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In this section you will learn how to enhance an object model with these annotations.

There are the following three types of bean constraints: When using field-level constraints field access strategy is used to access the value to be validated.

It's rarely useful to validate a single character: usually, you'll want to validate a whole string.

You should name your function to avoid giving the impression that it checks for multi-character strings.

Think of yourself as a contributing factor to a future coding accident.

If you really want to omit braces, then put the statement on the same line, so that there is no possibility of misinterpretation.

The function does not check for overlong encodings, invalid byte sequences, or invalid code points. I would eliminate the special case into the regular logic.

In general, text is more likely to contain shorter UTF-8 sequences than longer ones, so you might as well handle the shorter cases first to save a few CPU cycles. That makes the code more readable (and saves one pointless subtraction). Just AND with the bitmask to specify which bits you are interested in inspecting.

Example 2.2, “Property level constraint” uses the same entity as in Example 2.1, “Field level constraint”, however, property level constraints are used..

We have to differentiate between three different type of constraint annotations - field-, property-, and class-level annotations.

When using field level constraints field access strategy is used to access the value to be validated.

If I enter something other than a, b ,c ,or d it will terminate....where I am I going wrong? Hello, When I looked at your code I felt that the "while" loop was trouble : D The next thing was the use of "&&", which is the logic operator AND therefore you were checking that: (array Answers[index]!

Should I be validating at the String for user input or am I validating/comparing the user answers in the wrong manner?