i thought i did everythig right but when i compile/run the program it says that
ID: 3550035 • Letter: I
Question
i thought i did everythig right but when i compile/run the program it says that selection doesnt contain main......
here is my code
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
interface Commons {
public static final int WIDTH = 300;
public static final int HEIGTH = 400;
public static final int BOTTOM = 390;
public static final int PADDLE_RIGHT = 250;
public static final int BALL_RIGHT = 280;
}
public class Sprite {
protected int x;
protected int y;
protected int width;
protected int heigth;
protected Image image;
public void setX(int x) {
this.x = x;
}
public int getX() {
return x;
}
public void setY(int y) {
this.y = y;
}
public int getY() {
return y;
}
public int getWidth() {
return width;
}
public int getHeight() {
return heigth;
}
Image getImage()
{
return image;
}
Rectangle getRect()
{
return new Rectangle(x, y,
image.getWidth(null), image.getHeight(null));
}
}
class Brick extends Sprite {
String brickie = "../images/brickie.png";
boolean destroyed;
public Brick(int x, int y) {
this.x = x;
this.y = y;
ImageIcon ii = new ImageIcon(this.getClass().getResource(brickie));
image = ii.getImage();
width = image.getWidth(null);
heigth = image.getHeight(null);
destroyed = false;
}
public boolean isDestroyed()
{
return destroyed;
}
public void setDestroyed(boolean destroyed)
{
this.destroyed = destroyed;
}
}
class Ball extends Sprite implements Commons {
private static final int BALL_RIGHT = 0;
private int xdir;
private int ydir;
protected String ball = "../images/ball.png";
public Ball() {
xdir = 1;
ydir = -1;
ImageIcon ii = new ImageIcon(this.getClass().getResource(ball));
image = ii.getImage();
width = image.getWidth(null);
heigth = image.getHeight(null);
resetState();
}
public void move()
{
x += xdir;
y += ydir;
if (x == 0) {
setXDir(1);
}
if (x == BALL_RIGHT) {
setXDir(-1);
}
if (y == 0) {
setYDir(1);
}
}
public void resetState()
{
x = 230;
y = 355;
}
public void setXDir(int x)
{
xdir = x;
}
public void setYDir(int y)
{
ydir = y;
}
public int getYDir()
{
return ydir;
}
public void move1()
{
x += xdir;
y += ydir;
if (x == 0) {
setXDir(1);
}
if (x == BALL_RIGHT) {
setXDir(-1);
}
if (y == 0) {
setYDir(1);
}
}
public void setXDir1(int x)
{
xdir = x;
}
public void setYDir1(int y)
{
ydir = y;
}
}
class Paddle extends Sprite implements Commons {
String paddle = "../images/paddle.png";
int dx;
public Paddle() {
ImageIcon ii = new ImageIcon(this.getClass().getResource(paddle));
image = ii.getImage();
width = image.getWidth(null);
heigth = image.getHeight(null);
resetState();
}
public static class Commons {
public static int PADDLE_RIGHT;
}
public void move() {
x += dx;
if (x <= 2)
x = 2;
if (x >= Commons.PADDLE_RIGHT)
x = Commons.PADDLE_RIGHT;
}
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT) {
dx = -2;
}
if (key == KeyEvent.VK_RIGHT) {
dx = 2;
}
}
public void keyReleased(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT) {
dx = 0;
}
if (key == KeyEvent.VK_RIGHT) {
dx = 0;
}
}
public void resetState() {
x = 200;
y = 360;
}
}
class Board extends JPanel implements Commons {
/**
*
*/
private static final long serialVersionUID = 1L;
Image ii;
Timer timer;
String message = "Game Over";
Ball ball;
Paddle paddle;
Brick bricks[];
boolean ingame = true;
int timerId;
public Board() {
addKeyListener(new TAdapter());
setFocusable(true);
bricks = new Brick[30];
setDoubleBuffered(true);
timer = new Timer();
timer.scheduleAtFixedRate(new ScheduleTask(), 1000, 10);
}
public void addNotify() {
super.addNotify();
gameInit();
}
public void gameInit() {
ball = new Ball();
paddle = new Paddle();
int k = 0;
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 6; j++) {
bricks[k] = new Brick(j * 40 + 30, i * 10 + 50);
k++;
}
}
}
public void paint(Graphics g) {
super.paint(g);
if (ingame) {
g.drawImage(ball.getImage(), ball.getX(), ball.getY(),
ball.getWidth(), ball.getHeight(), this);
g.drawImage(paddle.getImage(), paddle.getX(), paddle.getY(),
paddle.getWidth(), paddle.getHeight(), this);
for (int i = 0; i < 30; i++) {
