Modern Java in Action

Chapter 2. Passing code with behavior parameterization

This chapter covers

• Coping with changing requirements
• Behavior parameterization
• Anonymous classes
• Preview of lambda expressions
• Real-world examples: Comparator, Runnable, and GUI

A well-known problem in software engineering is that no matter what you do, user requirements will change. For example, imagine an application to help a farmer understand his inventory. The farmer might want a functionality to find all green apples in his inventory. But the next day he might tell you, “Actually, I also want to find all apples heavier than 150 g.” Two days later, the farmer comes back and adds, “It would be really nice if I could find all apples that are green and heavier than 150 g.” How can ...