Splitting words into letters in Java [duplicate]

You need to use split("");.

That will split it by every character.

However I think it would be better to iterate over a String's characters like so:

for (int i = 0;i < str.length(); i++){
    System.out.println(str.charAt(i));
}

It is unnecessary to create another copy of your String in a different form.

"Stack Me 123 Heppa1 oeu".toCharArray() ?

You can use

String [] strArr = Str.split("");

Including numbers but not whitespace:

"Stack Me 123 Heppa1 oeu".replaceAll("\\W","").toCharArray();

=> S, t, a, c, k, M, e, 1, 2, 3, H, e, p, p, a, 1, o, e, u

Without numbers and whitespace:

"Stack Me 123 Heppa1 oeu".replaceAll("[^a-z^A-Z]","").toCharArray()

=> S, t, a, c, k, M, e, H, e, p, p, a, o, e, u

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