class Test { public static void main(String[] args) { String str = “alegru”; char c = str.charAt(2); System.out.println(c); } } Output: e class Test { public static void main(String[] args) { String str = “alegru”; int index = str.indexOf(‘l’); System.out.println(index); } } Output: 1 class Test { public static void main(String[] args) { String str…
Read More Working With Strings in Java – Part 1Java Strings are one of the most commonly used data types in Java programming, and understanding how to work with them effectively is essential for any Java developer. In this tutorial, I will cover everything you need to know about Java Strings, from the basics of creating and manipulating Strings to advanced concepts like regular…
Read More Mastering Java String: A Comprehensive Tutorialimport java.util.Arrays; class Test { public static void main(String[] args) { String[] names = {“John”, “Steve”, “Melissa”, “Maria”}; System.out.println(Arrays.toString(names)); } } Output: [John, Steve, Melissa, Maria] copyOf(type [] a, int n) Returns a new copy of the array, which consists of the first n of its elements. import java.util.Arrays; class Test { public static…
Read More Arrays class in JavaDeclaring a multidimensional array in Java class Test { int[][] array1; int[][] array2; int array3[][]; } class Test { int[][] array1 = new int[3][3]; // 3 rows and 3 columns int[][] array2 = {{1, 2}, {3, 4}}; // 2 rows and 2 columns } class Test { public static void main(String[] args) { int[][] array…
Read More Multidimensional Arrays in Javaclass Test { int[] a; int b[]; int []c; } class Test { int[] a = new int[100]; int b[] = new int[]{1, 2, 3}; int[] c = {1, 2, 3}; } class Test { public static void main(String[] args) { // initialize the array int[] a = new int[3]; // add elements to array…
Read More Java ArraysJava is a popular object-oriented programming language used to build robust, scalable, and maintainable applications. One of the key features of Java is its support for method overloading and method overriding, which allows developers to write more efficient and flexible code. Method overloading and method overriding are two important concepts in Java that are often…
Read More Method Overloading vs Method Overriding in JavaIn Java, a class is a blueprint or a template that defines the properties and behaviours of objects. An object, on the other hand, is an instance of a class, created using the blueprint provided by the class. To illustrate this concept, let’s consider an example of a car. A car can be thought of…
Read More Object vs Class in Java: A Beginner’s GuideEncapsulation is a fundamental concept in object-oriented programming (OOP) that involves bundling data and behaviour together into a single unit, called a class. The key idea behind encapsulation is to protect the data within a class from being accessed or modified directly by code outside the class. Instead, the class provides methods or functions to…
Read More Encapsulation in Java Made Easy: Mastering OOP Principlespackage vehicle; public class Car { // fields and methods } package vehicle; // OK public class Car { package vehicle; // DOES NOT COMPILE // fields and methods } package vehicle; // DOES NOT COMPILE package vehicle; class Car { public void printRandomNumber() { Random r = new Random(); // DOES NOT COMPILE System.out.println(r.nextInt(10));…
Read More Java PackagesIn this tutorial, we will explore the differences between interfaces and abstract classes and when to use each of them. We’ll start with a brief overview of what these two approaches are, and then dive into their characteristics, syntax, and usage in Java. By the end of this tutorial, you will have a solid understanding…
Read More Interfaces VS Abstract Classes in Java: Exploring the Powerful DistinctionsIn Java, an interface is a collection of abstract methods that define a contract or a set of behaviors that a class can implement. Interfaces provide a way to achieve abstraction and polymorphism, enabling objects of different classes to be treated interchangeably based on their common behavior. In this tutorial, we will explore the various…
Read More Java Interfaces: Everything You Need to KnowAbstraction is the process of hiding implementation details and presenting only the essential features to the user. This allows us to focus on what an object is doing rather than how it is doing it. In Java, abstract classes and methods are key tools for implementing abstraction. Abstract classes serve as templates for creating subclasses,…
Read More Abstract Classes and Methods in Java: Explained!class Vehicle { // … } class Car extends Vehicle { // … } class Test { public static void main(String[] args){ Car car = new Car(); System.out.println(car instanceof Car); System.out.println(car instanceof Vehicle); } } Output: true true The above example shows that an object of subclass type is also a superclass type. The instanceof operator works…
Read More Java instanceof OperatorJava is an object-oriented programming language that allows developers to create reusable and modular code through the use of classes, objects, and interfaces. One of the key features of Java is the concept of binding, which refers to the association of a method call to the corresponding method body. There are two types of binding…
Read More Static and Dynamic Binding in Java: A Complete Guide