07-23-2011, 05:44 PM
program does not enter for loop in Java 2011
Code:
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
public class SnakeG extends JPanel implements KeyListener, Runnable{
private Vector<Point> snake = new Vector<Point> (5,2);
private Vector<Rectangle> snakeRectangle = new Vector<Rectangle> (5,2);
public void startGraphics (){
this.addKeyListener(this);
Thread thread = new Thread (this);
repaint();
grabFocus();
snake.add (new Point (250,250));
snake.add(new Point (250,240));
snake.add(new Point (250,230));
addBall();
thread.start();
}
private void addBall() {
// TODO Auto-generated method stub
}
public void paintComponent (Graphics g){
//TODO GRAPHICS AREA
super.paintComponent (g);
for (Point x : snake){
g.fillOval((int)x.getX(),(int)x.getY(),10, 10);
}
}
private boolean pressed = false;
private boolean up,down,left,right;
@Override
public void keyPressed(KeyEvent e) {
System.out.println ("KeyListener");
int key = e.getKeyCode();
up = false;
down = false;
left = false;
right = false;
if (key == KeyEvent.VK_UP && pressed == false){
up = true;
}
else if (key == KeyEvent.VK_DOWN && pressed == false){
down = true;
}
else if (key == KeyEvent.VK_LEFT && pressed == false){
left = true;
}
else if (key == KeyEvent.VK_RIGHT && pressed == false){
right = true;
}
pressed = true;
}
@Override
public void keyReleased(KeyEvent e) {
pressed = false;
}
@Override
public void keyTyped(KeyEvent e){}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println ("Started Thread");
while (true){
if (up == true){
for (int i = snake.size(); i < 0; i--){
System.out.println ("Entered loop");
if (i == 0){
snake.firstElement().y -= 10;
}
else {
snake.elementAt(i).y = snake.elementAt(i-1).y;
}
snake.elementAt(i);
}
}
else if (down == true){
}
else if (left == true){
for (int i = snake.size(); i < 0; i--){
if (i == 0){
snake.firstElement().x -= 10;
}
else {
snake.elementAt(i).x = snake.elementAt(i-1).x;
}
}
}
else if (right == true){
}
repaint();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}0300-9520262
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