JButton ActionListener (Java 8 JDK 1.8.0_74) 不工作

Question

我正在制作一个程序来从任何文件中删除注释行，我刚刚完成了主 GUI 并向我的 JButtons 添加了两个动作侦听器，然后一切都崩溃了。我觉得我在某个地方犯了一个非常愚蠢的错误，但我不知道在哪里。有任何想法吗？（主要区域被注释掉）

import javax.swing.plaf.basic.BasicOptionPaneUI.ButtonActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JTextField;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.Box;
import java.awt.event.ActionListener;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Dimension;
import java.awt.Component;
import java.awt.Container;
import java.awt.Toolkit;
import java.awt.Label;
import java.awt.Font;

public class ReplaceComments{
    public static void main(String[]args){
        createInitialWindow();
    }
    public static void createInitialWindow(){
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        int w = (int)screenSize.getWidth();
        int h = (int)screenSize.getHeight();
        System.out.println("Width: " + w +  "\nHeight: " + h + "\nCreating customized window...");
        JLabel explanation1 = new JLabel("Welcome to Comment Replacer 1.0!");
            explanation1.setFont(new Font("Verdana", Font.PLAIN, w/80));
            explanation1.setAlignmentX(Component.CENTER_ALIGNMENT);            
        JLabel explanation2 = new JLabel("Simply paste in the file you want");
            explanation2.setFont(new Font("Verdana", Font.PLAIN, w/80));
            explanation2.setAlignmentX(Component.CENTER_ALIGNMENT);
        JLabel explanation3 = new JLabel("to remove comments from, and the");
            explanation3.setFont(new Font("Verdana", Font.PLAIN, w/80));
            explanation3.setAlignmentX(Component.CENTER_ALIGNMENT);
        JLabel explanation4 = new JLabel("folder it should output to.");
            explanation4.setFont(new Font("Verdana", Font.PLAIN, w/80));
            explanation4.setAlignmentX(Component.CENTER_ALIGNMENT);
        JLabel Source = new JLabel("Source: ");
            Source.setFont(new Font("Verdana", Font.PLAIN, w/80));
        JTextField source = new JTextField(w/130);
            source.setFont(new Font("Verdana", Font.PLAIN, w/80));
        JLabel Output = new JLabel("Output: ");
            Output.setFont(new Font("Verdana", Font.PLAIN, w/80));
        JTextField output = new JTextField(w/130);
            output.setFont(new Font("Verdana", Font.PLAIN, w/80));

        /*       \/  This Part  \/       */

        JButton replace = new JButton("Replace");
            replace.setFont(new Font("Verdana", Font.PLAIN, w/80));
            replace.setSize(new Dimension(w/8,h/8));
            replace.addActionListener(new CustomActionListener(){  /*********************/
                public void actionPerformed(ActionEvent e){        /* Added this action */
                    replaceButtonClicked();                        /*  listener and it  */
                }                                                  /*   all broke :3    */
            });                                                    /*********************/
        JButton cancel = new JButton("Cancel");
            cancel.setFont(new Font("Verdana", Font.PLAIN, w/80));
            cancel.setSize(new Dimension(w/8,h/8));
            cancel.addActionListener(new CustomActionListener(){   /*********************/
                public void actionPerformed(ActionEvent e){        /* Added this action */
                    cancelButtonClicked();                         /*  listener and it  */
                }                                                  /*   all broke :3    */
            });                                                    /*********************/

