Thread: Snake Game

Hi I am attempting to develop a Snake game, I am a complete beginner to 2D graphics, and I was wondering how to get my snake ( a rectangle) to move. I have tried Key event but it does not work. What did I do wrong and where can I improve. Thank you for your time.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
 
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.Timer;
import javax.swing.WindowConstants;
 
public class Snake extends JComponent implements ActionListener, KeyListener {
 
 
	public static void main(String[] args) {
 
		JFrame window = new JFrame ("Snake Game By Sakon");
		Snake game = new Snake();
		window.add(game);
		window.pack();
		window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		window.setVisible(true);
 
	    Timer t= new Timer (100, game);
		t.start();
 
	}
 
 
	private int snakeX=400;
	private int snakeY=400;
 
 
 
	public Dimension getPreferredSize() {
		return new Dimension (800,600);
	}
 
 
	public void paint(Graphics g) {
		//Set Back Round black
		g.setColor(Color.BLACK);
		g.fillRect(0, 0, 800, 600);
 
		//Draw dot.
		g.setColor(Color.WHITE);
		g.fillOval(0, 0, 10, 10);
 
		//Draw Snake
		g.setColor(Color.LIGHT_GRAY);
		g.fillRect(snakeX, snakeY, 5, 100);
 
	}
 
 
	@Override
	public void keyPressed(KeyEvent e) {
 
	switch(e.getKeyCode()){
 
		case KeyEvent.VK_UP:{
 
			if(snakeY>600)
			snakeY=1;
 
			snakeY=snakeY+1;
 
			repaint();
		}
 
		case KeyEvent.VK_DOWN:{
 
			if(snakeY<0)
			snakeY=600;
 
			snakeY=snakeY-1;
 
			repaint();
 
		}
 
		case KeyEvent.VK_LEFT:{
 
			if(snakeX<0)
			snakeY=800;
 
			snakeY=snakeY-1;
 
			repaint();
 
		}
		case KeyEvent.VK_RIGHT:{
 
			if(snakeX>800)
			snakeY=1;
 
			snakeY=snakeY+1;
 
			repaint();
 
		}
 
 
 
		}
 
	}
 
 
	@Override
	public void keyReleased(KeyEvent e) {
		// TODO Auto-generated method stub
 
	}
 
 
	@Override
	public void keyTyped(KeyEvent e) {
		// TODO Auto-generated method stub
 
	}
 
 
	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
 
	}

Hello.
Your code is incomplete.
You will need to learn about KeyListener, ActionListener, and Timer classes in the swing package.
1. How to Write an Action Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)
2. How to Write a Key Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)
3. How to Use Swing Timers (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Other Swing Features)

Try to follow some examples. You should be able to write your code better.

Syed.