Print out elements from an array with a comma between elements except the last word

Print the first word on its own if it exists. Then print the pattern as comma first, then the next element.

if (arrayListWords.length >= 1) {
    System.out.print(arrayListWords[0]);
}

// note that i starts at 1, since we already printed the element at index 0
for (int i = 1; i < arrayListWords.length, i++) { 
     System.out.print(", " + arrayListWords[i]);
}

With a List, you're better off using an Iterator

// assume String
Iterator<String> it = arrayListWords.iterator();
if (it.hasNext()) {
    System.out.print(it.next());
}
while (it.hasNext()) {
    System.out.print(", " + it.next());
}

I would write it this way:

String separator = "";  // separator here is your ","

for (String s : arrayListWords) {
    System.out.print(separator + s);
    separator = ",";
}

If arrayListWords has two words, it should print out A,B

Using Java 8 Streams:

Stream.of(arrayListWords).collect(Collectors.joining(", "));