[java] Java: How to split a string by a number of characters?

I tried to search online to solve this question but I didn't found anything.

I wrote the following abstract code to explain what I'm asking:

String text = "how are you?";

String[] textArray= text.splitByNumber(4); //this method is what I'm asking
textArray[0]; //it contains "how "
textArray[1]; //it contains "are "
textArray[2]; //it contains "you?"

The method splitByNumber splits the string "text" every 4 characters. How I can create this method??

Many Thanks