Adding Column to JTable

[David Serio]

Hello, I am trying to add a column to a JTable. I am able to do this with one section of code but not sure why the second section of code does not work.

Working (iTable is of type JTable):

	TableColumn tc = new TableColumn();
	tc.setHeaderValue("Item");
	iTable.addColumn(tc);

Not working:

	iTable.addColumn((new TableColumn()).setHeaderValue("Item"));

Error:

.\ItemTable.java:23: 'void' type not allowed here
iTable.addColumn((new TableColumn()).setHeaderValue("Item"));
^
1 error

The ^ is pointing to ("Item").....

I'm not sure why I am getting this error. It looks like I am collapsing the working code into one line, but obviously I'm doing something wrong. Any ideas?

Thanks.

[pete stein]

David Serio wrote:
Not working:

	iTable.addColumn((new TableColumn()).setHeaderValue("Item"));

Error:

.\ItemTable.java:23: 'void' type not allowed here
iTable.addColumn((new TableColumn()).setHeaderValue("Item"));
1 error

You're trying to chain your methods in a way that is not possible. If setHeaderValue(...) returned the TableColumn object that is calling this method, then you're golden, but if you go to the TableColumn API and look up the setHeaderValue() method, you'll see that it doesn't, it returns void. So what you are doing here is by trying to save a few lines you end up trying to pass void as the parameter to your addColumn method, and this just won't work.

Solution: just don't do it.

[Gerbrand van Dieijen]

David Serio wrote:
Not working:

	iTable.addColumn((new TableColumn()).setHeaderValue("Item"));

As stated in the javadoc on JTable
the addColumn method has void return type.
So a corect syntax could be:

TableColumn c=new TableColumn();
c.setHeaderValue("Item"));
iTable.addColumn(c);

[David Serio]

pete stein wrote:

David Serio wrote:
Not working:

	iTable.addColumn((new TableColumn()).setHeaderValue("Item"));

Error:

.\ItemTable.java:23: 'void' type not allowed here
iTable.addColumn((new TableColumn()).setHeaderValue("Item"));
1 error

You're trying to chain your methods in a way that is not possible. If setHeaderValue(...) returned the TableColumn object that is calling this method, then you're golden, but if you go to the TableColumn API and look up the setHeaderValue() method, you'll see that it doesn't, it returns void. So what you are doing here is by trying to save a few lines you end up trying to pass void as the parameter to your addColumn method, and this just won't work.

Solution: just don't do it.

That makes sense. Thanks for your help.

[pete stein]

David Serio wrote:
That makes sense. Thanks for your help.

You're quite welcome!