Multi-threading in Java enables a single process to manage multiple threads concurrently, allowing tasks to be executed in parallel. This is achieved through the Thread class or the Runnable interface, empowering developers to create and oversee threads for parallel task execution.
In languages like C/C++, managing memory manually is a crucial task for programmers. Forgetting to deallocate memory can lead to memory leaks and program crashes due to insufficient memory. However, Java provides an automatic memory management system known as the Garbage Collector (GC), which handles memory deallocation for you.
Java access modifiers are fundamental to Java's object-oriented nature, providing various levels of encapsulation by controlling access to classes, fields, methods, and constructors. Understanding these is crucial for designing secure, well-structured, and maintainable Java applications. Here's a more detailed dive into each of the Java access modifiers:
Data types in Java specify the size, type, and operations of data that can be stored in a variable. In Java, a statically-typed language, every variable must be declared with a data type. The data type of a variable determines how much space it occupies in memory and what kind of operations can be performed on it.
This guide is a collection of resources to prepare for Java interviews.