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Why String.indexOf do not use exception but return -1 when substring not found?
The purpose of this question is: when we start custom exception.
I believe avoid the need to return special error code is right design path.
What’s your opinion?
As a rule of thumb, if the purpose of a method is to check for something, then the lack of that something shouldn’t be an exception. If the method is assuming that something is true, then the absence of that something would be an exception. Thus “File.exists()” doesn’t throw a FileNotFoundException, but “File.open()” does.