java - 如何避免在已有文本的按钮上写入文本？ java

Question

我的项目中有一个方法，它从列表中随机选择一个按钮，然后在其上写入给定的文本。我遇到的问题是，由于它随机选择按钮，因此即使按钮上已经写有文本，它也会在按钮上写入文本。我想要的是，让这段代码选择一个按钮，然后检查上面是否已经写有文本，如果有，那么我希望它重复自身并选择另一个随机按钮，直到找到并写入给定的文本在之前没有文字的按钮上。

public class random{

    public static String text2 = "text2";

    public void static main(String[] args){
        JButton button = new JButton("Empty");
        JButton button1 = new JButton("Empty");
        JButton button2 = new JButton("Empty");

        randomButton(button,button1, button2);
    }
    public void randomButton(JButton button1, JButton button2, JButton button3){
        String text = "text";
        JButton[] arr = {button1, button2, button3};
        Random r = new Random();
        JButton b = arr[r.nextInt(arr.length)];
        b.setText(text);
        b.setEnabled(false);
    }
}

按钮上可以包含三个文本之一 - Empty、text1 或 text2。

我想要做的是，如果在调用 randomButton 方法时随机选择按钮，我希望它检查所选按钮是否已经有 text1 或 text2，如果有，那么我希望它重新选择另一个随机按钮直到找到一个写有 Empty 的按钮，然后将其替换为 text1。

我尝试过 do while 循环、if 语句和 while 循环，但它不起作用，也许是因为我的逻辑错误，但我不确定。下面，我粘贴了我的尝试之一，但它不起作用。

do {
    String text = "text";
    JButton[] arr = {button1, button2, button3};
    Random r = new Random();
    JButton b = arr[r.nextInt(arr.length)];
    if (b.getText() != "text" || b.getText() != "text2") {
        b.setText(text);
        b.setEnabled(false);
    } else {
        String text = "text";
        JButton[] arr = {button1, button2, button3};
        Random r = new Random();
        JButton b = arr[r.nextInt(arr.length)];
        b.setText(text);
        b.setEnabled(false);
    }
} while (b.getText() == text);

Answer 1

看看这个。有一个 JButton 的二维数组。当您单击随机按钮时，它会检查随机索引处的按钮是否有 X，如果没有，它将设置文本。如果有什么不明白的地方请告诉我

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;

public class RandomButton {

    JButton[][] buttons = new JButton[10][10];
    JButton randomButton = new JButton("Choose Random Button");

    public RandomButton() {
        JPanel panel = new JPanel(new GridLayout(10, 10));
        initButtons(panel);

        randomButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {

                while (true) {
                    int[] indices = getRandom();
                    int i = indices[0];
                    int j = indices[1];
                    if (!"X".equals(buttons[i][j].getText())) {
                        buttons[i][j].setForeground(Color.BLUE);
                        buttons[i][j].setText("X");
                        break;
                    }
                }
            }
        });

        randomButton.setBorder(new LineBorder(Color.black, 5));
        panel.setBorder(new LineBorder(Color.BLACK, 5));

        JFrame frame = new JFrame("Random Button");
        frame.add(panel);
        frame.pack();
        frame.add(randomButton, BorderLayout.PAGE_END);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public int[] getRandom() {
        Random rand = new Random();
        int i = rand.nextInt(10);
        int j = rand.nextInt(10);
        int[] indices = {i, j};
        return indices;
    }

    private void initButtons(JPanel panel) {
        for (int i = 0; i < buttons.length; i++) {
            for (int j = 0; j < buttons[i].length; j++) {
                buttons[i][j] = new JButton("O");
                panel.add(buttons[i][j]);
            }
        }
    }

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

<小时/>

更新

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;

public class RandomButton {

    JButton[][] buttons = new JButton[10][10];
    JButton randomButton = new JButton("Choose Random Button");


    public RandomButton() {
        JPanel panel = new JPanel(new GridLayout(10, 10));
        initButtons(panel);
        panel.setBorder(new LineBorder(Color.BLACK, 5));

        JFrame frame = new JFrame("Random Button");
        frame.add(panel);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private class ButtonListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            JButton button = (JButton)e.getSource();
            System.out.println(button.getText());
        }
    }


    private void initButtons(JPanel panel) {
        ButtonListener listener = new ButtonListener();
        int count = 1;
        for (int i = 0; i < buttons.length; i++) {
            for (int j = 0; j < buttons[i].length; j++) {
                JButton button = new JButton(String.valueOf(count));
                buttons[i][j] = button;
                button.addActionListener(listener);
                panel.add(button);
                count++;
            }
        }
    }

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