如果用户单击 Jbutton,我怎样才能增加分数?

How can I get a score to increase if the user clicked a Jbutton?

如果用户单击一个 Jbutton(所有按钮),我怎样才能增加分数,如果他单击框架中的随机位置,我怎么能减少分数?这是代码

package projet;
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
public class Letstry { 
    static int score; 
    public static void main (String[] args){ 
        JFrame frame = new JFrame("Scity4"); 
        frame.setVisible(true); 
        frame.setSize(500,200); 
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        JLabel lblNewLabel = new JLabel("score : "); 
        lblNewLabel.setBounds(72, 131, 46, 14); 
        frame.add(lblNewLabel); 
        lblNewLabel.setText(String.valueOf(score)); 
        JPanel panel = new JPanel(); 
        frame.add(panel); 
        JButton button = new JButton("Score inc"); 
        panel.add(button); 
        button.addActionListener (new ActionListener() { 
            public void actionPerformed(ActionEvent e) { 
                score = score +10; 
                JLabel lblNewLabel = new JLabel("score : "); 
                lblNewLabel.setBounds(72, 131, 46, 14); 
                frame.add(lblNewLabel); 
                lblNewLabel.setText(String.valueOf(score));
            } 
        }); 
    } 
}

好的,每次用户单击 +10 按钮时,这段代码都会增加 +10

要使其与 -10 一起使用,或者如果他们单击框架您想要减少的任何数字,您应该选中 JFrame mouse click using JComponent and MouseListener

正如我所说,下次让您的代码可读时不要使用此标记 (``) 来显示代码,而是使用 4 个空格或单击上面的 { } 按钮。

不要使用 null 布局,而是使用 @BillK 的 Layout Manager. For more information about this, read this question and the answer

希望对您有所帮助,欢迎来到 Whosebug。

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener;
import java.awt.FlowLayout;
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
public class Letstry { 
    static int score;
    static JFrame frame;
    static JLabel label;
    static JButton button;
    public static void main (String[] args){
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    } 
    public static void createAndShowGUI() {
        frame = new JFrame("Scity4"); 
        frame.getContentPane().setLayout(new FlowLayout());
        label = new JLabel("Score: ");
        button = new JButton("+10");
        button.addActionListener (new ActionListener() { 
            public void actionPerformed(ActionEvent e) { 
                score = score + 10;
                label.setText("Score: " + score);
                frame.pack();
            } 
        });
        frame.add(label);
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    }
}