java - painting

 
 class A extends Thread 
 { 
 B b; 
 public A(B b) 
 { 
   this.b=b; 
 } 
 public run() 
 { 
  this.b.robcos; 
 } 
 } 
  
 class B extends JPanel 
 { 
 public paintcomponent(Graphics g) 
 { 
 super.paintComponent(g); 
 Graphics2D g2d = (Graphics2D)g; 
  
 tutaj wykorzystuję g2d to rysowania 
 } 
 }  
 class C //wywołanie  
 { 
    public C() 
  
    { 
  
 B b=new B(); 
 A a=new A(b); 
 a.start(); 
 A a2=new A(b); 
 a2.start(); 
    } 
  
 } 
  
  
  
  
 

 
  
  
 class Car extends Thread 
 { 
     EllipseTrace et; 
  
     public Car(EllipseTrace et) 
     { 
     this.et = et;     
     start(); 
     } 
     @Override 
     public void run() 
     { 
         Graphics g = et.getGraphics(); 
         g.setColor(Color.black); 
         g.fillRect(20,00,130,150); 
         et.repaint(); 
     } 
 }