Question

我是编码的新手，尝试为班级创建一个简单的井字游戏，因此我想起了这一点，因为我需要使用GUI来使开发板变成一个按钮网格。不幸的是，我在让按钮执行任何操作时遇到问题。我想当某人单击它使其变为X，然后下一个单击它的人变为O。任何帮助都将非常棒。

import javax.swing.*;
import javax.swing.JFrame;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.JOptionPane;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.layout.BorderPane;
import javafx.geometry.Pos;
import javafx.geometry.Insets;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;
import java.awt.font.*;
import javafx.animation.TranslateTransition;
import javafx.scene.layout.GridPane;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;

public class ShadowT extends JFrame { 

   //creates 9 buttons
   private static JButton buttons[] = new JButton[9]; 
   //sets counter for amount of times a button has been clicked on
   public static int counter = 0;  
   public static String letter;

   public static void main(String[] args){
       //creates grid of 3x3
       int rows = 3;
       int cols = 3;
       ShadowT grid = new ShadowT(rows,cols);
       grid.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       grid.pack();
       grid.setVisible(true);
   }


   public ShadowT(int rows, int cols){
       //creates pane with grid and adds in the buttons 
       Container pane = getContentPane();
       pane.setLayout(new GridLayout(rows,cols));
       for(int i = 0; i < 9; i++){
           JButton button = new JButton(Integer.toString((i+1)));
           pane.add(button); 
       }
   }  
}

Answer 1

每个JButton需要一个ActionListener（可能是相同的）以及一个自定义的actionPerformed方法。

例如，对于一个名为button1的JButton，您可以编写

button1.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        /* do some stuff when the button is clicked */
    }
});

另请参见Java教程中的How to Write an Action Listener，如果需要，请参阅How to add action listener that listens to multiple buttons。

这里是一个例子：

import java.awt.Container;
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.JOptionPane;

public class Grid extends JFrame implements ActionListener {
    private static JButton buttons[][];
    public static int counter = 0;

    public static void main(String[] args){
        Grid grid = new Grid(3, 3);
        grid.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        grid.pack();
        grid.setVisible(true);
    }

    public Grid(int rows, int cols) {
        Container pane = getContentPane();
        pane.setLayout(new GridLayout(rows, cols));
        buttons = new JButton[rows][cols];

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                JButton button = new JButton(i + "," + j);

                button.addActionListener(this);
                pane.add(button);
                buttons[i][j] = button;
            }
        }
    }

    public void actionPerformed(ActionEvent e) {
        Object o = e.getSource();
        if (o instanceof JButton) {
            JOptionPane.showMessageDialog(null, ((JButton)o).getText());
        }
    }
}

Answer 2

这是一个简单的Java GUI应用程序示例-并非完美，但仅用于演示您需要的内容。

您需要实现ActionListener并编写实现ActionListener时所需的actionPerformed（）。

import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; public class HandleActionEventsForJButton extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; public HandleActionEventsForJButton() { // set flow layout for the frame this.getContentPane().setLayout(new FlowLayout()); JButton button1 = new JButton("Yes"); JButton button2 = new JButton("No"); //set action listeners for buttons button1.addActionListener(this); button2.addActionListener(this); //add buttons to the frame add(button1); add(button2); } @Override public void actionPerformed(ActionEvent ae) { String action = ae.getActionCommand(); if (action.equals("Yes")) { System.out.println("Yes Button pressed!"); } else if (action.equals("No")) { System.out.println("No Button pressed!"); } } private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new HandleActionEventsForJButton(); //Display the window. frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }

如何将ActionEvent添加到JButtons？井字游戏

2 个答案: