This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The existing source codes, which I try to debug, create the MyTabbedPane class from JTabbedPane.
Clicking the tab will generate the ChangeEvent twice inside the addChangeListener.
Why? Is that to make the ChangeEvent occur once only?