Question

This method shows a new window in my application:

public void ShowNewCustomerView() {
    if (NewCustomer == null) NewCustomer = new NewCustomerView(this);
    NewCustomer.setVisible(true);
}

The class NewCustomerView has this method:

public void ClearFields() {
    txtAddress.setText("");
    txtCity.setText("");
    txtCompanyName.setText("");
    txtCustomerNumber.setText("");
    txtOrganisationNumber.setText("");
    txtPhoneNumber1.setText("");
    txtPhoneNumber2.setText("");
    txtPostalCode.setText("");
    txtReferenceName.setText("");
}

How can I run that method before the line:

NewCustomer.setVisible(true);

Adding this:

NewCustomer.ClearFields();

…does not work… why is that?

This is what error I get:
Cannot find symbol (method ClearFields())
Class: javax.Swing.JFrame

But I created a new instance of NewCustomerView which extends JFrame?? Right?

Answer 1

From your comments I think you declare NewCustomer like this:

JFrame NewCustomer; 

If so try declaring:

NewCustomerView NewCustomer;

or

public void ShowNewCustomerView() {
    if (NewCustomer == null) NewCustomer = new NewCustomerView(this);
    ((NewCustomerView)NewCustomer).ClearFields();
    NewCustomer.setVisible(true);
}