JAVA按钮点击之间所花费的时间

Question

我有一些代码显示两个按钮的 GUI，目标是按一个按钮两次以显示两次按钮单击之间所花费的时间(以毫秒为单位)。

虽然我的问题是时间总是0。有什么建议吗？我还想实现一种方法来获取单击按钮 a 和按钮 b 之间的时间。有小费吗？谢谢。

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

public class ButtonViewer 
{
    static int countA = 0;
    static int countB = 0;
public static void main( String[] args ) 
{
JFrame frame = new JFrame();
GridLayout layout = new GridLayout(2,2);
frame.setLayout(layout);
JButton buttonA = new JButton("Button A");
frame.add(buttonA);

class ClickListenerOne implements ActionListener 
{
    public void actionPerformed( ActionEvent event ) 
    {
        countA++;
        long StartA = System.currentTimeMillis();

        if (countA % 2 == 0)
        {
             long EndA = System.currentTimeMillis();
             long differenceA = (EndA - StartA);
             System.out.println(differenceA + " Elapsed");  
        }

    }
}

JButton buttonB = new JButton("Button B");
frame.add(buttonB);

class ClickListenerTwo implements ActionListener 
{
    public void actionPerformed( ActionEvent event ) 
    {
        countB++;
        long StartB = System.currentTimeMillis();
        if (countB % 2 == 0)
        {
             long EndB = System.currentTimeMillis();
             long differenceB = (EndB - StartB);
             System.out.println(differenceB + " Elapsed");  
        }
    }
}

ActionListener mButtonAClicked = new ClickListenerOne();
buttonA.addActionListener(mButtonAClicked);

ActionListener mButtonBClicked = new ClickListenerTwo();
buttonB.addActionListener(mButtonBClicked);

frame.setSize( 200, 200 );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setVisible(true);
}
}

Answer 1

设置按钮第一次点击时的StartA，即

 long StartA;
public void actionPerformed( ActionEvent event )
{
    countA++;
    if (countA % 2 != 0)
  StartA = System.currentTimeMillis();

    if (countA % 2 == 0)
    {
         long EndA = System.currentTimeMillis();
         long differenceA = (EndA - StartA);
         System.out.println(differenceA + " Elapsed");
    }

这将为您提供第一次点击和第二次点击之间的差异