Tech Tutorials

Arrays in Java are fundamental data structures used to store elements of the same type sequentially in memory. They provide a convenient way to manage collections of data where each element is accessed by its index. Basics of Arrays An array in Java is a fixed-size container that holds a specific number of elements of the same data type. This means all elements in an array must be of the same type such as integers ( int ), floating-point numbers ( double ), characters ( char ) or objects ( Object ). Declaring and Initializing Arrays To declare an array in Java we specify the type of elements followed by square brackets  []  and the array name: dataType[] arrayName; For example, to declare an integer array named  numbers : int[] numbers; Arrays in Java are objects and like all objects they must be instantiated with the  new  keyword before they can be used: arrayName = new dataType[arraySize]; For instance, to create an integer array  numbers  with a si...

The Variables are essential components of any programming language including Java. They are used to store and manipulate data within a program. In this article, we'll explore everything you need to know about variables in Java including their types, declaration, initialization, scope and best practices for usage. Introduction to Variables In Java, a variable is a named memory location used to store data. The Variables provide a way to label and refer to values within a program. They can hold various types of data such as numbers, characters and objects. Types of Variables Java supports several types of variables classified into two main categories: 1. Primitive Variables: The Primitive variables store simple data types such as integers, floating-point numbers, characters and boolean values. Examples: int, double, char, boolean. 2. Reference Variables: The Reference variables store references to objects in memory. Examples: String, ArrayList, Object. Declaration and Initialization T...