Multithreading is a feature in Java that allows concurrent execution of two or more threads for maximum utilization of the CPU.
What is a thread in Java?
A thread is a lightweight subprocess, the smallest unit of processing, in Java, managed by the Java thread model.
How do you create a thread in Java?
A thread in Java can be created by implementing the Runnable interface or by extending the Thread class.
What is synchronization in Java?
Synchronization is a mechanism in Java used to control access to shared resources by multiple threads to prevent data inconsistency.
What is Java Collection Framework?
The Java Collection Framework provides architecture to store and manipulate a group of objects in Java, with interfaces like List, Set, and Map.
What is the difference between ArrayList and LinkedList in Java?
ArrayList is based on a dynamic array for quick access, while LinkedList is based on a doubly linked list, better for insertions and deletions.
What is a lambda expression in Java?
A lambda expression is used to provide implementation of a method defined by a functional interface, often used to express instances of single-method interfaces.
What is Java Stream API?
Java Stream API is used to process collections of objects in a functional approach, providing methods to perform operations like filter, map, and reduce.
What is meant by Generics in Java?
Generics allow Java developers to create classes, interfaces, and methods with a placeholder for types they operate on, providing type safety and reducing bugs.
What is an exception hierarchy in Java?
Exception hierarchy defines classes of exceptions, with Throwable at the top, dividing into Error (unrecoverable) and Exception (recoverable), further into checked and unchecked.
How does garbage collection work in Java?
Garbage collection in Java automatically deletes unused or unreferenced objects from memory to manage resources efficiently.
What are annotations in Java?
Annotations provide metadata for Java code, often used for information like compiler instructions, runtime processing, and deployment instructions.
What is an enum in Java?
An enum is a special Java type used to define collections of constants, improving type safety.
What is a new feature introduced in Java 9?
Java 9 introduced modularity, allowing a module system to manage dependencies and encapsulate code better.
What is a package in Java?
A package is a namespace that organizes a set of related classes and interfaces, preventing naming conflicts and managing access.