如何使此GUI上的按钮工作？ [英] How do I make the buttons on this GUI work?

问题描述

我正在尝试创建一个GUI，当您单击一个按钮时会增加一个数字，当您单击另一个按钮时减少该数字。这是我的代码：

I'm trying to make a GUI that will increase a number when you click one button and decrease that number when you click another button. This is my code:

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


public class PushCounter
{
    static JTextField textArea;
	static int count = 0;
    
	public static void main(String[] args)
	{
		
		JFrame frame = new JFrame("PushCounter");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		JPanel panel = new JPanel();
		JButton upButton = new JButton("Up");
		JButton downButton = new JButton("Down");
		JTextField textArea = new JTextField(15);
		JLabel label = new JLabel("Count");
		
		
		upButton.addActionListener(new upButtonListener());
		downButton.addActionListener(new downButtonListener());
		
		panel.add(label);
		panel.add(textArea);
		panel.add(downButton);
		panel.add(upButton);
		
		
		frame.getContentPane().add(panel);
		frame.setVisible(true);
		frame.pack();
		
	}
	
	private static class upButtonListener implements ActionListener
	{
		
		public void actionPerformed(ActionEvent event)
		{
			++count;
			textArea.setText(Integer.toString(count));
		}
	}
	
	private static class downButtonListener implements ActionListener
	{
		
		public void actionPerformed(ActionEvent event)
		{
			--count;
			textArea.setText(Integer.toString(count));
		}
	}
	
}

它编译，但GUI本身没有不行。做错了吗？你会如何创造这样的东西以及为什么？



我尝试过：



我使内部类静态，以便修复无法对非静态字段进行静态引用错误。那就是让它编译。我现在不知道它有什么问题。

It compiles, but the GUI itself doesn't work. Do what's wrong with it? How would you create something like this and why?

What I have tried:

I made the inner classes static in order to fix a cannot make static reference to non-static field error. That was to make it compile. I have no idea what's wrong with it now.

推荐答案

Se 如何编写动作侦听器（Java™教程>使用JFC / Swing创建GUI>编写事件监听器） [ ^ ]。

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