How to Set JPanel s Width and Height

Question

I m developing Snake game using Java  Board s  where all action takes it place  width and height should be fixed  640 pixels   480 pixels    Structure    Main class that extends from JFrame class  Board class that extends from JPanel class    In Main class I have something like     setSize  1024  768         and in Board class I have     setSize  BOARDS WIDTH  BOARDS HEIGHT      Problem is that main and only windows seems to be like 1024   768  but panel inside it - not like 640   480  I have setBackground   as well and background is filled more than 640   480   Is there any way to make Board s width and height like 640   480  but main windows width and height - as much as Board s width and height are correct   Right now it looks like this       Edit   All works    almost   Main class   add  new Board    BorderLayout CENTER    pack    setResizable  false    setLocationRelativeTo  null    setVisible  true    setDefaultCloseOperation  EXIT ON CLOSE    setTitle   Snake  by daGrevis        Board class   setPreferredSize  new Dimension  640  480        Gray background is 642   482  Like there would be border that wraps all by 1 pixel

User · Answer

Board setPreferredSize new Dimension x  y          Main add Board  BorderLayout CENTER   Main add Board  BorderLayout CENTER   Main setLocations x  y   Main pack    Main setVisible true

User · Answer

please  something went xxx x  and that s not true at all  check that  JButton Size - java awt Dimension width 400 height 40  JPanel Size - java awt Dimension width 640 height 480  JFrame Size - java awt Dimension width 646 height 505    code  basic stuff from Trail  Creating a GUI With JFC Swing   and yet I still satisfied that that would be outdated    EDIT  forget setDefaultCloseOperation    import java awt BorderLayout  import java awt Dimension  import java awt event ActionEvent  import java awt event ActionListener  import javax swing JButton  import javax swing JFrame  import javax swing JPanel   public class FrameSize        private JFrame frm   new JFrame        private JPanel pnl   new JPanel        private JButton btn   new JButton  Get ScreenSize for JComponents         public FrameSize             btn setPreferredSize new Dimension 400  40            btn addActionListener new ActionListener                   Override             public void actionPerformed ActionEvent e                    System out println  JButton Size -     btn getSize                     System out println  JPanel Size -     pnl getSize                     System out println  JFrame Size -     frm getSize                                       pnl setPreferredSize new Dimension 640  480            pnl add btn  BorderLayout SOUTH           frm add pnl  BorderLayout CENTER           frm setLocation 150  100           frm setDefaultCloseOperation JFrame EXIT ON CLOSE      EDIT         frm setResizable false           frm pack            frm setVisible true              public static void main String   args            java awt EventQueue invokeLater new Runnable                   Override             public void run                     FrameSize fS   new FrameSize

[java] How to Set JPanel's Width and Height?

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