JPanel vs JFrame in Java

Question

I am learning Java gui  The way I learnt to create a window is to inherit or Extend JFrame class and it is good to use it  as JFrame contains all the properties of a Window  Now If I want to add something to this window  I need to use add   method  But Today I came across JPanel which also creates a windows and we can add stuff by jpanelObjec add      What is the difference between the two methods  Are they somehow related

User · Answer

JFrame is the window  it can have one or more JPanel instances inside it   JPanel is not the window   You need a Swing tutorial   http   docs oracle com javase tutorial uiswing

User · Answer

You should not extend the JFrame class unnecessarily  only if you are adding extra functionality to the JFrame class   JFrame   JFrame extends Component and Container   It is a top level container used to represent the minimum requirements for a window  This includes Borders  resizability  is the JFrame resizeable    title bar  controls  minimize maximize allowed    and event handlers for various Events like windowClose  windowOpened etc   JPanel   JPanel extends Component  Container and JComponent  It is a generic class used to group other Components together     It is useful when working with LayoutManagers e g  GridLayout f i adding components to different JPanels which will then be added to the JFrame to create the gui  It will be more manageable in terms of Layout and re-usability    It is also useful for when painting drawing in Swing  you would override paintComponent     and of course have the full joys of double buffering    A Swing GUI cannot exist without a top level container like  JWindow  Window  JFrame Frame or Applet   while it may exist without JPanels

[java] JPanel vs JFrame in Java

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