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I have an interface with several method definitions, and I would not like to require some of them.
Is this possible? if so, how can i implement this?
I have tried setting an annotation of @Optional but this doesn't seem to work.
Do i have to define the Optional annotation somewhere?
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The "third statement" says that abstract interface methods must always be implemented and this remains true in Java 8+. However, as in the Java Collections Framework, it is possible to describe some abstract interface methods as "optional" in the contract.
Optional is a container object used to contain not-null objects. Optional object is used to represent null with absent value. This class has various utility methods to facilitate code to handle values as 'available' or 'not available' instead of checking null values.
The Optional type was introduced in Java 8. It provides a clear and explicit way to convey the message that there may not be a value, without using null. When getting an Optional return type, we're likely to check if the value is missing, leading to fewer NullPointerExceptions in the applications.
There is no @Optional annotation in Java. One thing you can do is to create an interface, and then create an abstract class that provides stub implementations. Your classes can then extend this base class and override the methods they are interested in.
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