] array index positions.
C. And again concerning to the wrong directions...
...up when I press left, and down when I press right...
if (keycode == KeyEvent.VK_RIGHT) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getRow(), tile[i].getCol()+1, i);
}
clearCurrPosition();
move();
}
Here I'll try to analyze the event as (you press right but move down)...
OK... according to one of your tasks you need to move by x coordinate (horizontally) but look closer... you make tile[i].getCol()+1 so it is newY and, of course, it moves vertically :S In your case it really moves down because you make increment as y++ ...
public void calcNewPosition(int newX, int newY, int currTile) {
newPositionX[currTile] = newX;
newPositionY[currTile] = newY;
}
public void clearCurrPosition() {
for (int i = 0; i < tile.length; i++) {
currPositionX[i] = tile[i].getX();
currPositionY[i] = tile[i].getY();
board.setTileAt(null, currPositionX[i], currPositionY[i]);
}
}
public void move() {
if (movePieceValid()) {
for (int i = 0; i < tile.length; i++) {
tile[i].setLocation(newPositionX[i], newPositionY[i]);//<-- !
}
} else {
for (int i = 0; i < tile.length; i++) {
tile[i].setLocation(currPositionX[i], currPositionY[i]);
}
}
}
...as a conclusion, I may recommend to change code (move right) something this way...
if (keycode == KeyEvent.VK_RIGHT) {
for (int i = 0; i < tile.length; i++) {
calcNewPosition(tile[i].getRow()+1, tile[i].getCol(), i);
}
clearCurrPosition();
move();
}
I hope my tips will help you to figure out what to look closer. Anyway, if you have some additional information please do comment my answer
Report if that helped you

This is based on x corresponds to columns and y corresponds to rows.
However grid is indexed by [row][col].
TileSscce grid[][] = new TileSscce[totalRows][totalCols]; // 12 => totalRows, 10 => totalCols
public int getWidth() {
return totalCols * tilesize;
}
public int getHeight() {
return totalRows * tilesize;
}
Following changes (based on your initial code - Sscce: - without later edits) will get rid of the exception and allow drawing till bottom of the board.
public void paintComponent(Graphics g) {
for (int row = 0; row < grid.length; row++) {
for (int col = 0; col < grid[row].length; col++) {
if (grid[row][col] != null) {
g.setColor(grid[row][col].getColor());
g.fillRect(col * tilesize, row * tilesize, tilesize, tilesize); // changed, check below snippet from fillRect documentation
g.setColor(Color.WHITE);
}
}
}
}
public TileSscce getTileAt(int x, int y) {
if (isValidCoordinate(x, y))
return grid[y][x]; // changed to [y][x] as grid is indexed by [row][col]
return null;
}
public void setTileAt(TileSscce tile, int x, int y) {
if (isValidCoordinate(x, y))
grid[y][x] = tile; // changed to [y][x] as grid is indexed by [row][col]
}
From fillRect documentation.
public abstract void fillRect(int x, int y, int width, int height)
The left and right edges of the rectangle are at x and x + width - 1.
The top and bottom edges are at y and y + height - 1.
This is correct.
public boolean isValidCoordinate(int x, int y) {
return x >= 0 && y >= 0 && x < totalCols && y < totalRows;
}

OutOfBoundsException. Where to put Bounds-Checking?

