So I am designing a JFrame using Eclipse WindowBuilder. This specific frame is an error message stating that the user provided invalid credentials. I have added a button to exit the frame and I now need to display the actual error message "The login credentials specified are invalid. Please provide valid credentials."
I have done some searching and everyone says to use a JLabel, but when I create my JLabel and enter the text to it, there is no wordwrap or anything so I can't fit the label inside my frame.
What is an easy way to simply display a message in the center of the JFrame?
This question is related to
java
swing
jframe
windowbuilder
The answer is
Instead of wasting your time to design a JFrame just to display a error message, you can use an JOptionPane which is by default modal:
import javax.swing.JOptionPane;
public class Main {
public static void main(String[] args) {
JOptionPane.showMessageDialog(null, "Your message goes here!","Message", JOptionPane.ERROR_MESSAGE);
}
}
P.S. Stop using Windowbuilder if you want to learn Swing.
when I create my JLabel and enter the text to it, there is no wordwrap or anything
HTML formatting can be used to cause word wrap in any Swing component that offers styled text. E.G. as demonstrated in this answer.
The easiest way to add a text to a JFrame:
JFrame window = new JFrame("JFrame with text");
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new BorderLayout());
window.add(new JLabel("Hello World"), BorderLayout.CENTER);
window.pack();
window.setVisible(true);
window.setLocationRelativeTo(null);
You can add a multi-line label with the following:
JLabel label = new JLabel("My label");
label.setText("<html>This is a<br>multline label!<br> Try it yourself!</html>");
From here, simply add the label to the frame using the add() method, and you're all set!
Source: Stackoverflow.com