Thread: JScollPane JTable etc

Guys

I'm a complete newby to Java, trying desperately to convert from VB.NET. For days now I have been struggling to implement an interface that I consider to be extremely easy in VB Net.

I have a JTable that has a checkbox -when it is clicked it will expand 2 hidden(size set to zero) columns that contain images.

The JTable is within a JScrollPane. I can't get the scrollpane to resize to the wider Table, with scroll bars if needed. I also need the scrollpane to resize, if needed, when the form is resized. I can't get horizontal scroll bars.

All the above is in a JPanel using GridbagLayout.

Initially I don't think including my lines of code will help much. I'm hoping someone can point me to an example that services much the same requirements.

I've looked at many code snippets but most are beyond my current limited Java knowledge.

Here is a precis of the code:-

 
      CoinTable = new JTable();
      // CoinTable.setAutoResizeMode(JTable.AUTO_RESIZE_LAST_COLUMN);
      final DefaultTableModel CoinTableModel = new DefaultTableModel(); 
      CoinTableModel.addColumn("Year");
      CoinTableModel.addColumn("Grade");
      CoinTableModel.addColumn("img");
      CoinTableModel.addColumn("Obverse");
      CoinTableModel.addColumn("Reverse");
      CoinTableModel.addColumn("Weight");
      CoinTableModel.addColumn("Note");
 
      etc
 
      final JScrollPane scrollPane = new JScrollPane();
      CoinTable.setFillsViewportHeight(true);
      scrollPane.setViewportView(CoinTable);
      scrollPane.setPreferredSize(new Dimension(CoinTable.getSize()));
 
     // if I take the above line out NOTHING appears!
 
       listCoinsBody.add(scrollPane);
 
       cons.weightx = cons.weighty = 1;
 
       cons.gridx=0;
       cons.gridy=1;
 
      listCoinsPNL.add(listCoinsBody,cons);
 
       frame.pack();
       frame.setSize(1130,633);
 
        scrollPane.setPreferredSize(new Dimension(CoinTable.getSize()));
 
       // again if I take this out nothing appears.

Guys

Lack of feedback:- I'm beginning to think this is not a Newbie trivial error. Since posting I've explored many postings for a possible explanation, tried many things, and I just cannot advance. The features I require are so simple for an experienced VB.Net programmer(and a programmer in many languages for over 40 years) - why so complicated in Java? I've wasted days and many MANY hours trying to get a simple GUI requirement working in Java. I don't want to give up, and will not.

Someone out there must have done this before?!

Extremely disappointed and frustrated!

Just in case it makes a difference I'm using Netbeans!

Thanks for the reply Andbin

Lets see if a picture(S) is really worth a thousand words
Here s the VB.NET GUI unchecked

java1.jpg

Here is the VB>NET GUI with a row checked

java3.jpg

Notice the scroll bars

You may be right - I have be-dugged Cointable.getsize() returns oxo before the frame is packed and displayed even after dolayout.

ListCoinsBody is a JPanel with a GridBoxLayout(Is this the problem? a Jscoll within a Janel? - probably not)

I re-iterate that I am a complete novice to JAVA so have probably inadvertently broken a basic rule.

Any hints/advice will be much appreciated as I am getting close to throwing the toys out of the pram!

Maybe I should read the Java Tutorial from start to finish before trying a major re-write!

I'm after the same as clearly displayed in the netbeans screen dump lower right hand side panel:-
NetBeansDump.jpg