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

public class FirstAnimation { 
        private static final int X_SIZE = 300, Y_SIZE = 300; 
        private static int x=150,y=150;   // the item being animated

        public static void main(String[ ] args) { 
				JFrame frame = new JFrame("Graphics Skeleton"); 
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
                frame.setSize(X_SIZE, Y_SIZE); 
                GraphicsPanel panel = new GraphicsPanel( ); 
                frame.add(panel); 
                frame.setVisible(true); 
	 			Random g=new Random();
	 			long i;
	 			while(true) {
					x+=g.nextInt(7)-3; y+=g.nextInt(7)-3;
	              	panel.repaint();
	              	for(i=0;i<250000000l;i++);
        		}
        } 

       private static class GraphicsPanel extends JPanel { 

             public void paintComponent(Graphics g) { 
                    super.paintComponent(g); 
	    		    g.setColor(Color.black);
                    g.fillRect(0,0,X_SIZE,Y_SIZE);
                    g.setColor(Color.red);
	        		if(x<25) x=25;
	        		else if(x>275) x=275;
                    if(y<25) y=25;
			        else if(y>275) y=275;
                    g.fillOval(x-2,y-2,5,5);
			} 
    } 
}