Check methods params_for_validity

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This presentation explains how and why we should check method parameters for validity as a good programming practice in Java.

Technologie Wirtschaft & Finanzen

Writing Effective Methods in Java

Parag Shah

http://www.diycomputerscience.com

Always check method parameters for validity

WHY ?

Because we should always fail fast !

What will happen if we do not ?

We may get an Exception which is unrelated
We may get an incorrect result
We may create an object which will fail at a totally
different and unrelated time

What should be checked ?

Constructors
Public, protected, package methods

When not to check ?

If the check is very expensive
a method which expects a sorted list
If the check will be done implicitly in the
computation
sorting automatically checks for comparable
instances
Possible to omit checks in private methods

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Check methods params_for_validity

1. Writing Effective Methods in Java Parag Shah http://www.diycomputerscience.com

2. Always check method parameters for validity

3. WHY ? Because we should always fail fast !

4. An example

5. What will happen if we do not ? We may get an Exception which is unrelated We may get an incorrect result We may create an object which will fail at a totally different and unrelated time

6. What should be checked ? Constructors Public, protected, package methods

7. When not to check ? If the check is very expensive a method which expects a sorted list If the check will be done implicitly in the computation sorting automatically checks for comparable instances Possible to omit checks in private methods