Java 1.8 Interview Questions

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Java 1.8 Interview Questions

Top Java 1.8 Interview Questions

Java 1.8 introduced many new features and updates, making it an important version for Java developers. Some of the popular interview questions related to Java 1.8 revolve around topics such as Lambda expressions, default and static methods in interfaces, functional interfaces, method reference, Streams API, Java.time package, and improvements in the Collection framework. These questions assess the candidate's understanding of the new features and how they can be used to write more efficient and concise code. Employers are looking for candidates who are proficient in Java 1.8 and can leverage its features to write high-quality code.

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1 - What is Java 1.8?

Java 1.8, also known as Java SE 8, is the eighth major version of the Java programming language released in March 2014 by Oracle Corporation. It is a widely used programming language for developing applications and is known for its platform independence, robustness, and security.

2) What are the new features introduced in Java 1.8?

Some of the new features introduced in Java 1.8 include Lambda expressions, Stream API, Date and Time API, default and static methods in interfaces, and the Nashorn JavaScript engine.

3) What is the purpose of Lambda expressions in Java 1.8?

Lambda expressions provide a way to write more concise and readable code by enabling functional programming in Java. It allows developers to treat functionality as a method argument, creating more flexible and efficient code.

4) How does the Stream API in Java 1.8 improve performance?

The Stream API in Java 1.8 allows for parallel processing of data, making use of multi-core processors and improving performance in comparison to traditional methods of iteration.

5) What is the Date and Time API in Java 1.8 used for?

The Date and Time API in Java 1.8 provides a more comprehensive and flexible set of date and time-related functionalities, making it easier to work with date and time values in Java applications.

6) How do default methods in interfaces differ from regular methods?

Default methods in interfaces provide a default implementation, making it possible to add new methods to existing interfaces without breaking compatibility with existing implementations. Regular methods in interfaces must be implemented by the implementing class.

7) What is the Nashorn JavaScript engine in Java 1.8 used for?

The Nashorn JavaScript engine allows for the execution of JavaScript code within Java applications, making it easier to integrate JavaScript with Java code and simplifying development of web applications.

8) What is the difference between a functional interface and a regular interface?

A functional interface is an interface that has only one abstract method and can be used as a target for lambda expressions. A regular interface can have multiple abstract and non-abstract methods.

9) How is type inference used in Java 1.8?

Type inference in Java 1.8 allows developers to omit the type declaration when creating an object, as the compiler can infer the type from the context.

10) What is the diamond problem in Java and how is it solved in Java 1.8?

The diamond problem occurs when a class inherits from two or more classes that have the same method name and signature. In Java 1.8, this problem is solved by using default methods in interfaces, allowing for the implementation of the same method with different default behavior in each interface.

11) What is the purpose of the Optional class in Java 1.8?

The Optional class in Java 1.8 is used to handle null values and prevent NullPointerException while accessing an object.

12) How does Java 1.8 handle exceptions in lambda expressions?

In Java 1.8, the handling of exceptions in lambda expressions is done through try-catch blocks or by using the built-in interface ‘Consumer’, which has the ability to throw exceptions.

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13) What is the purpose of the Collectors class in Java 1.8?

The Collectors class in Java 1.8 provides a set of static methods that are used for generating different types of collections, making it easier to collect data from streams.

14) How does Java 1.8 improve security?

Java 1.8 introduces security enhancements such as the ability to limit the set of ciphers and algorithms used for secure communication, stronger password-based encryption, and improvements in the JVM security architecture.

15) What is multi-release JAR functionality in Java 1.8?

Multi-release JAR functionality in Java 1.8 allows for the creation of a single JAR file that contains different versions of classes for different Java versions, making it easier to maintain backward compatibility.

 

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