Where do I put bounds checking so that program generates an entire maze?
The code should print a Grid with a maze drawn by breaking walls between Cells. However, much to my dismay, the Grid stops when it reaches index 0 or 24. I need the program to visit every cell before it stops (if it goes to a border, it moves back).
Here is the previous error that I'm getting:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at Grid.genRand(Grid.java:73)
at Grid.main(Grid.java:35)
And here is the source code:
import java.awt.*;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.util.ArrayList;
public class Grid extends Canvas {
Cell[][] maze;
int size;
int pathSize;
double width, height;
ArrayList<int[]> coordinates = new ArrayList<int[]>();
public Grid(int size, int h, int w) {
this.size = size;
maze = new Cell[size][size];
for(int i = 0; i<size; i++){
for(int a =0; a<size; a++){
maze[i][a] = new Cell();
}
}
setPreferredSize(new Dimension(h, w));
}
public static void main(String[] args) {
Frame y = new Frame();
y.setLayout(new BorderLayout());
Panel r = new Panel();
r.setLayout(new BorderLayout());
Grid f = new Grid(25, 400, 400);
r.add(f, BorderLayout.CENTER);
y.add(r, BorderLayout.CENTER);
f.genRand();
f.repaint();
y.pack();
y.setPreferredSize(new Dimension(450, 450));
y.setVisible(true);
}
public void push(int[] xy){
coordinates.add(xy);
int i = coordinates.size();
coordinates.ensureCapacity(i++);
}
public int[] pop(){
int[] x = coordinates.get((coordinates.size())-1);
coordinates.remove((coordinates.size())-1);
return x;
}
public int[] top(){
return coordinates.get((coordinates.size())-1);
}
public void genRand(){
// create a CellStack (LIFO) to hold a list of cell locations [x]
// set TotalCells = number of cells in grid
int TotalCells = size*size;
// choose a cell at random and call it CurrentCell
int m = randomInt(size);
int n = randomInt(size);
while(m<1){
m = randomInt(size);
}
while(n<1){
n = randomInt(size);
}
Cell curCel = maze[m][n];
// set VisitedCells = 1
int visCel = 1;
int o = 0;
int p = 0;
int h;
int d;
int[] q;
// while VisitedCells < TotalCells
while( visCel < TotalCells){
d = 0;
// find all neighbors of CurrentCell with all walls intact
if(m!=0&&n!=0){
if(m<size&&n<size){
if(maze[m-1][n].countWalls() == 4)
{d++;}
if(maze[m+1][n].countWalls() == 4)
{d++;}
if(maze[m][n-1].countWalls() == 4)
{d++;}
if(maze[m][n+1].countWalls() == 4)
{d++;}
}
}
// if one or more found
if(d!=0){
Point[] ls = new Point[4];
ls[0] = new Point(m-1,n);
ls[1] = new Point(m+1,n);
ls[2] = new Point(m,n-1);
ls[3] = new Point(m,n+1);
// knock down the wall between it and CurrentCell
h = randomInt(3);
switch(h){
case 0: o = (int)(ls[0].getX());
p = (int)(ls[0].getY());
curCel.destroyWall(2);
maze[o][p].destroyWall(1);
break;
case 1: o = (int)(ls[1].getX());
p = (int)(ls[1].getY());
curCel.destroyWall(1);
maze[o][p].destroyWall(2);
break;
case 2: o = (int)(ls[2].getX());
p = (int)(ls[2].getY());
curCel.destroyWall(3);
maze[o][p].destroyWall(0);
break;
case 3: o = (int)(ls[3].getX());
p = (int)(ls[3].getY());
curCel.destroyWall(0);
maze[o][p].destroyWall(3);
break;
}
// push CurrentCell location on the CellStack
push(new int[] {m,n});
// make the new cell CurrentCell
m = o;
n = p;
curCel = maze[m][n];
// add 1 to VisitedCells
visCel++;
}
// else
else{
// pop the most recent cell entry off the CellStack
q = pop();
m = q[0];
n = q[1];
curCel = maze[m][n];
// make it CurrentCell
// endIf
}
// endWhile
}
}
public int randomInt(int s) { return (int)(s* Math.random());}
public void paint(Graphics g) {
int k, j;
width = getSize().width;
height = getSize().height;
double htOfRow = height / (size);
double wdOfRow = width / (size);
//checks verticals - destroys east border of cell
for (k = 0; k < size; k++) {
for (j = 0; j < size; j++) {
if(maze[k][j].checkWall(2)){
g.drawLine((int) (k * wdOfRow), (int) (j * htOfRow), (int) (k * wdOfRow), (int) ((j+1) * htOfRow));
}}
}
//checks horizontal - destroys north border of cell
for (k = 0; k < size; k++) {
for (j = 0; j < size; j++) {
if(maze[k][j].checkWall(3)){
g.drawLine((int) (k * wdOfRow), (int) (j * htOfRow), (int) ((k+1) * wdOfRow), (int) (j * htOfRow));
}}
}
}
}
class Cell {
private final static int NORTH = 0;
private final static int EAST = 1;
private final static int WEST = 2;
private final static int SOUTH = 3;
private final static int NO = 4;
private final static int START = 1;
private final static int END = 2;
boolean[] wall = new boolean[4];
boolean[] border = new boolean[4];
boolean[] backtrack = new boolean[4];
boolean[] solution = new boolean[4];
private boolean isVisited = false;
private int Key = 0;
public Cell(){
for(int i=0;i<4;i++){wall[i] = true;}
}
public int countWalls(){
int i, k =0;
for(i=0; i<4; i++) {
if (wall[i] == true)
{k++;}
}
return k;}
public boolean checkWall(int x){
switch(x){
case 0: return wall[0];
case 1: return wall[1];
case 2: return wall[2];
case 3: return wall[3];
}
return true;
}
public void destroyWall(int x){
switch(x){
case 0: wall[0] = false; break;
case 1: wall[1] = false; break;
case 2: wall[2] = false; break;
case 3: wall[3] = false; break;
}
}
public void setStart(int i){Key = i;}
public int getKey(){return Key;}
public boolean checkVisit(){return isVisited;}
public void visitCell(){isVisited = true;}
}

I overlooked you code very quickly:
you may got your exceptions while calling top() or pop() when coordinates is empty
--> coordinates.get(coordinates.size()-1) if size is 0 you try to adress index -1 -> BAM!
some methods do look very complex. you may split that functionallity in separate methods/functions
you do not mix AWT and SWING components because the do behave different
NEVER EVER do GUI stuff (showing, hiding, changing content, clicking, whatever in JFrame, JPanel etc.) out of the Event Dispatcher Thread (EDT) -> this may cause dead locks