Why Do We Need a Top Level Container Like JFrame?

Top-level containers like JFrame are needed in Java GUI programming. These containers provide a way to display a Graphical User Interface (GUI) on the computer screen. A top-level container is a container that can be displayed on its own. Without being contained in another container.

JFrame is a top-level container that provides a number of useful features for creating GUIs. Some of them are given below:

  • JMenuBar
  • A close button
  • A minimize button
  • A maximize button

JFrame also provides different methods that allow us to control the appearance and behavior of the GUI. The most useful methods are given below:

  • setTitle()
  • setSize()
  • setVisible()
  • setDefaultCloseOperation()

In addition to JFrame, there are other top-level containers in Java like JDialog and JWindow.

JDialog is a top-level container that is used to display a modal dialog box, which is a dialog box that prevents the user from interacting with the rest of the GUI until the dialog box is closed.

JWindow is a top-level container that we can use to display a non-modal dialog box. this is a dialog box that allows the user to interact with the rest of the GUI while the dialog box is open.

Top-level containers are an essential part of Java GUI programming. They provide a number of features that make it easy to create and manage GUIs.