在旧 Java GUI Tic-Tac-Toe 上变得空白

Question

好吧，所以我想在Java上学习GUI，在我曾经有过的这本书上（已经6年了），我尝试复制他们的示例TicTacToe.java

是不是用的语句有点老了，还是我需要先了解一些东西再出去尝试这些东西，我实在想不通为什么屏幕上什么都没有。

这是我的代码（请原谅奇怪的名字和文字）：

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

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

public class FranzTicTacToe extends JFrame implements ActionListener
{
private Container c = getContentPane();
private JButton[][] gameBoard = new JButton[3][3];



private ImageIcon imageo = new ImageIcon("C:\Users\hftri\Downloads\tic.jpg");
private ImageIcon imagex = new ImageIcon("C:\Users\hftri\Downloads\tac.jpg");

private String turn = "Aloysius";
    boolean isGameOver = false;

    public void TicTacToe()
    {
        c = getContentPane();
        gameBoard = new JButton[3][3];
        imageo = new ImageIcon("C:\Users\hftri\Downloads\tic.jpg");
        imagex = new ImageIcon("C:\Users\hftri\Downloads\tac.jpg");
        isGameOver = false;
        c.setLayout(new GridLayout(3,3));
        setTitle("Harambe");
        setBounds(250, 250, 300, 300);

        for(int column=0; column < 3; column++)
        {
            for(int row=0; row < 3; row++)
            {
                gameBoard[column][row] = new JButton();
                c.add(gameBoard[column][row]);
                gameBoard[column][row].addActionListener(this);
            }
        }
    }
    public void actionPerformed(ActionEvent e)
    {
        if(isGameOver)
            return;

        JButton pressedButton = (JButton)e.getSource();
        int pressedColumn = -1, pressedRow = -1;

        for(int column=0; column < 3; column++)
        {
            for(int row=0; row < 3; row++)
            {
                if(gameBoard[column][row] == pressedButton)
                {
                    pressedColumn = column;
                    pressedRow = row;
                }
            }
        }

        //Game START

        if(gameBoard[pressedColumn][pressedRow].getIcon() != null)
        {
            return;
        }

        if(turn.equals("Aloysius"))
        {
            gameBoard[pressedColumn][pressedRow].setIcon(imagex);
            turn = "Johpit";
        }

        else
        {
            gameBoard[pressedColumn][pressedRow].setIcon(imageo);
            turn = "Aloysius";
        }

        if(checkRow(pressedRow, imageo) || checkColumn(pressedColumn, imageo) || checkDiagonals(imageo))
        {
            isGameOver = true;
            JOptionPane.showMessageDialog(FranzTicTacToe.this, "Aloysius is skrub", "Result", JOptionPane.INFORMATION_MESSAGE);
            turn = "Johpit";

            playAgain();
        }

        if(checkRow(pressedRow, imagex) || checkColumn(pressedColumn, imagex) || checkDiagonals(imagex))
        {
            isGameOver = true;
            JOptionPane.showMessageDialog(FranzTicTacToe.this, "Johpit is skrub", "Result", JOptionPane.INFORMATION_MESSAGE);
            turn = "Aloysius";

            playAgain();
        }

        if(!isGameOver)
        {
            boolean tie = true;

                for(int column=0; column < 3; column++)
                {
                    for(int row=0; row < 3; row++)
                    {
                        if(gameBoard[column][row].getIcon() == null)
                        {
                            tie = false;
                            break;
                        }
                    }
                }
                if(tie)
                {
                    JOptionPane.showMessageDialog(FranzTicTacToe.this, "Both of you are fukin skrubs", "Result", JOptionPane.INFORMATION_MESSAGE);
                    isGameOver = true;

                    playAgain();
                }
            }

            if(!isGameOver)
            {
                setTitle(turn + "'s turn");
            }
        }
        boolean checkRow(int row, Icon player)
        {
            for(int column=0; column < 3; column++)
            {
                if(gameBoard[column][row].getIcon() != player)
                {
                    return false;
                }
            }
            return true;
        }

        boolean checkColumn(int column, Icon player)
        {
            for(int row=0; row < 3; row++)
            {
                if(gameBoard[column][row].getIcon() != player)
                {
                    return false;
                }
            }
            return true;
        }

        boolean checkDiagonals(Icon player)
        {
            if(gameBoard[1][1].getIcon() != player)
            return false;

            if(gameBoard[0][0].getIcon() == player && gameBoard[2][2].getIcon() == player)
            {
                return true;
            }

            return false;
        }

        //Game Restarting Option

        void playAgain()
        {
            Object[] options = {"Yes", "No"};
            int n = JOptionPane.showOptionDialog(FranzTicTacToe.this, "Pusta again?", "Query", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);

            if(n == JOptionPane.YES_OPTION)
            {
                dispose();
                FranzTicTacToe game = new FranzTicTacToe();
                game.setVisible(true);
            }
            else
            {
                System.exit(0);
            }
        }
        public static void main(String[] args)
        {
            FranzTicTacToe game = new FranzTicTacToe();
            game.addWindowListener(new WindowAdapter()
            {
                public void windowClosing(WindowEvent e)
                {
                    System.exit(0);
                }
            });

            game.setVisible(true);
        }
    }

出于好奇和乐趣，我将 "Aloysius" 设为 x 的值，将 "Johpit" 设为 o 的值。

无论如何，我是 Java 中 GUI 的新手，我想尝试一下，这样我就可以慢慢学习它的每个部分。所有这些代码显示的都是空白 window。有什么想法吗？

谢谢:)

Answer 1

您缺少构造函数。现在它使用默认的构造函数，实际上什么都不做。这可能是一个拼写错误，但为了理解。如果没有声明构造函数，它将使用 Object class.
中的默认构造函数构造函数还需要具有与 class 完全相同的名称。因此，将您的 TicTacToe 方法更改为 FranzTicTacToe 构造函数

 public void TicTacToe() // needs to be public FranzTicTacToe()
    {
        c = getContentPane();
        gameBoard = new JButton[3][3];
        imageo = new ImageIcon("C:\Users\hftri\Downloads\tic.jpg");
        imagex = new ImageIcon("C:\Users\hftri\Downloads\tac.jpg");
        isGameOver = false;
        c.setLayout(new GridLayout(3,3));
        setTitle("Harambe");
        setBounds(250, 250, 300, 300);
    for(int column=0; column < 3; column++)
    {
        for(int row=0; row < 3; row++)
        {
            gameBoard[column][row] = new JButton();
            c.add(gameBoard[column][row]);
            gameBoard[column][row].addActionListener(this);
        }
    }
}

Answer 2

您重命名了 class，但忘记重命名构造函数，然后以错误的方式修复了它。长话短说：

public void TicTacToe()

应该是

public FranzTicTacToe()

在旧 Java GUI Tic-Tac-Toe 上变得空白

Getting Blank on Old Java GUI Tic-Tac-Toe

java

user-interface

window

frame

tic-tac-toe