深入了解 GUI 并尝试让事情变得简单。然而,我似乎只做一个简单的“退出”按钮。我正在使用 Eclipse 的 WindowsBuilder 插件来帮助我。
private void initialize()
{
mainWindowFrame = new JFrame();
mainWindowFrame.setTitle("Lock and Log");
mainWindowFrame.setIconImage(Toolkit.getDefaultToolkit().getImage(MainWindow.class.getResource("/lockandlog/main/resources/icon.png")));
mainWindowFrame.setResizable(false);
mainWindowFrame.setBounds(100, 100, 854, 480);
mainWindowFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainWindowFrame.getContentPane().setLayout(null);
final JTextArea logDisplay = new JTextArea();
logDisplay.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
logDisplay.setEditable(false);
logDisplay.setBounds(259, 11, 579, 250);
mainWindowFrame.getContentPane().add(logDisplay);
JLabel viewCmdDisplayLbl = new JLabel("View Command Display:");
viewCmdDisplayLbl.setFont(new Font("Tahoma", Font.BOLD, 11));
viewCmdDisplayLbl.setBounds(259, 272, 133, 14);
mainWindowFrame.getContentPane().add(viewCmdDisplayLbl);
JTextArea textArea = new JTextArea();
textArea.setEditable(false);
textArea.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
textArea.setBounds(259, 297, 579, 104);
mainWindowFrame.getContentPane().add(textArea);
JToolBar toolBar = new JToolBar();
toolBar.setBounds(0, 412, 848, 16);
mainWindowFrame.getContentPane().add(toolBar);
JPanel manualGrp = new JPanel();
manualGrp.setBorder(new TitledBorder(null, "", TitledBorder.LEADING, TitledBorder.TOP, null, null));
manualGrp.setBounds(10, 11, 239, 72);
mainWindowFrame.getContentPane().add(manualGrp);
manualGrp.setLayout(null);
manualTxt = new JTextField();
manualTxt.setBounds(10, 7, 219, 20);
manualGrp.add(manualTxt);
manualTxt.setColumns(10);
JButton manualBtn = new JButton("Manual Override");
manualBtn.setFont(new Font("Tahoma", Font.BOLD, 12));
manualBtn.setBounds(10, 38, 219, 23);
manualGrp.add(manualBtn);
JMenuBar menuBar = new JMenuBar();
mainWindowFrame.setJMenuBar(menuBar);
final JMenu fileBtn = new JMenu("File");
fileBtn.addMouseListener(new MouseAdapter() //This works
{
@Override
public void mouseEntered(MouseEvent e)
{
fileBtn.setSelected(true);
}
@Override
public void mouseExited(MouseEvent e)
{
fileBtn.setSelected(false);
}
});
menuBar.add(fileBtn);
JMenuItem exitBtn = new JMenuItem("Exit");
//Code is definitely passing through here.
exitBtn.addMouseListener(new MouseAdapter() //This doesn't work?
{
@Override
public void mouseClicked(MouseEvent e)
{
logDisplay.setText("Test"); //This isn't even being called!
System.exit(0);
}
});
//Definitely adds the button so code is passing through here.
fileBtn.add(exitBtn);
}
这就是现在的整个初始化类。但是,如果您注意到在底部附近,我有一个“退出”按钮的事件,如果您单击它,程序应该关闭。除了,当我点击按钮时什么也没有发生。尝试其他类似 fileBtn 中的事件,效果很好。那么我做错了什么?
最佳答案
不要使用 mouseListener,使用 ActionListener。
import java.awt.event.*;
public class SOQ3
{
JFrame mainWindowFrame;
public static void main(String[] args)
{
SOQ3 s = new SOQ3();
}
public SOQ3()
{
initialize();
}
private void initialize()
{
mainWindowFrame = new JFrame();
mainWindowFrame.setTitle("Lock and Log");
mainWindowFrame.setIconImage(Toolkit.getDefaultToolkit().getImage(MainWindow.class.getResource("/lockandlog/main/resources/icon.png")));
mainWindowFrame.setResizable(false);
mainWindowFrame.setBounds(100, 100, 854, 480);
mainWindowFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainWindowFrame.getContentPane().setLayout(null);
final JTextArea logDisplay = new JTextArea();
logDisplay.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
logDisplay.setEditable(false);
logDisplay.setBounds(259, 11, 579, 250);
mainWindowFrame.getContentPane().add(logDisplay);
JLabel viewCmdDisplayLbl = new JLabel("View Command Display:");
viewCmdDisplayLbl.setFont(new Font("Tahoma", Font.BOLD, 11));
viewCmdDisplayLbl.setBounds(259, 272, 133, 14);
mainWindowFrame.getContentPane().add(viewCmdDisplayLbl);
JTextArea textArea = new JTextArea();
textArea.setEditable(false);
textArea.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
textArea.setBounds(259, 297, 579, 104);
mainWindowFrame.getContentPane().add(textArea);
JToolBar toolBar = new JToolBar();
toolBar.setBounds(0, 412, 848, 16);
mainWindowFrame.getContentPane().add(toolBar);
JPanel manualGrp = new JPanel();
manualGrp.setBorder(new TitledBorder(null, "", TitledBorder.LEADING, TitledBorder.TOP, null, null));
manualGrp.setBounds(10, 11, 239, 72);
mainWindowFrame.getContentPane().add(manualGrp);
manualGrp.setLayout(null);
manualTxt = new JTextField();
manualTxt.setBounds(10, 7, 219, 20);
manualGrp.add(manualTxt);
manualTxt.setColumns(10);
JButton manualBtn = new JButton("Manual Override");
manualBtn.setFont(new Font("Tahoma", Font.BOLD, 12));
manualBtn.setBounds(10, 38, 219, 23);
manualGrp.add(manualBtn);
JMenuBar menuBar = new JMenuBar();
mainWindowFrame.setJMenuBar(menuBar);
final JMenu fileBtn = new JMenu("File");
fileBtn.addMouseListener(
new MouseAdapter() //This works
{
@Override
public void mouseEntered(MouseEvent e)
{
fileBtn.setSelected(true);
}
@Override
public void mouseExited(MouseEvent e)
{
fileBtn.setSelected(false);
}
});
menuBar.add(fileBtn);
JMenuItem exitBtn = new JMenuItem("Exit");
//Code is definitely passing through here.
exitBtn.addActionListener(
new ActionListener() //This doesn't work?
{
@Override
public void actionPerformed(ActionEvent e)
{
logDisplay.setText("Test"); //This isn't even being called!
System.exit(0);
}
});
//Definitely adds the button so code is passing through here.
fileBtn.add(exitBtn);
}
}
现在至于这背后的原因,您正在尝试使用 MouseListeners,虽然 MouseListeners 很好,但您需要获取您正在收听的内容的来源。现在,只需添加一个监听器就可以执行与 ActionListener 相同的操作,这也是我选择使用监听器的部分原因。另外,给你一个提示,使用 ActionListeners 监听它所附加的对象完成的操作,MouseListeners 监听你的 Action 以及它所做的一切,无论它是否与你的程序有任何关系。将来,在使用监听器时,请确保它们只监听程序绝对必需的内容。如果您不需要知道鼠标的位置,请不要跟随它。
关于java - 退出按钮不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26205628/