Core Java Interview Questions For 10 Years Experience


Core Java Interview Questions For 10 Years Experience

Advanced Java Interview Questions for Professionals with 10 Years Experience

Core Java Interview Questions For 10 Years Experience

For a candidate with 10 years of experience in Core Java, interview questions may focus on advanced concepts such as multi-threading, design patterns, data structures, algorithms, Java 8 features like lambda expressions and streams, memory management, exception handling, and Java Virtual Machine (JVM) internals. Employers may also inquire about the candidate's experience in developing scalable and high-performance applications, their knowledge of Java best practices and coding standards, debugging skills, and experience with frameworks like Spring, Hibernate, or JEE. Additionally, questions related to system design, database interaction, performance tuning, and debugging complex issues in production environments may be asked to assess the candidate's ability to handle challenges efficiently and effectively.

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1 - What is the difference between abstract class and interface in Java?

Abstract classes in Java can have both abstract and non abstract methods, while interfaces can only have abstract methods. Abstract classes can have constructors, member variables, and methods with access modifiers, whereas interfaces cannot have any implementations. An abstract class can implement interfaces, but one interface cannot inherit another interface like classes do.

2) Explain the concept of multithreading in Java.

Multithreading in Java allows concurrent execution of two or more parts of a program for maximum utilization of CPU. Each part is called a thread, and Java provides built in support for creating and managing threads. Threads help in improving the performance of the application by not blocking the user interface during resource intensive tasks.

3) What are the different types of ClassLoaders in Java?

There are three types of ClassLoaders in Java: Bootstrap ClassLoader, Extension ClassLoader, and System/Application ClassLoader. The Bootstrap ClassLoader loads core Java classes from the bootstrap classpath. The Extension ClassLoader loads classes from the extension directory. The System ClassLoader loads classes from the classpath specified by the CLASSPATH environment variable.

4) Discuss the principle of object cloning in Java.

Object cloning in Java refers to creating an exact copy of an object. This can be achieved using the `clone()` method provided by the `Cloneable` interface. When an object is cloned, a new object is created with the same state as the original object. However, it is important to note that shallow copying is performed by default, which means that only the object's references are copied.

5) How does exception handling work in Java?

Exception handling in Java uses the try catch finally blocks. The code that may throw an exception is placed inside the try block, and the corresponding exception types are caught in the catch blocks. The finally block is used to execute code that needs to be run regardless of whether an exception is thrown or not. Exceptions can be predefined (checked) or runtime (unchecked), and they help in gracefully handling errors in Java programs.


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