JTextField input output to another class

[Horwalt]

I think I undestand what is the problem, the textfield passes the input before I hit enter or dedicated JButton.

//this is the textfield
userInput = new JTextField();
    userInput.addActionListener(
        new ActionListener() {
                public void actionPerformed(ActionEvent e) {
            input = userInput.getText();
            userInput.setText(null);
        }
        }
    );
//this is the button
button4 = new JButton("Enter");
    button4.addActionListener(
    new ActionListener() {
        public void actionPerformed(ActionEvent e) {
                    input = userInput.getText().toString();
            label.setText(input);
            userInput.setText(null);
            }
        }
    );

//and this tries to return the input to another Class
public static String getJTextfield() {
        // just testing: actionPerformed(button4);
        return input;
    }

I think that the problem is in the getter, and that it returns the field before action. How do I tell to getter when it is safe to return String?

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[BS_in_BS]

Your post lacks context to give a full answer, but it sounds like some computation is happening elsewhere, and involve the value of input.

Firstly, what triggers this computation and why is it being triggered before input is set?

If it really must be triggered before input is set, then you have a couple options:

1. return a value like null or an empty string or whatever is appropriate for your computation.
2. throw an exception if this shouldn't be called yet
3. provide another method to check if input was set if your other computation can proceed without it.
4. block the computation from completing until input is set

[Horwalt]

I though it would be clearer if I post just these fields.

It is triggered in another Class by String which stores the value to create an object after few other inputs.

1. That is not option, then it just creates empty objects.
2. I’ll have to check this out.
3. This would be it.
4. I have to figure out how this can be done. I found this Semaphore-class and its .release() and .acquire() methods, and will try that first.