Having Trouble with a GUI Object class

Hey all, I'm new to Java and am attempting to create a connect four game. Cliché I know, but it had a few interesting problems that I wanted to learn to solve dealing with the swing class and also work through multidimensional arrays. Right now though i can't get my gui object class to work the proper way... was wondering if you could help?

Code:

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import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;
import javax.swing.*;
import javax.swing.plaf.basic.BasicOptionPaneUI.ButtonActionListener;

public class PlayConnect4 {

  public static void main(String[] args) {
    intializeGame();
    gameTypeGUI a = new gameTypeGUI();
  }

  private static void intializeGame() {
    String rows = JOptionPane.showInputDialog(null, "Input the "
                                                    + "number of rows");
    String columns = JOptionPane.showInputDialog(null, "Input the "
                                                      + "number of columns");
    Scanner row = new Scanner(rows);
    Scanner column = new Scanner(columns);
    int r = row.nextInt();
    int c = column.nextInt();

    Connect4Board board = new Connect4Board(r, c);

    Connect4Player p1 = new Connect4Player(0, "Player 1");
    Connect4Player p2 = new Connect4Player(0, "Player 2");

  }

  public class gameTypeGUI {

    JButton player, computer, remotePlayer;
    JFrame buttons;

    public gameTypeGUI() {
      player = new JButton("Play vs. another human");
      computer = new JButton("Play vs. Computer");
      remotePlayer = new JButton("Play vs. a reomte player");
      buttons = new JFrame();

      buttons.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      buttons.setLayout(
              new BorderLayout(25, 10));
      buttons.setLocation(
              250, 250);
      buttons.add(player, BorderLayout.WEST);

      buttons.add(remotePlayer, BorderLayout.CENTER);

      buttons.add(computer, BorderLayout.EAST);

      buttons.add(new JLabel("What type of game do you want to "
                        + "play?"), BorderLayout.NORTH);
      buttons.pack();
      buttons.setVisible(true);

    }
  }
}

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Oh, and the problem i'm getting is in line 12, I get the error, "non-static variable this cannot be referenced from a static context."

Why is the class gameTypeGUI nested inside of the PlayConnect4 class? Sure, I sometimes nest classes, but only for specific purposes, and rarely is the inner class a public class. I suggest you don't add the additional complexity and separate the two classes into their own files.

Also, when posting error messages, post the entire message, not a small snip of it or a paraphrased bit of it.

The reason I have the class nested is because I need the returns from the actionListener's that I want to implement on each button. I need those returns to keep running in the main code, and i couldn't get it to return properly from a separate java class, so i nested it instead.

here is the whole error.

Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
at java.util.Scanner.nextInt(Scanner.java:2119)
at Connect4Board.<init>(Connect4Board.java:67)
at PlayConnect4.intializeGame(PlayConnect4.java:34)
at PlayConnect4.main(PlayConnect4.java:20)
Java Result: 1

Quote:

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Originally Posted by jrdarkness

The reason I have the class nested is because I need the returns from the actionListener's that I want to implement on each button. I need those returns to keep running in the main code, and i couldn't get it to return properly from a separate java class, so i nested it instead.

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That's not a reason to nest classes, not at all. Perhaps it would be best for you to show your non-nested class and the specific problem you were having with it, since you should be using separate classes and files here.

Quote:

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here is the whole error.

Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
at java.util.Scanner.nextInt(Scanner.java:2119)
at Connect4Board.<init>(Connect4Board.java:67)
at PlayConnect4.intializeGame(PlayConnect4.java:34)
at PlayConnect4.main(PlayConnect4.java:20)
Java Result: 1

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Huh?? This is nothing at all like the "non-static variable this cannot be referenced from a static context." that you mentioned above. Please clarify things -- just what is your real error?