如何使用Swing创建简单的Java表单？

Question

I'm very new to swing and have trouble dealing with JFrame s so I thought you guys could help.

I'm trying to make a simple window show up with 3 text fields and a check box. At the bottom there should be a "done" button which closes the form.

I can make the JFrame with the JTextField s and JCheckBox but how do I retrieve the input?

Thanks in advance

Answer 1

As stated in the Swing tutorial , you can add an ActionListener to the JButton , which will be called when the button has been pressed.

To retrieve the text from the JTextField , use the JTextField#getText() method

To determine whether the JCheckBox is actually selected, use the JCheckBox#isSelected() method

But a good starting point is reading the Swing tutorial from the start

Answer 2

It would be helpful if you would post some code showing how you show your JFrame , then I could give you a more specific example.

In general, you'll have a class that extends JFrame , JDialog , etc. In that class you'll have getters and setters that will get and set the values of the controls on the form.

In your case, once "Done" is clicked you could have a listener, either on the "Done" button or on the frame itself (listening for the closing event) retrieve the values from your form and do something with them.

If this isn't clear please post some code and perhaps I can give you a concrete example.

Answer 3

public class MyFrame extends JFrame {

    private JTextField textField = new JTextField();
    private JButton doneBtn = new JButton("Done");

    // rest of your form
}

If you want to get the contents of textField when the doneBtn is pressed, you need to attach an event listener to the button:

public class MyFrame extends JFrame {

    private JTextField textField = new JTextField();
    private JButton doneBtn = new JButton("Done");

    public MyFrame() {
        // Here we attach an event listener to the button.
        // Whenever you press the button, the code inside actionPerformed will be executed
        doneBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                System.out.println(textField.getText()); // Or do whatever you like
            }
        });
    }

    // rest of your form
}

But, honestly, you should learn this yourself. If you haven't read a tutorial about check boxes, of course you won't know how they work. Read first, and if you had a question, then ask for help. You haven't read enough and yet you are asking questions.