Java JTable setting Column Width

Question

I have a JTable in which I set the column size as follows   table setAutoResizeMode JTable AUTO RESIZE OFF   table getColumnModel   getColumn 0  setPreferredWidth 27   table getColumnModel   getColumn 1  setPreferredWidth 120   table getColumnModel   getColumn 2  setPreferredWidth 100   table getColumnModel   getColumn 3  setPreferredWidth 90   table getColumnModel   getColumn 4  setPreferredWidth 90   table getColumnModel   getColumn 6  setPreferredWidth 120   table getColumnModel   getColumn 7  setPreferredWidth 100   table getColumnModel   getColumn 8  setPreferredWidth 95   table getColumnModel   getColumn 9  setPreferredWidth 40   table getColumnModel   getColumn 10  setPreferredWidth 400     This works fine  but when the table is maximized  I get empty space to the right of the last column  Is it possible to make the last column resize to the end of the window when resized   I found AUTO RESIZE LAST COLUMN property in docs but it does not work   Edit  JTable is in a JScrollPane its prefered size is set

User · Answer

Use this code  It worked for me  I considered for 3 columns  Change the loop value for your code   TableColumn column   null  for  int i   0  i  lt  3  i          column   table getColumnModel   getColumn i       if  i    0           column setMaxWidth 10       if  i    2          column setMaxWidth 50

User · Answer

JTable AUTO RESIZE LAST COLUMN is defined as  During all resize operations  apply adjustments to the last column only  which means you have to set the autoresizemode at the end of your code  otherwise setPreferredWidth   won t affect anything   So in your case this would be the correct way   table getColumnModel   getColumn 0  setPreferredWidth 27   table getColumnModel   getColumn 1  setPreferredWidth 120   table getColumnModel   getColumn 2  setPreferredWidth 100   table getColumnModel   getColumn 3  setPreferredWidth 90   table getColumnModel   getColumn 4  setPreferredWidth 90   table getColumnModel   getColumn 6  setPreferredWidth 120   table getColumnModel   getColumn 7  setPreferredWidth 100   table getColumnModel   getColumn 8  setPreferredWidth 95   table getColumnModel   getColumn 9  setPreferredWidth 40   table getColumnModel   getColumn 10  setPreferredWidth 400   table setAutoResizeMode JTable AUTO RESIZE LAST COLUMN

User · Answer

Reading the remark of Kleopatra  her 2nd time she suggested to have a look at javax swing JXTable  and now I Am sorry I didn t have a look the first time      I suggest you follow the link I had this solution for the same problem   but I suggest you follow the link above  On resize the table  scale the table column widths to the current table total width  to do this I use a global array of ints for the  relative  column widths   private int   columnWidths null   I use this function to set the table column widths  public void setColumnWidths int   widths       int nrCols table getModel   getColumnCount        if nrCols  0  widths  null           return            this columnWidths widths clone           current width of the table      int totalWidth table getWidth             int totalWidthRequested 0      int nrRequestedWidths columnWidths length      int defaultWidth  int Math floor  double totalWidth  double nrCols        for int col 0 col lt nrCols col             int width   0          if columnWidths length gt col               width columnWidths col                     totalWidthRequested  width              Note  for the not defined columns  use the defaultWidth     if nrRequestedWidths lt nrCols           log fine  quot Setting column widths  nr of columns do not match column widths requested quot            totalWidthRequested    nrCols-nrRequestedWidths  defaultWidth               calculate the scale for the column width     double factor  double totalWidth  double totalWidthRequested       for int col 0 col lt nrCols col             int width   defaultWidth          if columnWidths length gt col                 scale the requested width to the current table width             width  int Math floor factor  double columnWidths col                      table getColumnModel   getColumn col  setPreferredWidth width           table getColumnModel   getColumn col  setWidth width                 When setting the data I call      setColumnWidths this columnWidths    and on changing I call the ComponentListener set to the parent of the table  in my case the JScrollPane that is the container of my table   public void componentResized ComponentEvent componentEvent        this setColumnWidths this columnWidths      note that the JTable table is also global  private JTable table   And here I set the listener      scrollPane new JScrollPane table       scrollPane addComponentListener this

User · Answer

fireTableStructureChanged      will default the resize behavior   If this method is called somewhere in your code AFTER you did set the column resize properties all your settings will be reset  This side effect can happen indirectly  F e  as a consequence of the linked data model being changed in a way this method is called  after properties are set

User · Answer

Use this method  public static void setColumnWidths JTable table  int    widths        TableColumnModel columnModel   table getColumnModel        for  int i   0  i  lt  widths length  i              if  i  lt  columnModel getColumnCount                  columnModel getColumn i  setMaxWidth widths i                      else break            Or extend the JTable class   public class Table extends JTable       public void setColumnWidths int    widths            for  int i   0  i  lt  widths length  i                  if  i  lt  columnModel getColumnCount                      columnModel getColumn i  setMaxWidth widths i                              else break                      And then  table setColumnWidths 30  150  100  100

User · Answer

With JTable AUTO RESIZE OFF  the table will not change the size of any of the columns for you  so it will take your preferred setting   If it is your goal to have the columns default to your preferred size  except to have the last column fill the rest of the pane  You have the option of using the JTable AUTO RESIZE LAST COLUMN autoResizeMode  but it might be most effective when used with TableColumn setMaxWidth   instead of TableColumn setPreferredWidth   for all but the last column     Once you are satisfied that AUTO RESIZE LAST COLUMN does in fact work  you can experiment with a combination of TableColumn setMaxWidth   and TableColumn setMinWidth

User · Answer

No need for the option  just make the preferred width of the last column the maximum and it will take all the extra space    table getColumnModel   getColumn 0  setPreferredWidth 27   table getColumnModel   getColumn 1  setPreferredWidth 120   table getColumnModel   getColumn 2  setPreferredWidth 100   table getColumnModel   getColumn 3  setPreferredWidth 90   table getColumnModel   getColumn 4  setPreferredWidth 90   table getColumnModel   getColumn 6  setPreferredWidth 120   table getColumnModel   getColumn 7  setPreferredWidth 100   table getColumnModel   getColumn 8  setPreferredWidth 95   table getColumnModel   getColumn 9  setPreferredWidth 40   table getColumnModel   getColumn 10  setPreferredWidth Integer MAX INT

User · Answer

What happens if you call setMinWidth 400  on the last column instead of setPreferredWidth 400    In the JavaDoc for JTable  read the docs for doLayout   very carefully   Here are some choice bits      When the method is called as a result of the resizing of an enclosing window  the   resizingColumn is null  This means that resizing has taken place  outside  the JTable   and the change - or  delta  - should be distributed to all of the columns regardless of   this JTable s automatic resize mode     This might be why AUTO RESIZE LAST COLUMN didn t help you      Note  When a JTable makes adjustments to the widths of the columns it respects their   minimum and maximum values absolutely     This says that you might want to set Min    Max for all but the last columns  then set Min   Preferred on the last column and either not set Max or set a very large value for Max

User · Answer

This code is worked for me without setAutoResizeModes          TableColumnModel columnModel   jTable1 getColumnModel            columnModel getColumn 1  setPreferredWidth 170           columnModel getColumn 1  setMaxWidth 170           columnModel getColumn 2  setPreferredWidth 150           columnModel getColumn 2  setMaxWidth 150           columnModel getColumn 3  setPreferredWidth 40           columnModel getColumn 3  setMaxWidth 40

[java] Java JTable setting Column Width

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