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