The Math class provides the random method. The random method generates a double value greater tha or equal to 0.0 but less than 1.0.
Menus are an integral part of GUI(Graphical User Interface). Menus allow the user to perform actions with extra GUI components. In Swing GUIs, menus can only be attached to objects of the classes that provide method setJMenuBar.
A Table is used to display data in the form of rows and columns. It can allow editing of data which is optional. By default, the columns of a table can be resized.
In JCombobox the selected text is displayed in the text field.The Swing JCombo will automatically add scroll bar. combo_b.removeItemAt(0) is used to remove elements (specified item) from the list.