Snake Game Demo

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

class node{
    int x,y;
    JLabel part;
    node next;
    node(String val)
    {
        next=null;
        this.part=new JLabel(val);
    }
    node(String val,int x,int y)
    {
        next = null;
        this.part = new JLabel(val);
        this.x=x;
        this.y=y;
        part.setBounds(x,y,30,30);
    }
    public void setLabel(int x, int y)
    {
        this.x=x;
        this.y=y;
        this.part.setBounds(x,y,30,30);
    }
    public void setLabel()
    {
        this.part.setBounds(x,y,30,30);
    }
}

class move extends JFrame implements KeyListener
{
    node head;
    JPanel p;
    Container ctr = this.getContentPane();
    int xTemp, yTemp;
    boolean u,d,l,r;
    move()
    {
        setTitle("Suraj Programs");

        head = new node(">",50,50);
        head.next = new node("=",10,10);
        p = new JPanel();

        p.setLayout(null);
        this.addKeyListener(this);

        u=l=d=false;
        r=true;

        this.setVisible(true);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setSize(599,600);

        p.add(head.part);
        ctr.add(p);

        while(true)
        {
            ctr.setSize(600,599);
            p.removeAll();
            System.out.println("head "+head.x+" "+head.y);
            System.out.println("part "+head.next.x+" "+head.next.y);
            xTemp = head.x;
            yTemp = head.y;
            moveHead();
            head.setLabel();
            p.add(head.part);
            System.out.println("head1 "+head.x+" "+head.y);
            System.out.println("part1 "+head.next.x+" "+head.next.y);
            head.next.x=xTemp;
            head.next.y = yTemp;
            head.next.setLabel();
            p.add(head.next.part);
            try{Thread.sleep(1000);}
            catch(Exception e)
            {
                head.part.setText(String.valueOf(e));
            }
            ctr.setSize(599,600);
        }
    }
    public void moveHead()
    {
        if(u)
                head.y-=5;
            if(d)
                head.y+=5;
            if(r)
                head.x+=5;
            if(l)
                head.x-=5;
            if(head.x>500)
                head.x=0;
            if(head.x<0)
                head.x=500;
            if(head.y>500)
                head.y=0;
            if(head.y<0)
                head.y=500;
    }

    public void keyPressed(KeyEvent e)
    {
        int i = e.getKeyCode();
        if(u || d)
        {
            if(i==KeyEvent.VK_LEFT)
            {
                l=true; r=u=d=false;
                head.part.setText("<");
            }
            if(i==KeyEvent.VK_RIGHT)
            {
                r=true; u=l=d=false;
                head.part.setText(">");
            }
        }
        else
        {
            if(i== KeyEvent.VK_UP)
            {
                u=true; r=l=d=false;
                head.part.setText("^");
            }
            if(i==KeyEvent.VK_DOWN)
            {
                d=true; r=l=u=false;
                head.part.setText("v");
            }
        }
    }
    public void keyTyped(KeyEvent e)
    {
    }
    public void keyReleased(KeyEvent e)
    {
    }
}
class suraj1
{
    public static void main(String arg[])
    {
        move s = new move();
    }
}