Thread: Help with NetBeans App using JPanel/JFrame with JButton (if statements)

Can anyone help me with a minor bump? I'm using NetBeans and I'm doing an assignment in a JPanel/JFrame application. I need to know how to make a letter necessary for a log in page.
For example: to enter the page, you've to enter your I.D number; x12345678.
I'd like to know how to enter this in an if statement

Here's a line of code from a button action when clicked to show an error message:

private void submitBtnClicked(java.awt.event.ActionEvent evt) {                                  
       if(nameTf.getText().length() == 0){
            JOptionPane.showMessageDialog(null, "Invalid Name");
        }
 
        if(studentTf.getText().length() == 0){
            JOptionPane.showMessageDialog(null, "Invalid Student Number");
        }
    }

Can anyone help me, please?

I have a JTextField called studentTf();
What I am looking for is an if statement to make the letter 'x' necessary inside that JTextField


Also, how would I make a JButton submit all of the content of that and open up a new JPanel page, showing the name and number of the student?

Could you show me an example? I've only started doing JFrames and Interfaces in college, and I'm a n00b at it haha