Slider in Swing is similar to scroll bar which allows the user to select a numeric value from a specified range of integer values.
Focus Listener is the interface which is used to receive the keyboard focus event.focusGained(gains the keyboard focus) and focusLost(loses the keyboard focus) are the two methods.
GridBag Layout is complex when compared to the other layouts provided in the AWT. GridBag Layout allows the user to organize components in multiple rows and columns, stretch specific rows and columns when space is available, and anchor objects in different corners.
BoxLayout organizes components horizontally or vertically(rows or a column) means components are placed top-to-bottom or left-to-right in the order in which they are added to the container.