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.
Based on the application requirements, if you need to implement the same code else where other than the listeners, i don't think the performance would be an issue since the same processing would occur anyway. The container will cache listeners instance and reuse them. In return, you get better manageability of your code by implementing explicitly your event handling code in well defined interfaces.
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