I have a Exception (StackOverflowError)-CodePudding

I have this kind of error: Exception in thread "main" Exception in thread "main" Exception in thread "main" java.lang.StackOverflowError

My Code(actually by BroCode):


   public static void main(String[] args) {
       GameFrame frame = new GameFrame();

   }
}``` 

```import javax.swing.JFrame;

public class GameFrame extends JFrame {

   public GameFrame() {
       this.add(new GameFrame());
       this.setTitle("Snake");
       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       this.setResizable(false);
       this.pack();
       this.setVisible(true);
       this.setLocationRelativeTo(null);
   }
}```

```import javax.swing.JPanel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class GamePanel extends JPanel implements ActionListener {

   public GamePanel() {

   }
   @Override
   public void actionPerformed(ActionEvent e) {

   }
}```

CodePudding user response：

As @tkausl mentioned - you are calling new GameFrame() as infinity loop inside the constructor. These causes the StackOverflowException. If you want to have a JFrame in the GameFrame you should simple call the constructor of these class directly.

CodePudding user response：

In Java, the new keyword calls the constructor of the class. So when you do

public GameFrame() {
       this.add(new GameFrame());
       ...
}

you're recursively calling the GameFrame constructor "infinitely" many times (or as many times as needed to cause a StackOverflowError to be exact). If you want to access the current instance of a class, use the this keyword (https://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html). So your new code would become

public GameFrame() {
       this.add(this);
       ...
}