小编Daf*_*unk的帖子

我希望菜单栏上的菜单可以在鼠标上更改其背景颜色..就像在大多数应用程序中一样.
我想要这个效果 - > 示例图片
到目前为止我尝试过的...

public class Menu extends JMenuBar implements ActionListener {

private JMenuItem fileItem_close;
private final MouseListener mouseAction = new MouseAdapter() { //i use this to apply the mouse event
    @Override
    public void mouseEntered(MouseEvent e) {
        JMenu item = (JMenu)e.getSource(); //is this implementation correct ?
        item.setOpaque(true);
    };

    @Override
    public void mouseExited(MouseEvent e) {
        JMenu item = (JMenu)e.getSource(); 
        item.setOpaque(false);
    };
};


public Menu() {
    initFileMenu();
}

private void initFileMenu() {
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic('F');
    fileMenu.setRolloverEnabled(true);

    fileItem_close …

嗨,我试图通过谷歌SMTP发送一封电子邮件,
我认为代码是正确的,但我得到以下异常..

"G:\Installed Applications\Python\Python35-32\python.exe" "C:/Users/brand/Desktop/Test Projects/Python Projects/SMTP.py"
Traceback (most recent call last):
  File "C:/Users/brand/Desktop/Test Projects/Python Projects/SMTP.py", line 22, in <module>
    server.login(sender, password)
  File "G:\Installed Applications\Python\Python35-32\lib\smtplib.py", line 730, in login
    raise last_exception
  File "G:\Installed Applications\Python\Python35-32\lib\smtplib.py", line 721, in login
    initial_response_ok=initial_response_ok)
  File "G:\Installed Applications\Python\Python35-32\lib\smtplib.py", line 627, in auth
    initial_response = (authobject() if initial_response_ok else None)
  File "G:\Installed Applications\Python\Python35-32\lib\smtplib.py", line 664, in auth_login
    raise SMTPAuthenticationError(code, resp)
smtplib.SMTPAuthenticationError: (502, b'5.5.1 Unrecognized command. m16sm36193099wmb.13 - gsmtp')

Process finished with exit code 1

我的代码显示在这里:

import smtplib …