Question

我目前正在尝试制作基本的Java Chess游戏，其中ChessBoard初始化并填充ChessSquares。每次我将窗口设置为可见时，除非盘旋，否则每个JButton都不会显示。我该如何阻止它？

器ChessBoard

public class ChessBoard extends JFrame implements ActionListener {

    private JPanel p = new JPanel();
    private ChessSquare[][] board = new ChessSquare[8][8];

    public ChessBoard(){

        //Specify frame window.
        setSize(640,640);
        setTitle("Chess");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add panel to frame window.
        p.setLayout(new GridLayout(8,8));
        setContentPane(p);

        //Populate Chess Board with squares.
        for(int y=0; y<8; y++){
            for(int x=0; x<8; x++){
                board[x][y] = new ChessSquare(x,y);
                board[x][y].addActionListener(this);
                p.add(board[x][y]);
            }
        }

        //Show window.
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        ChessSquare s = (ChessSquare) e.getSource();
        //...
    }
}

ChessSquare

import javax.swing.*;

public class ChessSquare extends JButton{

    private int x, y;

    public ChessSquare(int x, int y){
        this.x = x;
        this.y = y;
    }


    public int getX(){
        return x;
    }

    public int getY(){
        return y;
    }
}

On Render | After Mouse Over

Answer 1

向@Override / getX()方法添加getY()表示法，以获取编译器错误消息。这反过来表明：

这些方法已经存在。
搞乱现有的实现可能是不明智的。

最终，我很少看到覆盖组件类的好理由，在这种情况下，它是一个（证明 - 给出结果）坏主意。

此MCVE通过用ChessSquare类中的标准按钮替换它来支持问题在ChessBoard组件中。尽管代码中存在一些其他问题（例如，没有调用pack()并猜测GUI所需的大小，在这种情况下，会导致棋盘，它的工作正常。不是正方形）¹。

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

public class ChessBoard extends JFrame implements ActionListener {

    private JPanel p = new JPanel();
    private JButton[][] board = new JButton[8][8];

    public ChessBoard() {

        //Specify frame window.
        setSize(640, 640);
        setTitle("Chess");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add panel to frame window.
        p.setLayout(new GridLayout(8, 8));
        setContentPane(p);

        //Populate Chess Board with squares.
        for (int y = 0; y < 8; y++) {
            for (int x = 0; x < 8; x++) {
                board[x][y] = new JButton(x + "," + y);
                board[x][y].addActionListener(this);
                p.add(board[x][y]);
            }
        }

        //Show window.
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new ChessBoard();
            }
        });
    }

    public void actionPerformed(ActionEvent e) {
        JButton s = (JButton) e.getSource();
        //...
    }
}

“ not square ”与Making a robust, resizable Swing Chess GUI中的棋盘相对。

JButton在悬停Java Swing时显示

1 个答案: