不是重复的问题……但我的回答应该对您的问题有所帮助。
简短的总结,我的偏好是让 JFrame 类不实现 ActionListener,然后让一些命名的内部类与 JFrame 一起实现 ActionListener。
我会把 main 放在一个单独的类中......并称它为 Main。
这是我喜欢这样做的一些示例代码:
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class Main
{
private Main()
{
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
final FooFrame frame;
frame = new FooFrame();
frame.setupGUI();
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
然后是图形用户界面:
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class FooFrame
extends JFrame
{
private final JButton incrementBtn;
private final JButton decrementBtn;
private int value;
{
incrementBtn = new JButton("++");
decrementBtn = new JButton("--");
}
private class IncrementListener
implements ActionListener
{
public void actionPerformed(final ActionEvent evt)
{
increment();
}
}
private class DecrementListener
implements ActionListener
{
public void actionPerformed(final ActionEvent evt)
{
decrement();
}
}
public void setupGUI()
{
final LayoutManager layout;
layout = new FlowLayout();
setLayout(layout);
setupListeners();
addComponents();
}
private void setupListeners()
{
incrementBtn.addActionListener(new IncrementListener());
decrementBtn.addActionListener(new DecrementListener());
}
private void addComponents()
{
add(incrementBtn);
add(decrementBtn);
}
private void increment()
{
value++;
System.out.println("value = " + value);
}
private void decrement()
{
value--;
System.out.println("value = " + value);
}
}