java

Welcome to this tutorial on how to compile and run your first Java program. Java is a versatile and widely used programming language, known for its portability and platform independence. Whether you are new to programming or have experience with other languages, this tutorial will provide you with a step-by-step guide to writing and executing…

Read More Your First Java Program: A Guide to Compiling and Running It Successfully

If you’re new to Java programming or just starting out, it can be a bit overwhelming to know where to begin. That’s why I’ve put together this guide to help you get set up with everything you need to start developing Java applications. In this tutorial, I’ll walk you through the steps of downloading and…

Read More Setting up Java Development Environment: A Complete Guide

Operator Description Example + Indicates positive value +a – Negates an expression value (Converts positive number to negative) -a ++ Increments a value by 1 ++a — Decrements a value by 1 –a ! Inverts the value of a boolean type !true gives false %= Assigns the remainder to the left operand when dividing the…

Read More Java operators

Java is a programming language that is widely known for its versatility, power, and many features. It is popular among developers due to its object-oriented design, portability, and strong security. Java’s object-oriented design allows developers to organize their code into modular units, making it easier to build large-scale applications. Java’s portability means that code can…

Read More Java’s Powerful Features: A Comprehensive Guide

Java main method is the entry point of any Java program. It’s the method that the Java Virtual Machine (JVM) calls to execute the program. In this tutorial, we’ll explore what the main method is, how it’s executed, and what the valid Java main method signatures are. We’ll also discuss some best practices for writing…

Read More Java Main Method: A Comprehensive Guide

class Vehicle { int maxSpeed = 250; public void printMaxSpeed() { System.out.println(“Max speed: ” + maxSpeed); } } class Car extends Vehicle { int maxSpeed = 300; @Override public void printMaxSpeed() { System.out.println(“Max speed: ” + maxSpeed); } } class Test { public static void main(String[] args) { Vehicle vehicle = new Car(); // upcasting…

Read More Upcasting Vs Downcasting in Java

String validation plays a crucial role in Java programming as it helps ensure the correctness and reliability of data processing. Strings are fundamental data types used to store text-based information, such as user inputs, file contents, or database values. However, these strings can often be empty, null, or contain only whitespace characters, which can lead…

Read More Check if a String is Null, Empty or Blank in Java

{ “firstName” : “John”, “lastName”: “Doe”, “gender”: “Male”, “state”: “Texas” } public class Person { private String firstName; private String lastName; private String state; // constructors, getters and setters } public class Person { private String firstName; private String lastName; private String gender; <<<< private String state; } import com.fasterxml.jackson.annotation.JsonIgnoreProperties; @JsonIgnoreProperties(ignoreUnknown = true) public class…

Read More Unrecognized field not marked as ignorable – Java Jackson