Java Compiler liefert Fehler

import javax.swing.JFrame;

import javax.swing.JLabel;

//import statements

//Check if window closes automatically. Otherwise add suitable code

public class HelloWorldFrame extends JFrame {

  public static void main(String args[]) {

    new HelloWorldFrame();

  }

  HelloWorldFrame() {

    JLabel jlbHelloWorld = new JLabel("Hello World");

    add(jlbHelloWorld);

    this.setSize(100, 100);

    // pack();

    setVisible(true);

  }

}

Fenster.java:6: error: class HelloWorldFrame is public, should be declared in a file named HelloWorldFrame.java

public class HelloWorldFrame extends JFrame {

       ^

1 error