Problem In Swing Components

I have no. of problems related to Swing. If you have the solution do reply to me.

MY problems are:
1) JTABLE: I want to decide the no. of rows at runtime. Actually I need to show the database entries via Table. And these entries can be any no. So How I can Do this????

2) JTABLE: Second problem with JTABLE is : whenever I write something on the Table Cells, It remains at the left most part of the cell. But I want , It should be at the Center(I try for "Center" but Its not working). More specific: I want my table to work Like the Tables in Ms EXCEL.

3) JTEXTAREA: Whenever I write something, it continues in a single line until and unless I press enter button. Can't be possible that when Boundary encounters cursor automatically move to next line(Like MS WORD); (And SAME WITH JTEXTFIELD.)

4) BUTTONGROUP: Its not working in JDK1.5. Any other alternative

1 — use a DefaultTableModel in your table and then call setRowCount in the model:

Code:

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((DefaultTableModel)table.getModel()).setRowCount(yourCount);

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2 —

Code:

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DefaultTableCellRenderer renderer =
    (DefaultTableCellRenderer)table.getDefaultRenderer(String.class);
renderer.setHorizontalAlignment(JLabel.CENTER);

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3 —

Code:

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textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);

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4 — I have never had trouble with ButtonGroup in j2se 1.5
How are you using it to conclude that it is "not working?"

See Lesson: Using Swing Components for more.