Based on the title of this question, I came here wanting to convert a String into an array of substrings divided by some delimiter. I will add that answer here for others who may have the same question.
This makes an array of words by splitting the string at every space:
String str = "string to string array conversion in java";
String delimiter = " ";
String strArray[] = str.split(delimiter);
This creates the following array:
// [string, to, string, array, conversion, in, java]
Tested in Java 8