How can I check if a single character appears in a string?

In Java is there a way to check the condition:

"Does this single character appear at all in string x"

without using a loop?

You can use string.indexOf('a').

If the char a is present in string :

it returns the the index of the first occurrence of the character in the character sequence represented by this object, or -1 if the character does not occur.

• String.contains() which checks if the string contains a specified sequence of char values
• String.indexOf() which returns the index within the string of the first occurence of the specified character or substring (there are 4 variations of this method)