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How to hide the Jtable column data?

I want to hide data of a column of Jtable, but not hide the column view,just its data.
The column contain data about profit and the customer doesn't want to show the profit but in my code I use the values of this column and get it when the user select specified row.
How do I achieve the customer need and still be able to get the values of this column when selecting it after hiding its data(displaying column as empty but still has its values)?

You need to remove the TableColumn from the TableColumnModel of the JTable. For example:
table.removeColumn( table.getColumn(...) );
Now the column will not display in the table, but the data is still available in the TableModel. to access the data you use:
table.getModel().getValueAt(...);

You could try a subclassing DefaultTableCellRenderer, and call setCellRenderer. When the relevant column number is passed to getTableCellRendererComponent, return a blank JLabel, otherwise call the default super.getTableCellRendererComponent.
This should mean the column is still visible, but each cell will be blank.
If you want to display the data when a row is selected, you will need add a listener to the selection model (from getSelectionModel) to store the selected row in a variable, and call a repaint. You can then use this value in your CellRenderer.

Why don't you just let the dataModel control what is shown? I'm assuming you are using a tableModel.
All you have to do is change the getValueAt(..) method so that it does not return a value for the column you do not want to show. Make sure that getColumnCount() method is reduced by one as well.

Edit column with stylename

I have a celltable with some columns, and want make 2 of them hidden, I tried to make a celltable column hidden, while doing following with css stylename:
firstColumn.setCellStyleNames("hide");
css:
.hide{
display:none;
}
but I get only the rows hidden, but not the header of the column, and the table not passed to the rest column, but there is still a white space on the column, I want to get hide all column with it header, how can I do it, any suggestion please?

The .setCellSomething will have effect only on the inner rows, not on the header. For that, use .setHeaderSomething, so:
firstColumn.setHeaderStyleNames("hide");
Gwt Project Docs - setHeaderStyleNames

Select table values to text field using SWT?

I have Table (TableViewer) containing TableItems with values. I have another class TextField mapped according to table column name.
Now my question is: When I select any row in table, the values in that row should get reflected in Text field. In Text field I can edit these vales and save to to table. Please let me know how I can achieve this?

What ever "Baz" has said is the right thing to do. If editing is table data is requirement, then make the table columns as editable. But if you want to specifically edit table row separately in a control (like Text field), then get IStructuredSelection from TableViewer and get the data in control to edit. Then after you edit, get the data back from control and set it back to table. Hope it helps.

Disable a single column dragging in JTable

How should I disable just a single column from dragging in JTable? I want to allow other columns from dragging but just the first column (indexed at 0). Thanks.

You should be able to create your own TableColumnModel (extend DefaultTableColumnModel) and to override moveColumn to only call super.moveColumn when the column is allowed to be dragged.
EDIT: Have a look at this post first.

Not quite on point for you ....found on another blog
yourJTable.getTableHeader().setReorderingAllowed(false)
this gets the entire table not to reorder columns which is what I needed. Exploring the Override is the correct route

How to change data in JTable cells?

I can set data in JTable constructor, and then user can change this data when program is running manually(typing from keyboard).
But what method should I use in case I want to change data in some column? To change column header I use TableColumn method setHeaderValue. What should I use to set value in JTable cell?

If you want to allow users to edit the data, then you need to set a TableCellEditor on the cells that you want people to edit. You probably also want to start using a TableModel instead of hard coding the data in the JTable itself.
See http://java.sun.com/docs/books/tutorial/uiswing/components/table.html

While creating the JTable you first need to specify that the values of particular column are editable. You can obviously also provide the row basis edit functionality. but all these things you should define while ccreating the table itself. Please reply if you need any help on this.