import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class box{
    public static String b1state = "A";
    public static String b2state = "S";
    public static String b3state = "D";
    public static String b4state = "F";
    public static String b5state = "G";
    public static String b6state = "H";
    public static String b7state = "J";
    public static String b8state = "K";
    public static String b9state = "Q";

    public static void main(String[] args){
        JFrame frame = new JFrame("Tic Tac Toe");
        frame.setSize(500,500);
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel p = new JPanel();

        JButton b1 = new JButton(b1state);
        b1.setLocation(100,  50);
        JButton b2 = new JButton(b2state);
        b2.setLocation(150, 50);
        JButton b3 = new JButton(b3state);
        b3.setLocation(200, 50);
        JButton b4 = new JButton(b4state);
        b4.setLocation(100, 100);
        JButton b5 = new JButton(b5state);
        b5.setLocation(150, 100);
        JButton b6 = new JButton(b6state);
        b6.setLocation(200, 100);
        JButton b7 = new JButton(b7state);
        b7.setLocation(100, 150);
        JButton b8 = new JButton(b8state);
        b8.setLocation(150, 150);
        JButton b9 = new JButton(b9state);
        b9.setLocation(200, 150);

        b1.setSize(50, 50);
        b2.setSize(50, 50);
        b3.setSize(50, 50);
        b4.setSize(50, 50);
        b5.setSize(50, 50);
        b6.setSize(50, 50);
        b7.setSize(50, 50);
        b8.setSize(50, 50);
        b9.setSize(50, 50);

        p.add(b1);
        p.add(b2);
        p.add(b3);
        p.add(b4);
        p.add(b5);
        p.add(b6);
        p.add(b7);
        p.add(b8);
        p.add(b9);

        frame.add(p);
        frame.add(b1);
        frame.add(b2);
        frame.add(b3);
        frame.add(b4);
        frame.add(b5);
        frame.add(b6);
        frame.add(b7);
        frame.add(b8);
        frame.add(b9);
    }

当我运行这个有时它的工作，但其他时候它只是打开窗口与整个按钮占用屏幕！请救救我！