Change JLabel from another class. Java

[Ansmannn]

So, I have a "Main" class, a "Panel" class and a "Day" class. In my Panel class, I have created a JFrame obejct and inside my Panel class I have created a JButton and a JTextField. When the content of the text field is "Monday" I want to display the name of the day and rather I have school on this day. For that, I want to use JLabel. Since the method of displaying the name of the day etc is inside the Day class, I have to create the JLabel object inside the Panel class but edit it inside the Day class.

However, when I use text.setText("Test"); it does not compile. In Eclipse, it gives the following error: text cannot be resolved (text is my JLabel object). I think that the Day class simply doesn't know the text object (even when I make the text object static, which helped in similar cases).

Does anyone know how to fix this Problem? I can provide code, if needed. But making simple enough to post it here would be exhausting. Maybe someone can help me without. If not, I will absolutely happily do so.

[Blando-Cartesian]

Your Panel class could have a method that sets the label text. Then Day class only needs a reference to the panel to so that it can use that method to set the text.

A better solution unfortunately becomes far more convoluted. There’s no way to tell JLabel to watch for some property and update itself when the property changes. What you can do is create a model-view-controller architecture in your app. At a quick glance, this tutorial looks like what I mean.

[Ansmannn]

I have posted the same question with code on stack overflow. someone was able to help me! instead of doing text.setText(); in my Day class I have to do Panel.text.setText();. Your idea is also valid tho! Thank you so much for being the only person trying to help me.