Component Orientation, TOP to BOTTOM.

Newbie & Debugging Questions
#1

I am using Gridlayout with 30 rows and 1 column. Thinking of using 15 rows and 2 columns instead but I want to list the first 15 to the left and the last 15 to the right

1 2
3 4

is not what I want

instead

1 16
2 17
3 18
4 19
5 20
6 21
7 22
8 23
9 24
10 25
11 26
12 27
13 28
14 29
15 30

Any way to do it?

#2

put your components in an array and feed the array in the way the GridLayout expects, and AFAIK you can’t change the ordering of components

#3 

JPanel mainPanel = new JPanel(new GridLayout(1, 2));
JPanel leftPanel = new JPanel(new GridLayout(15, 1));
JPanel rightPanel = new JPanel(new GridLayout(15, 1));

mainPanel.add(leftPanel);
mainPanel.add(rightPanel);

Don’t forget that you can layer layout managers. Anytime you are creating a complex layout and are unsure about how to proceed, just make a drawing of the layout and use vertical and horizontal lines to cut the diagram into layout managers.

#4

Indeed, until we get a decent layout manager, that doesn’t require any tools.

#5

If the Components are the same size and there are the same number of Components in each column, you could probably just make a horizontal box of 2 vertical boxes.

But to use GridLayout, you can just add the components in a different order like someone already said.

#6

You can always use setLayout(null) and setBounds(x,y,w,h) on all Components. It can be a pain to do, but has highest precision and flexibility in the end. Using a visual editor might be an idea.

-JAW

#7

Learn to use LayoutManagers effectively and you will be happier for it.

#8

There’s an alternative to null layouts at http://www.swingwiki.org/workaround:fixed_position_layout . I wrote my own slightly different version that uses Rectangles.