是否可以让我的 JFrame 按钮不断打印输出

Question

程序应该做什么： 有一个 OK BUTTON：每 1000 毫秒输出一次用户时间 有一个 CLOSE 按钮：停止 OK BUTTON 并且没有输出

是否可以让我的按钮“确定”的动作侦听器在没有 while 循环的情况下继续运行？我正在努力做到这一点，这样你就可以点击一次，而其他所有按钮仍然可以在我的 JFrame 中工作。

我的意思是，每当您将 while 循环放在动作侦听器中时，它都会忽略对不同按钮的所有输入，除非我完全删除程序，否则我无法停止它。那么，是否可以让我的程序像一个while循环一样继续运行，但可以通过我在程序中制作的“关闭”按钮来停止？

package com.mc.main;
import java.time.format.DateTimeFormatter;  
import java.time.LocalDateTime;   
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GetTime {
    private JFrame frame;
    private JLabel headerLabel;
    private JLabel statusLabel;
    private JPanel controlPanel;
    static String usersTimeNow;
    public GetTime() {
        prepareGUI();
        
    }
       private void prepareGUI(){
              frame = new JFrame("Java Swing");
              frame.setSize(500,500);
              frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              frame.setLayout(new GridLayout(3, 1));
              frame.addWindowListener(new WindowAdapter() {
                 public void windowClosing(WindowEvent windowEvent){
                    System.exit(0);
                 }
              });
              headerLabel = new JLabel("", JLabel.CENTER);
              statusLabel = new JLabel("",JLabel.CENTER);
              statusLabel.setSize(350,100);
              controlPanel = new JPanel();
              controlPanel.setLayout(new FlowLayout());
              frame.add(headerLabel);
              frame.add(controlPanel);
              frame.add(statusLabel);
              frame.setVisible(true);
           }
           private void showButtonDemo(){
              boolean isStopped = false; 
              headerLabel.setText("Button Demo");
              JButton okButton = new JButton("OK");
              okButton.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent e) {
                    
                     getUsersTime();
                     sleepDelay();
                     
                 }
              });
              controlPanel.add(okButton);
              frame.setVisible(true);
              
              JButton closeButton = new JButton("CLOSE");
              closeButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    // TODO Auto-generated method stub
                    frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
                }
              });
              controlPanel.add(closeButton);
              frame.setVisible(true);
              
           }
    public void getUsersTime() {
           DateTimeFormatter dtf = DateTimeFormatter.ofPattern("HH:mm:ss");  
           LocalDateTime now = LocalDateTime.now();  
           System.out.println(dtf.format(now));  
           usersTimeNow = dtf.format(now);
           statusLabel.setText(usersTimeNow);

    }
    public void sleepDelay() {
        long start = System.currentTimeMillis();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        GetTime test = new GetTime();
        test.showButtonDemo();
        
        
    }
    
}

Answer 1

您应该尝试改用计时器。导入javax.swing.Timer；

Timer t = new Timer(1000, (ActionEvent e)->{
//here is where you would put what you want to happen every 1000 milliseconds


});

然后你可以制作一个按钮，按下时你会调用：

t.start();

对于关闭按钮：

t.stop();

Answer 2

你的完整代码是

package com.mc.main;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
public class GetTime {
    private JFrame frame;
    private JLabel headerLabel;
    private JLabel statusLabel;
    private JPanel controlPanel;
    static String usersTimeNow;
    public LocalDateTime now;
    public static Timer t;
    public GetTime() {
        prepareGUI();
        
    }
       private void prepareGUI(){
              frame = new JFrame("Java Swing");
         t = new Timer(1000,(ActionEvent e)-> {
             DateTimeFormatter dtf = DateTimeFormatter.ofPattern("HH:mm:ss");  
             now = LocalDateTime.now();
             System.out.println(dtf.format(now));  
             usersTimeNow = dtf.format(now);
           
             statusLabel.setText(usersTimeNow);
                
            });
              frame.setSize(500,500);
              frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              frame.setLayout(new GridLayout(3, 1));
              frame.addWindowListener(new WindowAdapter() {
                 public void windowClosing(WindowEvent windowEvent){
                    System.exit(0);
                 }
              });
              headerLabel = new JLabel("", JLabel.CENTER);
              statusLabel = new JLabel("",JLabel.CENTER);
              statusLabel.setSize(350,100);
              controlPanel = new JPanel();
              controlPanel.setLayout(new FlowLayout());
              frame.add(headerLabel);
              frame.add(controlPanel);
              frame.add(statusLabel);
              frame.setVisible(true);
           }
           private void showButtonDemo(){
              boolean isStopped = false; 
              headerLabel.setText("Button Demo");
              JButton okButton = new JButton("OK");
              okButton.addActionListener(new ActionListener() {
                 public void actionPerformed(ActionEvent e) {
                    
                     getUsersTime();
                     sleepDelay();
                     
                 }
              });
              controlPanel.add(okButton);
              frame.setVisible(true);
              
              JButton closeButton = new JButton("CLOSE");
              closeButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    // TODO Auto-generated method stub
                   t.stop();
                    // frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
                }
              });
              controlPanel.add(closeButton);
              frame.setVisible(true);
              
           }
    public void getUsersTime() {
        t.start();  
        
           
    }
    public void sleepDelay() {
        long start = System.currentTimeMillis();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        GetTime test = new GetTime();
        test.showButtonDemo();
        
        
    }
    
}