按下10次时如何禁用jbutton

Question

我需要一些关于 Java GUI 的帮助。我想从 JTextField 向内存中添加 10 个数字。当它完成时，JButton 必须被禁用并且程序必须向我显示一个消息对话框。我怎样才能做到这一点？

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Uygulama extends JFrame {
    private JPanel contentPane;
    private JTextField textField;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Uygulama frame = new Uygulama();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
    public Uygulama() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 233, 140);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        textField = new JTextField();
        textField.setBounds(48, 13, 116, 22);
        contentPane.add(textField);
        textField.setColumns(10);
        JButton btnHesapla = new JButton("HESAPLA");
        btnHesapla.addActionListener(new ActionListener() {int counter = 0; 
        public void actionPerformed(ActionEvent arg0) {
            while(counter < 9) {
                counter++;
                if(counter == 10) {
                    buton.setEnabled(false);}
            }
        });
        btnHesapla.setBounds(58, 48, 97, 25);
        contentPane.add(btnHesapla);
    }
}

Answer 1

如果使用 Swing，则将 ActionListener 添加到您的 JButton，在其中，您将增加一个全局变量。然后您询问变量是否为== 10，如果您不使用if，则执行yourButton.setEnabled(false) 或yourButton.setEnabled(counter < 10)。您已经设置了侦听器，因此只需添加一个您将在其中递增的变量并调用按钮的 setEnabled。

这是一个工作示例，其中 ArrayList 用于存储数字。这里不需要使用全局计数变量，因为ArrayList 的大小已经告诉我们我们存储了多少数字:-)

public class NumbersApplication extends JFrame {

    private JPanel contentPane;
    private JTextField textField;
    private List<Integer> numbers;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    NumbersApplication frame = new NumbersApplication();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public NumbersApplication() {
        numbers = new ArrayList<>();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 233, 140);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        textField = new JTextField();
        textField.setBounds(48, 13, 116, 22);
        contentPane.add(textField);
        textField.setColumns(10);
        JButton btnHesapla = new JButton("HESAPLA");
        btnHesapla.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int number = Integer.parseInt(textField.getText());
                numbers.add(number);
                btnHesapla.setEnabled(numbers.size() < 10);
                System.out.println(number + " has been added to memory.");
                if (numbers.size() == 10) {
                    System.out.println("Your numbers are: " + numbers);
                }
            }
        });
        btnHesapla.setBounds(58, 48, 97, 25);
        contentPane.add(btnHesapla);
    }
}