if (!bricks[i].isDestroyed())
g.drawImage(bricks[i].getImage(), bricks[i].getX(),
bricks[i].getY(), bricks[i].getWidth(),
bricks[i].getHeight(), this);
}
} else {
Font font = new Font("Verdana", Font.BOLD, 18);
FontMetrics metr = this.getFontMetrics(font);
g.setColor(Color.BLACK);
g.setFont(font);
g.drawString(message,
(Commons.WIDTH - metr.stringWidth(message)) / 2,
Commons.WIDTH / 2);
}
Toolkit.getDefaultToolkit().sync();
g.dispose();
}
private class TAdapter extends KeyAdapter {
public void keyReleased(KeyEvent e) {
paddle.keyReleased(e);
}
public void keyPressed(KeyEvent e) {
paddle.keyPressed(e);
}
}
class ScheduleTask extends TimerTask {
public void run() {
ball.move();
paddle.move();
checkCollision();
repaint();
}
}
public void stopGame() {
ingame = false;
timer.cancel();
}
public class Commons {
public static final int WIDTH = 0;
public static final double BOTTOM = 0;
public static final int HEIGTH = 0;
}
public void checkCollision() {
if (ball.getRect().getMaxY() > Commons.BOTTOM) {
stopGame();
}
for (int i = 0, j = 0; i < 30; i++) {
if (bricks[i].isDestroyed()) {
j++;
}
if (j == 30) {
message = "Victory";
stopGame();
}
}
if ((ball.getRect()).intersects(paddle.getRect())) {
int paddleLPos = (int)paddle.getRect().getMinX();
int ballLPos = (int)ball.getRect().getMinX();
int first = paddleLPos + 8;
int second = paddleLPos + 16;
int third = paddleLPos + 24;
int fourth = paddleLPos + 32;
if (ballLPos < first) {
ball.setXDir(-1);
ball.setYDir(-1);
}
if (ballLPos >= first && ballLPos < second) {
ball.setXDir(-1);
ball.setYDir(-1 * ball.getYDir());
}
if (ballLPos >= second && ballLPos < third) {
ball.setXDir(0);
ball.setYDir(-1);
}
if (ballLPos >= third && ballLPos < fourth) {
ball.setXDir(1);
ball.setYDir(-1 * ball.getYDir());
}
if (ballLPos > fourth) {
ball.setXDir(1);
ball.setYDir(-1);
}
}
for (int i = 0; i < 30; i++) {
if ((ball.getRect()).intersects(bricks[i].getRect())) {
int ballLeft = (int)ball.getRect().getMinX();
int ballHeight = (int)ball.getRect().getHeight();
int ballWidth = (int)ball.getRect().getWidth();
int ballTop = (int)ball.getRect().getMinY();
Point pointRight =
new Point(ballLeft + ballWidth + 1, ballTop);
Point pointLeft = new Point(ballLeft - 1, ballTop);
Point pointTop = new Point(ballLeft, ballTop - 1);
Point pointBottom =
new Point(ballLeft, ballTop + ballHeight + 1);
if (!bricks[i].isDestroyed()) {
if (bricks[i].getRect().contains(pointRight)) {
ball.setXDir(-1);
}
else if (bricks[i].getRect().contains(pointLeft)) {
ball.setXDir(1);
}
if (bricks[i].getRect().contains(pointTop)) {
ball.setYDir(1);
}
else if (bricks[i].getRect().contains(pointBottom)) {
ball.setYDir(-1);
}
bricks[i].setDestroyed(true);
}
}
}
}
@SuppressWarnings("null")
public void gameInit1() {
ball = new Ball();
paddle = new Paddle();
int k = 0;
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 6; j++) {
bricks[k] = new Brick(j * 40 + 30, i * 10 + 50);
k++;
}
}
if (ingame) {
Graphics g = null;
g.drawImage(ball.getImage(), ball.getX(), ball.getY(),
ball.getWidth(), ball.getHeight(), this);
g.drawImage(paddle.getImage(), paddle.getX(), paddle.getY(),
paddle.getWidth(), paddle.getHeight(), this);
for (int i = 0; i < 30; i++) {
Graphics g1;
if (!bricks[i].isDestroyed())
g.drawImage(bricks[i].getImage(), bricks[i].getX(),
bricks[i].getY(), bricks[i].getWidth(),
bricks[i].getHeight(), this);
}
}
for (int i = 0, j = 0; i < 30; i++) {
if (bricks[i].isDestroyed()) {
j++;
}
if (j == 30) {
message = "Victory";
stopGame();
}
}
int first = 0;
int ballLPos = 0;
if (ballLPos < first) {
ball.setXDir(-1);
ball.setYDir(-1);
}
Point pointTop = null;
int i = 0;
if (bricks[i].getRect().contains(pointTop)) {
ball.setYDir(1);
}
}
}
Explanation / Answer
Main function is the function that compiler calls when its compiles a java class/project of that class..
In the main function you call other function (in that same class or other classinherited) and execute your work
So Make a main function in a new class and call other function of the other classes ( implements brick,scheule task ) and call them
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