An alternative to pack is to establish a frame size explicitly by calling setSize or setBounds (which also sets the frame location). The pack method sizes the frame so that all its contents are at or above their preferred sizes.If you're not already familiar with content panes and how to add components to them, please read Adding Components to the Content Pane.įor frames that have menus, you'd typically add the menu bar to the frame here using the setJMenuBar method. The next bit of code adds a blank label to the frame content pane.See Responding to Window-Closing Events for more information. This behavior is appropriate for this program because the program has only one frame, and closing the frame makes the program useless. The EXIT_ON_CLOSE operation exits the program when your user closes the frame. Next the code specifies what happens when your user closes the frame.The other frequently used JFrame constructor is the no-argument constructor. The first line of code creates a frame using a constructor that lets you set the frame title.Create components and put them in the frame.įrame.getContentPane().add(emptyLabel, BorderLayout.CENTER) Optional: What happens when the frame closes?įtDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
The following FrameDemo code shows how to create and set up a frame. Here is a picture of the extremely plain window created by the FrameDemo demonstration application. To make a window that appears within another window, use an internal frame. To make a window that is dependent on another window disappearing when the other window is iconified, for example use a dialog instead of frame. Applications with a GUI usually include at least one frame. JFrame class, is a window that has decorations such as a border, a title, and supports button components that close or iconify the window. Since the border area is included in the overall size of the frame, the border effectively obscures a portion of the frame, constraining the area available for rendering and/or displaying subcomponents to the rectangle which has an upper-left corner location of (insets.left, insets.top), and has a size of width - (insets.left + insets.right) by height - (insets.top + insets.bottom).Ī frame, implemented as an instance of the The dimensions of the border area may be obtained using the getInsets method. The size of the frame includes any area designated for the border. A Frame is a top-level window with a title and a border.
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