Tricky Java Interview Questions For 7 Years Experience
7 Years Experienced Java Interview: Challenging Questions to Test Your Skills
Tricky Java Interview Questions For 7 Years Experience
For a candidate with 7 years of experience in Java, tricky interview questions may cover advanced topics like multithreading, design patterns, Java virtual machine (JVM) internals, and performance optimization. Expect questions on topics such as synchronized vs. volatile keyword usage, deadlocks, ConcurrentHashMap, Singleton pattern implementation, Observer pattern, Garbage Collection, memory management, and tuning Java applications for better performance. Be prepared to discuss Java 8 features like lambda expressions, streams, and functional interfaces. Additionally, knowledge of popular frameworks like Spring and Hibernate, as well as experience with distributed systems and microservices architecture, may also be tested. Stay sharp by practicing coding exercises, reviewing core Java concepts, and familiarizing yourself with the latest industry trends to ace the interview.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - What is the difference between abstract class and interface in Java?
Abstract class is a class with at least one abstract method that must be extended by a subclass, while an interface is a reference type similar to a class that can contain only static constants, method signatures, and nested types. Interfaces support multiple inheritance while abstract classes do not. Abstract classes can have non abstract methods and fields, while all methods in an interface are implicitly abstract and public.
2) Explain the concept of serialization in Java.
Serialization is the process of converting an object into a stream of bytes so that it can be easily saved to a file or transferred over a network. This serialized form can then be deserialized back into an object when needed. It is commonly used in scenarios such as storing object state for future use, deep copying objects, or transferring objects between different applications.
3) What is a thread safe class in Java?
A thread safe class in Java is one that can be safely used by multiple threads at the same time without the risk of data corruption or race conditions. This can be achieved by using synchronization mechanisms such as synchronized blocks or using concurrent data structures provided by the Java.util.concurrent package. Making a class thread safe ensures that its methods can be accessed and modified concurrently without any issues.
4) Describe the difference between composition and inheritance in Java.
Inheritance is a mechanism where a new class inherits properties and behavior from an existing class. This promotes code reusability but can lead to tight coupling and inflexible design. Composition, on the other hand, involves creating a new class that contains instances of other classes as members. This promotes loosely coupled designs, better flexibility, and is favored in many cases over inheritance.
5) What is the purpose of the ‘finalize’ method in Java?
The ‘finalize’ method in Java is used for cleanup operations before an object is garbage collected. However, it is not recommended to rely on this method for critical resource cleanup as it may not always be called by the JVM. It is more of a hint to the JVM that the object is no longer needed, but the actual cleanup should be managed explicitly using other mechanisms like try with resources or implementing the AutoCloseable interface.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
Contact Us for more info:
- Message us on Whatsapp: +91 9987184296
- Email id: info@justacademy.co
Javascript Logical Interview Questions
Java Hibernate Interview Questions
Mobile App Testing Interview Questions
Manual Testing Interview Question And Answer For Fresher
