Check if string is a punctuation character

Question

Let\'s say I have a String array that contains some letters and punctuation

String letter[] = {\"a\",\"b\",\"c\",\".\",\"a\"};

In letter[3]

Answer 1

Do you want to check more punctuations other than just .?

If so you can do this.

String punctuations = ".,:;";//add all the punctuation marks you want.
...
if(punctuations.contains(letter[a]))