Java 8 Interview Questions and Answers

In this tutorial, we’re going to explore some of the important Java 8 Interview questions and answers that might pop up during an interview.

Q1. What are all features of Java8 did you used ?
Ans :
1. Functional Interface
2. Lambda Expression
3. Stream
4. Completable Feature
5. Java DateTime API.

Q2. What is Functional Interface ?
Ans :
An Interface that contains only one abstract method is known as Functional Interface. It can have any number of default and static methods.

Q3. Can you tell few Functional Interface which is already there before Java 8 ?
Ans :
Runnable, Callable and Comparator.

package java.lang;

@FunctionalInterface
public interface Runnable {
/**
* Runs this operation.
*/
void run();
}

@FunctionalInterface
public interface Callable<V> {

V call() throws Exception;
}