The array instance variable length:
It is important that we do not accidentally attempt to access an array element beyond the array's capacity, as this will give a run-time error. Arrays have an instance variable length, which gives the capacity of the array. The expression:
firstLetters.length
represents the number of locations in the array firstLetters.
Pitfalls with using length
You will have seen the expression:
holder.length
which gives the number of elements in the array holder and you might have wondered why it was different to the use of length with strings, as in:
name.length();
where name references a String. The answer is that length is an instance variable associated with arrays, while length() is a method associated with strings. This is an unfortunate inconsistency in the Java language.
Don't worry if you can't remember which of string and array has a length() method. The compiler will remind you! What is more important is that you try to write code that will continue to work even if your array or string variable references change.
It is also important to bear in mind that array length will give the number of locations in an array, not the number of initialized locations.
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