JTable sizing issue

Question

I am having an issue with JTables I know my code is a little hard to follow, it\'s also a little jumbled around because it\'s coming from a fairly big program. And yes I just le

Answer 1

1. JTable can't returns proper Dimension or PreferredSize, there are three ways

2. table.setPreferredScrollableViewportSize(table.getPreferredSize()); but notice for small JTables with a few Rows and Columns too

3. to calculate desired size for (part) of Columns and (part) Rows too, then pass this Dimension in form table.setPreferredScrollableViewportSize(new Dimension(x, y));

4. override getPreferredSize for JScrollPane

5. then JFrame.pack(before JFrame.setVisible(true)) to calculate desired Size on the screen

6. JPanel has FlowLayout implemented in API, I'd to suggest to change to BorderLayout, then JScrollPane in CENTER area can fill whole (available) area and will be resizable with JFrame, not possible to resize JComponent (together with its container) layed by FlowLayout

7. have to call data.revalidate(), data.repaint() and Show.pack() as last code lines instead of (remove this code line) Show.setVisible(true);

8. rename Show to myFrame and show to myButton

Answer 2

What exactly does the setPreferredScrollableViewportSize do? Does it just force the table to always be that size? What is the whole pack thing?

The getPreferredScrollableViewportSize() method is defined in the Scrollable interface, discussed in Implementing a Scrolling-Savvy Client. Rather than setting the preferred size, you can override getPreferredScrollableViewportSize() to change the default. Making the height a multiple of getRowHeight() is illustrated here. More on preferred size may be found here. Conveniently, the pack() method "Causes this Window to be sized to fit the preferred size and layouts of its subcomponents."