Java 8 Interview Coding Questions


Java 8 Interview Coding Questions

Top Java 8 Interview Coding Questions

Java 8 introduced several new features and enhancements, making it a popular and highly sought-after programming language. As a result, many organizations are including Java 8 interview coding questions in their hiring process to assess a candidate's skills and knowledge. Some common Java 8 interview coding questions include working with functional interfaces, using lambda expressions, and utilizing the new Stream API. Candidates who are well-versed in these concepts and can demonstrate their application in coding challenges have a higher chance of securing a job opportunity in the Java industry.

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1 - What is Lambda Expression in Java 8?

A Lambda Expression in Java 8 is a way to implement functional programming concepts in Java. It allows the creation of anonymous functions which can be passed as a parameter to methods or assigned to variables. Lambda expressions help to write cleaner and more concise code by reducing boilerplate code.

2) How is a Lambda Expression defined?

A Lambda Expression is defined using the “→” operator, also known as the arrow operator. It takes a comma-separated list of parameters, which can be typed or inferred, followed by the arrow operator and the body of the function.

3) Can a Lambda Expression have multiple parameters?

Yes, a Lambda Expression can have multiple parameters. It follows the same comma-separated syntax as regular methods in Java.

4) What is the difference between Method Reference and Lambda Expression?

Method Reference and Lambda Expression both help to achieve functional programming in Java 8. However, the main difference is that Method Reference refers to an existing method while a Lambda Expression defines a new anonymous function.

5) What is Stream API in Java 8?

Stream API is a new addition in Java 8 that provides a set of functions to perform aggregate operations on collections of objects. It allows for efficient and concise processing of large collections of data without using traditional for loops.

6) What is the use of Optional class in Java 8?

The Optional class in Java 8 provides a container object that may or may not contain a non-null value. It is used to avoid NullPointerExceptions and provides a clean way to handle null values in code.

7) How does Parallel Processing work in Java 8 using Streams?

Parallel processing in Java 8 using Streams is achieved by using the parallel() method. This method splits the data into smaller chunks and assigns them to different threads, making use of multi-core processors and improving performance.

8) What are the new functional interfaces added in Java 8?

Java 8 introduced many new functional interfaces, such as Predicate, Consumer, Function, Supplier, and UnaryOperator. These interfaces enable functional programming and can be used as Lambda Expression parameters.

9) How is Date and Time handled in Java 8?

Java 8 introduced the java.time package which provides classes to represent date, time, and time zones. It offers a more efficient and easy-to-use way to handle date and time compared to the legacy Date and Calendar classes.

10) What is the use of the Default Method in Java 8?

The Default Method in Java 8 allows for adding new methods to an existing interface without breaking the classes that implement it. These methods have a default implementation and can be overridden by the implementing classes.

11) Can we have static methods in Interfaces in Java 8?

Yes, we can have static methods in Interfaces in Java 8. These methods can be called directly using the interface name and do not require an instance of the interface to be created.

12) What is the Function Composition in Java 8?

Function Composition in Java 8 is the process of combining two or more functions to create a new function. This allows for code reuse and promotes modular design in functional programming.

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13) How is Multithreading handled in Java 8?

Java 8 introduced the CompletableFuture class which provides a cleaner and more efficient way to handle multithreading. It allows for asynchronous execution and combining multiple asynchronous tasks.

14) What is the use of the @FunctionalInterface annotation in Java 8?

The @FunctionalInterface annotation in Java 8 is used to mark an interface as a functional interface. It serves as a compiler directive and ensures that the interface has only one abstract method, enabling its use with Lambda Expressions.

15) How does Java 8 handle Type Inference?

Java 8 introduced the concept of “target typing”, which allows the compiler to infer the type of a Lambda Expression based on the context in which it is used. This reduces the need for explicit type declarations and makes the code more concise.


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