How to check if JPassword field is null

Question

I want to check the username and password in Swing. The check works for username, but it doesn't work for JPaswordfield. I am posting the related code: ``` //Here I get the password Char[] pwd = jt1.getPassword(); String s = new String(pwd); //converting char to string String p = s; //In the JButton checking username and password(Username check works fine but not passwordfield) jb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if ((jt.getText().length()) == 0) { JFrame jf1 = new JFrame("UserName"); jf1.setSize(401, 401); //jf1.setVisible(true); jf1.setDefaultCloseOperation(jf1.EXIT_ON_CLOSE); JOptionPane.showMessageDialog(jf1, "User Name is empty"); } else if((p.length()) == 0) { JFrame jf1 = new JFrame("Password"); jf1.setSize(401, 401); //jf1.setVisible(true); jf1.setDefaultCloseOperation(jf1.EXIT_ON_CLOSE); JOptionPane.showMessageDialog(jf1, "Password is empty"); } else if ((p.length() == 0) && (jt.getText().length()) == 0) { JFrame jf1 = new…

Accepted Answer

Very simple get the text using `JPasswordField#getPassword()` which returns a `char[]` of the text, then simply get the length of the array and check if it is equal to 0:

```
JPasswordField jpf...

if(jpf.getPassword().length == 0) {
    // it is empty
}else {
   // it is not empty
}
```

How to check if JPassword field is null

Solution

Problem