using .indexOf() in jShell
> "Hello world".indexOf('e');
java.lang.Integer res = 1
> "Hello world".indexOf('7');
java.lang.Integer res = -1using .indexOf() in jShell
> "Hello world".indexOf('e');
java.lang.Integer res = 1
> "Hello world".indexOf('7');
java.lang.Integer res = -1Copyright © 2021 Codeinu
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