Java’s String class encapsulates an array of bytes. A byte can be converted to a char, in which case, String becomes an array of characters used to compose words, sentences, or any other data you want ...
Most new Java developers quickly learn that they should generally compare Java Strings using String.equals(Object) rather than using ==. This is emphasized and reinforced to new developers repeatedly ...
It's not terribly clean, but you could use indexOf() and check if it returns -1. Better than breaking out a loop.