What is a Functional Interface and why it is needed
FI is an interface that contains SAM.
FI enables us to make use of lambda expressions.
FI enables us to make use of functional programming.
Ex.
Runnable
Callable
Supplier
Consumer
Function
Predicate
Contains only 1 single abstract method.
Can Contain n number of Defaults methods.
Can Contain n number of Static methods.
Contains @FunctionalInterface annotation so that compiler can throw error immediately.
History of Functional Interfaces.
How to use Functional Interface in Java.
Types of Functional Interfaces in Java.
Types of Functional Interfaces in Java.
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