How to set specific window frame size in java swing

Question

My code does not work   JFrame frame   new JFrame  mull     mull panel   new mull        add panel to the center of window frame getContentPane   add  Center   panel   frame setSize 500  300       lt  lt  not working    frame setDefaultCloseOperation JFrame EXIT ON CLOSE   frame pack       give a suitable size to window automatically frame setVisible true      make window visible   I am getting very small window  How to fix it

User · Answer

Try this  but you can adjust frame size with bounds and edit title  package co form Try   import javax swing JFrame   public class Form        public static void main String   args            JFrame obj  new JFrame            obj setBounds 10 10 700 600            obj setTitle  quot Application Form quot            obj setResizable false                           obj setVisible true                  obj setDefaultCloseOperation JFrame EXIT ON CLOSE

User · Answer

Most layout managers work best with a component s preferredSize  and most GUI s are best off allowing the components they contain to set their own preferredSizes based on their content or properties   To use these layout managers to their best advantage  do call pack   on your top level containers such as your JFrames before making them visible as this will tell these managers to do their actions -- to layout their components   Often when I ve needed to play a more direct role in setting the size of one of my components  I ll override getPreferredSize and have it return a Dimension that is larger than the super preferredSize  or if not then it returns the super s value    For example  here s a small drag-a-rectangle app that I created for another question on this site   import java awt    import java awt event    import javax swing     public class MoveRect extends JPanel      private static final int RECT W   90     private static final int RECT H   70     private static final int PREF W   600     private static final int PREF H   300     private static final Color DRAW RECT COLOR   Color black     private static final Color DRAG RECT COLOR   new Color 180  200  255      private Rectangle rect   new Rectangle 25  25  RECT W  RECT H      private boolean dragging   false     private int deltaX   0     private int deltaY   0      public MoveRect           MyMouseAdapter myMouseAdapter   new MyMouseAdapter          addMouseListener myMouseAdapter         addMouseMotionListener myMouseAdapter             Override    protected void paintComponent Graphics g          super paintComponent g         if  rect    null             Color c   dragging   DRAG RECT COLOR   DRAW RECT COLOR           g setColor c            Graphics2D g2    Graphics2D  g           g2 draw rect                     Override    public Dimension getPreferredSize           return new Dimension PREF W  PREF H            private class MyMouseAdapter extends MouseAdapter           Override       public void mousePressed MouseEvent e             Point mousePoint   e getPoint             if  rect contains mousePoint                 dragging   true              deltaX   rect x - mousePoint x              deltaY   rect y - mousePoint y                             Override       public void mouseReleased MouseEvent e             dragging   false           repaint                    Override       public void mouseDragged MouseEvent e             Point p2   e getPoint             if  dragging                int x   p2 x   deltaX              int y   p2 y   deltaY              rect   new Rectangle x  y  RECT W  RECT H               MoveRect this repaint                                private static void createAndShowGui           MoveRect mainPanel   new MoveRect           JFrame frame   new JFrame  MoveRect          frame setDefaultCloseOperation JFrame EXIT ON CLOSE         frame getContentPane   add mainPanel         frame pack          frame setLocationByPlatform true         frame setVisible true            public static void main String   args          SwingUtilities invokeLater new Runnable              public void run                 createAndShowGui                                  Note that my main class is a JPanel  and that I override JPanel s getPreferredSize   public class MoveRect extends JPanel             deleted constants     private static final int PREF W   600     private static final int PREF H   300             deleted fields and constants           deleted methods and constructors      Override    public Dimension getPreferredSize           return new Dimension PREF W  PREF H          Also note that when I display my GUI  I place it into a JFrame  call pack     on the JFrame  set its position  and then call setVisible true   on my JFrame      private static void createAndShowGui           MoveRect mainPanel   new MoveRect           JFrame frame   new JFrame  MoveRect          frame setDefaultCloseOperation JFrame EXIT ON CLOSE         frame getContentPane   add mainPanel         frame pack          frame setLocationByPlatform true         frame setVisible true            public static void main String   args          SwingUtilities invokeLater new Runnable              public void run                 createAndShowGui

User · Answer

Well  you are using both frame setSize   and frame pack     You should use one of them at one time   Using setSize   you can give the size of frame you want but if you use pack    it will automatically change the size of the frames according to the size of components in it  It will not consider the size you have mentioned earlier   Try removing frame pack   from your code or putting it before setting size and then run it

[java] How to set specific window (frame) size in java swing?

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