Usage of BiConsumer interface in java 8

Question

I'm new to programming with streams and functional interfaces and the java.util.function.BiConsumer describes the method accept like below in the documentation which is not clear to understand

void accept(T t,
            U u)
Performs this operation on the given arguments.
Parameters:
t - the first input argument
u - the second input argument

Functional interfaces can be referred using the lamda expressions like below

BiConsumer<String,String> a=(a,b)->{
 
}

But what does the "this operation mean here exactly". Thanks in advance

Answer 1

Note that a BiConsumer represents an "operation" that takes 2 parameters.

For example, if you have

BiConsumer<String,String> foo = (a, b) -> System.out.println(a + b);

foo represents the operation System.out.println(a + b); - printing the two parameters concatenated together.

"This operation" just means the operation that the BiConsumer instance represents.

So in the example above, "this operation" for foo just means "System.out.println(a + b);".

The documentation is saying that if you call accept, the operation represented by the instance (for foo, it is System.out.println(a + b);) will be performed.