我正在向某人的现有Swing代码添加一个组合框。 我在这里做错了什么？

Question

.addGroup(makeBookingLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel48)
                            .addComponent(sittingPull, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(bookingTime2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

I'm trying to place bookingTime2 after sittingPull, to the right. I realise with the current parameters I'm placing them in the same place. I don't understand default_size or preferred_size though. How do I change these parameters to achieve what I want?

Answer 1

you have (last two code lines in void or contructor ) call for JComboBox's container

Xxx.revalidate();
Xxx.repaint();