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public class Box extends JComponent implements Accessible
Use the BoxLayout object as a lightweight container for its layout manager.
Box provides several class methods useful for containers using BoxLayout (even non-Box containers).
The Box class can create several invisible components that affect layout: glue, struts and rigid areas. If all components contained by the Box have a fixed size, you can use the glue component (returned by createGlue) to control the position of the components. If you want to have a fixed amount of space between two components, try using strut (createHorizontalStrut or createVerticalStrut). If you need an invisible component that always takes up the same amount of space, you can get it by calling createRigidArea.
If you want to learn JAVA well, you must do more exercises while firmly grasping the basics.
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