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  1. import javax.swing.* ;
  2. import java.awt.Color ;
  3. import java.awt.Graphics ;
  4. import java.awt.Point ;
  5. import java.awt.event.* ;
  6.  
  7. public class Timer extends JFrame implements KeyListener, Runnable
  8. {
  9.   public enum MoveDirection
  10.   {
  11.     UP, DOWN, LEFT, RIGHT, INITIAL
  12.   }
  13.  
  14.   public boolean isRunnung = true ;
  15.   public Point head = new Point( 100, 100 ) ;
  16.   public Point tail = new Point( 100, 100 ) ;
  17.   public MoveDirection currentDirection = MoveDirection.INITIAL ;
  18.   public static final int RECT_SIZE = 20 ;
  19.   public static final int SLEEP_SEC = 500 ;
  20.  
  21.   Thread thread = null ;
  22.  
  23.   public Timer()
  24.   {
  25.     thread = new Thread( this ) ;
  26.     thread.start() ;
  27.     setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE ) ;
  28.     setSize( 500, 500 ) ;
  29.     SnackPanel snack = new SnackPanel() ;
  30.     snack.setBackground( Color.white ) ;
  31.     add( snack ) ;
  32.     addKeyListener( this ) ;
  33.     setVisible( true ) ;
  34.   }
  35.  
  36.   public static void main( String[] args )
  37.   {
  38.     new Timer() ;
  39.   }
  40.  
  41.   public class SnackPanel extends JPanel
  42.   {
  43.     @Override
  44.     public void paintComponent( Graphics graphics )
  45.     {
  46.  
  47.       super.paintComponent( graphics ) ;
  48.       graphics.clearRect( head.x, head.y, RECT_SIZE, RECT_SIZE ) ;
  49.  
  50.       if ( currentDirection == MoveDirection.UP )
  51.         head.setLocation( head.x, head.y - RECT_SIZE ) ;
  52.       else if ( currentDirection == MoveDirection.DOWN )
  53.         head.setLocation( head.x, head.y + RECT_SIZE ) ;
  54.       else if ( currentDirection == MoveDirection.LEFT )
  55.         head.setLocation( head.x - RECT_SIZE, head.y ) ;
  56.       else if ( currentDirection == MoveDirection.RIGHT )
  57.         head.setLocation( head.x + RECT_SIZE, head.y ) ;
  58.  
  59.       graphics.fillRect( head.x, head.y, RECT_SIZE, RECT_SIZE ) ;
  60.     }
  61.   }
  62.  
  63.   @Override
  64.   public void keyPressed( KeyEvent e )
  65.   {
  66.     // TODO Auto-generated method stub
  67.  
  68.   }
  69.  
  70.   @Override
  71.   public void keyReleased( KeyEvent e )
  72.   {
  73.     // TODO Auto-generated method stub
  74.  
  75.   }
  76.  
  77.   @Override
  78.   public void keyTyped( KeyEvent e )
  79.   {
  80.     isRunnung = false ;
  81.     MoveDirection nextDirection = NextDirection( e ) ;
  82.     if ( nextDirection != null )
  83.     {
  84.       if ( currentDirection != nextDirection )
  85.       {
  86.         currentDirection = nextDirection ;
  87.         repaint() ;
  88.       }
  89.     }
  90.  
  91.     isRunnung = true ;
  92.   }
  93.  
  94.   public MoveDirection NextDirection( KeyEvent e )
  95.   {
  96.  
  97.     if ( e.getKeyChar() == '5' )
  98.       return MoveDirection.UP ;
  99.     else if ( e.getKeyChar() == '2' )
  100.       return MoveDirection.DOWN ;
  101.     else if ( e.getKeyChar() == '1' )
  102.       return MoveDirection.LEFT ;
  103.     else if ( e.getKeyChar() == '3' )
  104.       return MoveDirection.RIGHT ;
  105.     else
  106.       return null ;
  107.  
  108.   }
  109.  
  110.   @Override
  111.   public void run()
  112.   {
  113.     while ( true )
  114.     {
  115.       if ( isRunnung )
  116.         repaint() ;
  117.  
  118.       try
  119.       {
  120.         thread.sleep( SLEEP_SEC ) ;
  121.       }
  122.       catch ( InterruptedException e )
  123.       {
  124.         e.printStackTrace() ;
  125.       }
  126.     }
  127.   }
  128. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:7: class Timer is public, should be declared in a file named Timer.java
public class Timer extends JFrame implements KeyListener, Runnable
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/oFE5C
language:
Java (HotSpot 12)
created:
13 years ago
visibility:
secret

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