OCP - Before Exam
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Does DateTimeFormatter throw a Checked Exception or an uncheced?
It throws a DateTimeException which is a RuntimeException
Is it dangerous to ommit the generic type when using Predicate or Function?
Yes:
- Compiler Warning
- Auto Boxing might not work as Expected, eg. boolean will neither be autoboxed into a Boolean nor Object!
Does forEach accept an implementation of Function?
No, only a Consumer implementation!
What happens when catching an checked exception that is not declared by any method in the try block?
The code will not compile!
Can you declare a Method as final?
Yes, instance methods, but not static methods!
Must a ENUM enumeration end with a Semicolon?
The semicolon is only required when methods/constructors are declared afterwards!
What is the difference between Optional.orElse(...) and Optional.orElseGet(...)?
- Optional.orElse(T) returns the provided value
- Optional.orElseGet(Supplier<? extends T>) uses the provided supplier to get the default value
Can a Properties Class be instantiated using a Constructor?
Yes
