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

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    Default 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?


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

    how to enter this in an if statement
    Are you asking how to compare the contents of a String variable to a String literal?
    aStrVar.equals("A literal")
    If you don't understand my answer, don't ignore it, ask a question.

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

    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?

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

    The text field has a method to get the data out of the textfield into a String.
    The String class has methods to test the contents of the String.
    If you don't understand my answer, don't ignore it, ask a question.

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

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

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

    First read the API doc for the text field class and find the method to get the text out of it.
    Then read the API doc for the String class and find a method that will find an occurrence of the specified substring.

    This task has nothing to do with JFrames or interfaces.
    If you don't understand my answer, don't ignore it, ask a question.

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