![]() By setting a container's layout property to null, you make the container use no layout manager. ![]() For example:Ĭontainer contentPane = frame.getContentPane() Īlthough we strongly recommend that you use layout managers, you can perform layout without them. You can set a panel's layout manager using the JPanel constructor. Again, you should use an appropriate tool to do this, rather than coding the manager by hand. Any real application will need to reset the layout manager. However, unless you are using JToolBar, the FlowLayout and BorderLayout managers are only useful for prototyping. If you do not like the default layout manager that a panel or content pane uses, you are free to change it to a different one. Content panes use BorderLayout by default. Each JPanel object is initialized to use a FlowLayout, unless you specify differently when creating the JPanel. This section discusses some of the common tasks related to using layout managers:Īs a rule, the only containers whose layout managers you need to worry about areĬontent panes. If you are interested in using JavaFX to create your GUI, see Otherwise, if you want to code by hand and do not want to use GroupLayout, then GridBagLayout is recommended as the next most flexible and powerful layout manager. If you are not interested in learning all the details of layout management, you might prefer to use the GroupLayout layout manager combined with a builder tool to lay out your GUI. ![]() Uses a panel with a right-aligned FlowLayout presenting two buttons.Note: This lesson covers writing layout code by hand, which can be challenging. How to Use Buttons, Check Boxes, and Radio Buttons If you set the RIGHT_TO_LEFT constant to true and recompile, you can see how FlowLayout handles a container that has a right-to-left component orientation.Ĭenters a component nicely in the top part of a BorderLayout, and puts the component in a JPanel that uses a FlowLayout. Sets up a content pane to use FlowLayout. The following table lists code examples that use the FlowLayout class and provides links to related sections. The hgap and vgap arguments specify the number of pixels to put between components. When the FlowLayout object controls a container with a left-to right component orientation (the default), the LEADING value specifies the components to be left-aligned and the TRAILING value specifies the components to be right-aligned.įlowLayout (int align, int hgap, int vgap)Ĭreates a new flow layout manager with the indicated alignment and the indicated horizontal and vertical gaps. The alignment argument can be FlowLayout.LEADING, FlowLayout.CENTER, or FlowLayout.TRAILING. ConstructorĬonstructs a new FlowLayout object with a centered alignment and horizontal and vertical gaps with the default size of 5 pixels.Ĭreates a new flow layout manager with the indicated alignment and horizontal and vertical gaps with the default size of 5 pixels. The following table lists constructors of the FlowLayout class. The code snippet below creates a FlowLayout object and the components it manages.ĬtComponentOrientation( Another constructor of the FlowLayout class specifies how much vertical or horizontal padding is put around the components. To specify that the row is to aligned either to the left or right, use a FlowLayout constructor that takes an alignment argument. If the container is wider than necessary for a row of components, the row is, by default, centered horizontally within the container. If the horizontal space in the container is too small to put all the components in one row, the FlowLayout class uses multiple rows. The FlowLayout class puts components in a row, sized at their preferred size. Alternatively, to compile and run the example yourself, consult the example index. Java™ Web Start ( download JDK 7 or later). The following figure represents a snapshot of an application that uses the flow layout:Ĭlick the Launch button to run FlowLayoutDemo using If you are interested in using JavaFX to create your GUI, seeįlowLayout class provides a very simple layout manager that is used, by default, by the JPanel objects. Note: This lesson covers writing layout code by hand, which can be challenging.
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