MainFrame.java

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

public class MainFrame extends JFrame {
	MainFrame(){
		Rysunek r = new Rysunek();
		setSize(500,500);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
		add(r);
	}
	
	public static void main(String[] args){
		EventQueue.invokeLater(new Runnable(){
			public void run(){
				new MainFrame();
			}
		});
	}

}

class Rysunek extends JPanel {
   private JTextField xT = new JTextField(5);
   private JTextField yT = new JTextField(5);
   private Prostokat pr = new Prostokat(100,200,250,250);
   private int x = 0;
   private int y = 0;
	Rysunek(){
	   super();
	   setSize(500,500);
	   JPanel p = new JPanel();
	   add(new JLabel("x : "));
	   p.add(xT);
	   p.add(new JLabel("y: "));
	   p.add(yT);
	   add(p,BorderLayout.NORTH);
	   super.setFocusable(true);
	   addMouseMotionListener(new MouseMotionListener(){
		   
			public void mouseDragged(MouseEvent arg0) {}
			public void mouseMoved(MouseEvent e) {
				x = e.getX();
				y = e.getY();
				
				xT.setText(Integer.toString(x));
				yT.setText(Integer.toString(y));
				
				if(pr.isInside(x, y))
					pr.setColor(true);
				else
					pr.setColor(false);
				repaint();
			} 
	   });
	   
	   addKeyListener(new KeyListener(){
		public void keyPressed(KeyEvent e) {
			// TODO Auto-generated method stub
			switch(e.getKeyCode()){
			case KeyEvent.VK_DOWN : pr.move(0, 5);break;
			case KeyEvent.VK_UP : pr.move(0, -5);break;
			case KeyEvent.VK_LEFT : pr.move(-5, 0);break;
			case KeyEvent.VK_RIGHT : pr.move(5,0);break;
			}
			if(pr.isInside(x, y))
				pr.setColor(true);
			else
				pr.setColor(false);	
			repaint();
		}
		public void keyReleased(KeyEvent arg0) {}
		public void keyTyped(KeyEvent arg0) {}
		});
	   
	   addMouseListener(new MouseListener(){

		public void mouseClicked(MouseEvent arg0) {}
		public void mouseEntered(MouseEvent e) {
			
		}
		public void mouseExited(MouseEvent arg0) {}
		public void mousePressed(MouseEvent arg0) {}
		public void mouseReleased(MouseEvent arg0) {}
		});
	   
   }
	
	
	public void paintComponent(Graphics g){
		super.paintComponent(g);
		pr.paint(g);
	}
}

class Prostokat{
	private int height;
	private int width;
	private int x;
	private int y;
	private boolean color = false;
	
	Prostokat(int height, int width, int x, int y){
		this.height = height;
		this.width = width;
		this.x = x;
		this.y = y;
	}
	
	public boolean isInside(int x, int y){
		if((this.x - width/2) <x && x < (this.x + width/2) && (this.y - height/2) < y&& y<(this.y + height/2))
				return true;
		else
			return false;
	}
	
	public void setColor(boolean p){
		color = p;
	}
	
	public void move(int x, int y){
		this.x+=x;
		this.y+=y;
	}
	
	public void paint(Graphics g){
		if(color){
			g.setColor(Color.BLUE);
			g.fillRect(x-width/2, y-height/2, width, height);
		}else{
			g.setColor(Color.BLACK);
			g.drawRect(x-width/2, y-height/2, width, height);
		}
	}
}