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Tag: functional-interface
When to use Functional Interface vs Function
I am using Java 11, and we have two ways of passing in functions as an argument. functional interface Function<T, Y> Now I am not able to find anything on when to use which one. I can figure that we can use a generic functional interface over a Function<T,Y> when we either don’t want to pass any arguments or have
Replace class methods with lambda expressions, is it bad practice?
I had a few questions that I’m having trouble finding the answer to, at least in Java. I saw a Class definition in a tutorial where lambdas were being used similar to methods. So I’m curious as to if there is any benefit apart from concise code and style preference. Example: Is this a valid class definition? Is this a
Trying to mimic java functional interface
I am trying to mimic the java’s Function<T,R> by writing below code : when I am writing below code in andThen, it’s working fine (pointing to apply(T t) of interface) and perfectly chaining the other functional implementations But when writing below snippet, it’s falling into recursion, logically that’s correct , but why in snippet A, after.apply(apply(t)) is calling outer apply(T
incompatible types: bad return type in lambda expression | void is not a functional interface
I am going through Java 8 Feature and using Jshell to explore it. I tried to run the below command: But it failed with the below error: I didn’t get exactly what’s the issue Consumer takes one argument and return nothing. Same I am doing here by passing 1 arg str and printing. So what’s the issue with this syntax.
Can Functional Interfaces with generic type be stored in a static map?
I have used a static map to store a series of Functional Interfaces which associated with three classes A, B and C all inherited from a parent class. The code runs smoothly as follow: However, there is a warning “Raw use of parameterized class ‘BiConsumer'” on the usage of Biconsumer in the static map. I tried various ways to add
Java Consumer MethodReference for nonstatic methods
Code snippet: } Which type of functionalInterface can I use instead SomeConsumer? The main issue here is that it is not static field, and the object I will only know in runtime. I tried to use BiConsumer, however it tells me that I can not refer to non static method in this way. Answer From your usage here: It is
When and why would you use Java’s Supplier and Consumer interfaces?
As a non-Java programmer learning Java, I am reading about Supplier and Consumer interfaces at the moment. And I can’t wrap my head around their usage and meaning. When and why you would use these interfaces? Can someone give me a simple layperson example of this? I’m finding the Doc examples not succinct enough for my understanding. Answer This is