Chapter 2. Defensive Programming

Defensive programming is carefully guarded programming that helps you to construct reliable software by designing each component to protect itself as much as possible: for example, by checking that undocumented assumptions remain valid [Goodliffe 2007]. The guidelines in this chapter address areas of the Java language that can help to constrain the effect of an error or help to recover from an error.

Java language mechanisms should be used to limit the scope, lifetime, and accessibility of program resources. Also, Java annotations can be used to document the program, aiding readability and maintenance. Java programmers should be aware of implicit behaviors and avoid unwarranted assumptions about how the system ...

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