Java Interview Questions For 8 Years Experience
Advanced Java Interview Questions for Experienced Professionals
Java Interview Questions For 8 Years Experience
For a candidate with 8 years of experience in Java, interview questions may focus on in-depth knowledge and expertise in core Java concepts such as multithreading, collections, exception handling, design patterns, and Java EE technologies. Expect questions related to Java memory management, performance optimization, JVM internals, and problem-solving skills. Candidates may also be assessed on their experience in working with frameworks like Spring, Hibernate, or other Java technologies, as well as their ability to design scalable and efficient solutions. Attention may also be given to their familiarity with modern development practices like microservices architecture, cloud-native development, and agile methodologies. Additionally, communication skills and the ability to effectively articulate solutions and discuss technical concepts may also be evaluated during the interview process.
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1 - Explain the difference between an abstract class and an interface.
Abstract classes in Java can have both abstract and non abstract methods, while an interface can only have abstract methods. A class can implement multiple interfaces, but it can extend only one abstract class. Abstract classes can have constructors, while interfaces cannot.
2) What is the difference between the “equals” method and the “==” operator?
The “equals” method is used to compare the contents of two objects, while the “==” operator is used to compare the references of two objects. When the “equals” method is not overridden, it behaves the same way as the “==” operator.
3) What is the purpose of the “transient” keyword in Java?
The “transient” keyword is used in serialization to indicate that a variable should not be serialized. When an object is serialized, transient variables are not included in the process.
4) How does exception handling work in Java?
Exception handling in Java is done using try, catch, and finally blocks. Code that may throw an exception is placed inside the try block, and if an exception is thrown, it is caught in the catch block. The finally block is used to execute code that should always run, regardless of whether an exception occurred.
5) Explain the difference between the “final,” “finally,” and “finalize” in Java.
“final” is a keyword used to restrict the user from changing the value of a variable, method, or class. “finally” is a block used in exception handling to clean up resources or ensure code is executed, regardless of an exception. “finalize” is a method used for cleanup operations before an object is garbage collected.
6) How does Java handle multithreading?
Java provides built in support for multithreading through the Thread class and Runnable interface. Developers can create and start multiple threads to execute tasks concurrently. Synchronization mechanisms such as synchronized blocks and locks are used to prevent race conditions and ensure thread safety.
7) What is the difference between the “sleep()” and “wait()” methods in Java?
The “sleep()” method is used to pause the execution of a thread for a specified amount of time, while the “wait()” method is used for inter thread communication. “wait()” is called on an object to relinquish the lock and wait for another thread to invoke notify() or notifyAll() on the same object.
8) Explain the concept of garbage collection in Java.
Garbage collection in Java is the process of automatically reclaiming memory occupied by objects that are no longer reachable or in use by the program. The JVM runs a garbage collector periodically to identify and reclaim memory from unused objects, preventing memory leaks and managing memory efficiently.
9) How does Java support polymorphism?
Java supports polymorphism through method overloading and overriding. Method overloading allows multiple methods with the same name but different parameters in a class, while method overriding involves defining a method in a subclass with the same name, return type, and parameters as a method in its superclass.
10) What are the key features of Java 8?
Java 8 introduced several new features, including lambda expressions, functional interfaces, the Stream API for processing collections, default methods in interfaces, and the java.time package for date and time manipulation. These features aimed to enhance code readability, maintainability, and performance in Java applications.
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