Automatically size JPanel inside JFrame

Question

I have a JPanel subclass on which I add buttons  labels  tables  etc  To show on screen it I use JFrame   MainPanel mainPanel   new MainPanel      JPanel subclass  JFrame mainFrame   new JFrame    mainFrame setTitle  main window title    mainFrame getContentPane   add mainPanel   mainFrame setLocation 100  100   mainFrame pack    mainFrame setVisible true   mainFrame setDefaultCloseOperation JFrame EXIT ON CLOSE     But when I size the window  size of panel don t change  How to make size of panel to be the same as the size of window even if it was resized

User · Answer

You need to set a layout manager for the JFrame to use - This deals with how components are positioned. A useful one is the BorderLayout manager.

Simply adding the following line of code should fix your problems:

mainFrame.setLayout(new BorderLayout());

(Do this before adding components to the JFrame)

User · Answer

You can set a layout manager like BorderLayout and then define more specifically  where your panel should go   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new BorderLayout     mainFrame add mainPanel  BorderLayout CENTER   mainFrame pack    mainFrame setVisible true     This puts the panel into the center area of the frame and lets it grow automatically when resizing the frame

User · Answer

From my experience  I used GridLayout       thePanel setLayout new GridLayout a b c d      a   row number  b   column number  c   horizontal gap  d   vertical gap   For example  if I want to create panel with    unlimited row  set a   0  1 column  set b   1  vertical gap  3  set d   3    The code is below       thePanel setLayout new GridLayout 0 1 0 3      This method is useful when you want to add JScrollPane to your JPanel  Size of the JPanel inside JScrollPane will automatically changes when you add some components on it  so the JScrollPane will automatically reset the scroll bar

User · Answer

You can set a layout manager like BorderLayout and then define more specifically  where your panel should go   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new BorderLayout     mainFrame add mainPanel  BorderLayout CENTER   mainFrame pack    mainFrame setVisible true     This puts the panel into the center area of the frame and lets it grow automatically when resizing the frame

User · Answer

You need to set a layout manager for the JFrame to use - This deals with how components are positioned. A useful one is the BorderLayout manager.

Simply adding the following line of code should fix your problems:

mainFrame.setLayout(new BorderLayout());

(Do this before adding components to the JFrame)

User · Answer

If the BorderLayout option provided by our friends doesnot work  try adding ComponentListerner to the JFrame and implement the componentResized event  method  When the JFrame object will be resized  this method will be called  So if you write the the code to set the size of the JPanel in this method  you will achieve the intended result   Ya  I know this  solution  is not good but use it as a safety net

User · Answer

As other posters have said  you need to change the LayoutManager being used   I always preferred using a GridLayout so your code would become   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new GridLayout     mainFrame pack    mainFrame setVisible true     GridLayout seems more conceptually correct to me when you want your panel to take up the entire screen

User · Answer

As other posters have said  you need to change the LayoutManager being used   I always preferred using a GridLayout so your code would become   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new GridLayout     mainFrame pack    mainFrame setVisible true     GridLayout seems more conceptually correct to me when you want your panel to take up the entire screen

User · Answer

You can set a layout manager like BorderLayout and then define more specifically  where your panel should go   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new BorderLayout     mainFrame add mainPanel  BorderLayout CENTER   mainFrame pack    mainFrame setVisible true     This puts the panel into the center area of the frame and lets it grow automatically when resizing the frame

User · Answer

If the BorderLayout option provided by our friends doesnot work  try adding ComponentListerner to the JFrame and implement the componentResized event  method  When the JFrame object will be resized  this method will be called  So if you write the the code to set the size of the JPanel in this method  you will achieve the intended result   Ya  I know this  solution  is not good but use it as a safety net

User · Answer

If the BorderLayout option provided by our friends doesnot work  try adding ComponentListerner to the JFrame and implement the componentResized event  method  When the JFrame object will be resized  this method will be called  So if you write the the code to set the size of the JPanel in this method  you will achieve the intended result   Ya  I know this  solution  is not good but use it as a safety net

User · Answer

You need to set a layout manager for the JFrame to use - This deals with how components are positioned. A useful one is the BorderLayout manager.

Simply adding the following line of code should fix your problems:

mainFrame.setLayout(new BorderLayout());

(Do this before adding components to the JFrame)

User · Answer

You can set a layout manager like BorderLayout and then define more specifically  where your panel should go   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new BorderLayout     mainFrame add mainPanel  BorderLayout CENTER   mainFrame pack    mainFrame setVisible true     This puts the panel into the center area of the frame and lets it grow automatically when resizing the frame

User · Answer

If the BorderLayout option provided by our friends doesnot work  try adding ComponentListerner to the JFrame and implement the componentResized event  method  When the JFrame object will be resized  this method will be called  So if you write the the code to set the size of the JPanel in this method  you will achieve the intended result   Ya  I know this  solution  is not good but use it as a safety net

User · Answer

From my experience  I used GridLayout       thePanel setLayout new GridLayout a b c d      a   row number  b   column number  c   horizontal gap  d   vertical gap   For example  if I want to create panel with    unlimited row  set a   0  1 column  set b   1  vertical gap  3  set d   3    The code is below       thePanel setLayout new GridLayout 0 1 0 3      This method is useful when you want to add JScrollPane to your JPanel  Size of the JPanel inside JScrollPane will automatically changes when you add some components on it  so the JScrollPane will automatically reset the scroll bar

User · Answer

You need to set a layout manager for the JFrame to use - This deals with how components are positioned. A useful one is the BorderLayout manager.

Simply adding the following line of code should fix your problems:

mainFrame.setLayout(new BorderLayout());

(Do this before adding components to the JFrame)

User · Answer

As other posters have said  you need to change the LayoutManager being used   I always preferred using a GridLayout so your code would become   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new GridLayout     mainFrame pack    mainFrame setVisible true     GridLayout seems more conceptually correct to me when you want your panel to take up the entire screen

User · Answer

As other posters have said  you need to change the LayoutManager being used   I always preferred using a GridLayout so your code would become   MainPanel mainPanel   new MainPanel    JFrame mainFrame   new JFrame    mainFrame setLayout new GridLayout     mainFrame pack    mainFrame setVisible true     GridLayout seems more conceptually correct to me when you want your panel to take up the entire screen

[java] Automatically size JPanel inside JFrame

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