JPanel（Java）中组件的顺序

Question

How can I decide the order of components when using a JPanel? My code looks something like this:

panel = new JPanel();

panel.add(a);
panel.add(b);
panel.add(c);

[...]

panel.remove(b);

[...]

panel.add(b);

Now, b is added at the end (right). How can I add b again in the middle?

Answer 1

You can use

add(Component comp, int index) 

to insert a component at a given index.

Answer 2

假设您知道要在其中放置组件的索引，则可以使用

add(b, index)

Answer 3

You can add a component at index:

panel.add(b, [index]);

Note that the index is 0-based.

Answer 4

Use index. Also, you may like to look at MigLayout, a library. The best layout manager IMO, very easy to use.