桌上的Java Swing滚动条我看过很多不同的指南，似乎没有用

Question

I've been writing a constructor. To create a table. However I want it to have scroll bars on the table. I've been doing a lot of searching on how to do it correctly. However it doesn't seem to be working. I am unsure as to where I am going wrong.

public ApplicationPanel(String[][] data, String[] colNames)
{   
   JTable table = new JTable(data, colNames);

   table.setPreferredScrollableViewportSize(new Dimension(450, 65));
   table.setFillsViewportHeight(true);
   TableColumn column;

   JScrollPane scrollPane = new JScrollPane(table);

   scrollPane.setPreferredSize(new Dimension(900,800));

 //  column.setResizable(true);
   for (int i = 0; i<4; i++)
   {
       column = table.getColumnModel().getColumn(i);
       if (i == 2)
       {
           column.setPreferredWidth(400);     
       }
       else
       {
           column.setPreferredWidth(50);
       }
   }
   this.add(scrollPane);
}

Answer 1

Filled the area as @alex2410 suggested with the following code added to the constructor.

 this.setLayout(new GridLayout());

After which table scroll bars are now viewable. Combine this with the code above (minus the code below and you should have a working table constructor with scroll bars.

The following code was removed and at some point was in the code. So for reference these do not appear to have any effect of which I can tell.

   table.setPreferredScrollableViewportSize(new Dimension(450, 65));
   table.setFillsViewportHeight(true);
   table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
   scrollPane = new JScrollPane(table,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_S‌​CROLLBAR_ALWAYS);
   ApplicationFrame.getFrames().getContentPane().add( new JScrollPane( table ), BorderLayout.CENTER );
   column.setResizable(true);