While exercising lambdas in Java 8, I came across the below functional interface.
@FunctionalInterface
interface MyFunctional {
void invokeSame(MyFunctional myFunc);
}
Could you tell me how can I provide lambda expression for this Functional interface?
The same way as any other one argument and void return type lambda:
MyFunctional f = myFunc -> {};
Concept: Type checking in java 8 lambdas is done based on target (the function to which it is being passed as an argument).
Explanation: Generally a function is defined by 3 attributes:
But while passing an lambda Java only checks for last two. So for above Functional Interface we need lambda with [first] argument type MyFunctional and return type void.
void doSomething(MyFunctional x) {
...
...
x.invokeSame(...An object/lambda of type MyFunctional...)
}
To call this function
doSomething(varName -> { ...someCode... })