        /*       /\  This Part  /\       */

        ButtonGroup screen1 = new ButtonGroup();
            screen1.add(replace);
            screen1.add(cancel);
        Box info = Box.createVerticalBox();
            info.add(Box.createVerticalStrut(w/100));
            info.add(explanation1);
            info.add(explanation2);
            info.add(explanation3);
            info.add(explanation4);
        Box sourceBox = Box.createHorizontalBox();
            sourceBox.add(Source);
            sourceBox.add(source);
        Box outputBox = Box.createHorizontalBox();
            outputBox.add(Output);
            outputBox.add(output);
        Box textBoxes = Box.createVerticalBox();
            info.add(Box.createVerticalStrut(w/21));
            textBoxes.add(sourceBox);
            textBoxes.add(outputBox);
        Box buttons = Box.createHorizontalBox();
            buttons.add(replace);
            buttons.add(Box.createHorizontalStrut(w/50));
            buttons.add(cancel);
            buttons.add(Box.createVerticalStrut(w/30));
        JPanel upperPanel = new JPanel();
            upperPanel.add(info);
        JPanel middlePanel = new JPanel();
            middlePanel.add(textBoxes);
        JPanel lowerPanel = new JPanel();
            lowerPanel.add(buttons);
        BorderLayout border = new BorderLayout();
        JFrame frameWindow = new JFrame("Comment Replacer v1.0");
            frameWindow.add(upperPanel,BorderLayout.NORTH);
            frameWindow.add(middlePanel,BorderLayout.CENTER);
            frameWindow.add(lowerPanel,BorderLayout.SOUTH);
            frameWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frameWindow.setSize(w/2,h/2);
            frameWindow.setLocationRelativeTo(null);
            frameWindow.setVisible(true);   
        System.out.println("Done!");
    }
    public void replaceButtonClicked(){
        System.out.println("Replace button clicked!");
        // Do something else
    }
    public void cancelButtonClicked(){
        System.out.println(";-;");
        System.exit(0);
    }
}

Answer 1

目前的代码不起作用，方法必须是静态的

public static void replaceButtonClicked(){
    System.out.println("Replace button clicked!");
    // Do something else
}
public static void cancelButtonClicked(){
    System.out.println(";-;");
    System.exit(0);
}

通过这种方式，您发布的代码可以正常工作

Answer 2

static 有它的用途和地方，这可能不是其中之一。不要使用 public static void createInitialWindow(){，而是将其设为实例方法 public void createInitialWindow(){，然后在 main 方法中创建 class 的实例并调用该方法，例如…… .

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                ex.printStackTrace();
            }

            ReplaceComments replaceComments = new ReplaceComments();
            replaceComments.createInitialWindow()
        }
    });
}

public void createInitialWindow(){
    //...

这可能不仅可以解决这个问题，还可以解决您可能遇到的与之相关的许多其他问题

Answer 3

将 CustomActionListener 更改为 ActionListener

  /*       \/  This Part  \/       */

        JButton replace = new JButton("Replace");
            replace.setFont(new Font("Verdana", Font.PLAIN, w/80));
            replace.setSize(new Dimension(w/8,h/8));
            replace.addActionListener(new ActionListener(){  /*********************/
                public void actionPerformed(ActionEvent e){        /* Added this action */
                    replaceButtonClicked();                        /*  listener and it  */
                }                                                  /*   all broke :3    */
            });                                                    /*********************/
        JButton cancel = new JButton("Cancel");
            cancel.setFont(new Font("Verdana", Font.PLAIN, w/80));
            cancel.setSize(new Dimension(w/8,h/8));
            cancel.addActionListener(new ActionListener(){   /*********************/
                public void actionPerformed(ActionEvent e){        /* Added this action */
                    cancelButtonClicked();                         /*  listener and it  */
                }                                                  /*   all broke :3    */
            });                                                    /*********************/

        /*       /\  This Part  /\       */

并将方法更改为静态，:

        public static void replaceButtonClicked(){
        System.out.println("Replace button clicked!");
        // Do something else
    }
    public static void cancelButtonClicked(){
        System.out.println(";-;");
        System.exit(0);

}

JButton ActionListener (Java 8 JDK 1.8.0_74) 不工作

JButton ActionListener (Java 8 JDK 1.8.0_74) is not working

java

swing

awt

jbutton