Misterious problem

Hello, I was creating a simple game, and I wanted to test program. But when I press "Run" on eclipse, nothing happens, "Terminate" button is active so I think, that program running. Here is my code:

Code :

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import javax.swing.*;
 
public class MainClass {
 
	public static void main(String[] args) {
		JFrame frame = new JFrame("Catch Paulenas");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().add(new GameClass());
		frame.setSize(400,400);
		frame.setVisible(true);
	}
 
}

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Code :

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import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Random;
 
public class GameClass extends JPanel{
 
	//Declaring variables
	private int numberOfHits;
	private JLabel resultsBar;
	private BufferedImage target;
	private int targetX;
	private int targetY;
	private Timer timer;
	private int tryX;
	private int tryY;
	private Random rand;
 
	//Creating constructor, setting everything default
	public GameClass(){
		numberOfHits = 0;
		setLayout(new BorderLayout());
		setBackground(Color.WHITE);
		rand = new Random();
		getReady();
	}
 
	//Continue get ready for game
	private void getReady(){
		try{
			target = ImageIO.read(new File("target.jpg"));
		}catch(IOException e){}
 
		resultsBar = new JLabel("Number of hits "+ numberOfHits);
		add(BorderLayout.SOUTH, resultsBar);
		addMouseListener(new PanelListener());
		playGame();
	}
 
	//Playing game
	private void playGame(){
		while(numberOfHits < 20){
			timer = new Timer(rand.nextInt(2000)+1000, new TimerListener());
		}
	}
 
	public void paintComponent(Graphics g){
		g.drawImage(target,targetX,targetY,null);
	}
 
	//Listener for pressing buttons
	private class PanelListener implements MouseListener{
 
		public void mouseClicked(MouseEvent e) {
			tryY = e.getY();
			tryX = e.getX();
			if(tryY == targetY || tryX == targetX){
				numberOfHits++;
			}
		}
		public void mouseEntered(MouseEvent arg0) {}
		public void mouseExited(MouseEvent arg0) {}
		public void mousePressed(MouseEvent arg0) {}
		public void mouseReleased(MouseEvent arg0) {}
 
	}
 
	//Listener for timer
	private class TimerListener implements ActionListener{
 
		public void actionPerformed(ActionEvent e) {
			targetX = rand.nextInt(400)+1;
			targetY = rand.nextInt(380)+1;
			repaint();
		}
 
	}
}

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Maybe you can see where is the problem, because with syntax is everything good, no errors.

In your playGame() method: you loop until numberOfHits is less than 20, but you never increment numberOfHits in the loop, so it will always be less than 20. So, you've got an infinite loop.

Add some println's in there to see what is being executed....Hint: see the playGame method...the while loop will continue indefinitely