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Evaluation of Methods References in Java 1. Overview Java 8 introduced the concept of method references. We often see them as similar to lambda expressions. However, method references and lambda expressions are not exactly the same thing. In this article, we’ll show why they are different and what are the… Continue Reading java-methods-references-eval

Exception Handling in Java 1. Overview In this tutorial, we’ll go through the basics of exception handling in Java as well as some of its gotchas. 2. First Principles ==== 2.1. What is it? To better understand exceptions and exception handling, let’s make a real-life comparison. Imagine that we order… Continue Reading java-exceptions

Attaching Values to Java Enum 1. Introduction The Java enum type provides a language-supported way to create and use constant values. By defining a finite set of values, the enum is more type-safe than constant literal variables like String or int. However, enum values are required to be valid identifiers,… Continue Reading java-enum-values

Infinite Loops in Java 1. Overview In this quick tutorial, we’ll explore ways to create an infinite loop in Java. Simply put, an infinite loop is an instruction sequence that loops endlessly when a terminating condition isn’t met. Creating an infinite loop might be a programming error, but may also… Continue Reading infinite-loops-java

Quick Guide to java.lang.System 1. Overview In this tutorial, we’ll take a quick look at the java.lang.System class and its features and core functionality. 2. IO System is a part of java.lang, and one of its main features is to give us access to the standard I/O streams. Simply put,… Continue Reading java-lang-system

Java instanceof Operator 1. Introduction In this quick tutorial, we’ll learn about the instanceof operator in Java. 2. What is the instanceof Operator? instanceof is a binary operator used to test if an object is of a given type. The result of the operation is either true or false. It’s also known as type comparison operator because it… Continue Reading java-instanceof

How to Check if Java is Installed 1. Overview In this short tutorial, we’re going to take a look at a few ways to determine if Java is installed on a machine. 2. Command Line First, let’s open a command window or terminal and enter: > java -version If Java… Continue Reading java-check-is-installed

Method Overloading and Overriding in Java 1. Overview Method overloading and overriding are key concepts of the Java programming language, and as such, they deserve an in-depth look. In this article, we’ll learn the basics of these concepts and see in what situations they can be useful. 2. Method Overloading… Continue Reading java-method-overload-override

Java @SafeVarargs Annotation 1. Overview In this quick tutorial, we’ll have a look at the @SafeVarargs annotation. 2. The @SafeVarargs Annotation Java 5 introduced the concept of varargs, or a method parameter of variable length, as well as parameterized types. Combining these can cause problems for us: public static <T> T[] unsafe(T…… Continue Reading java-safevarargs

Java main() Method Explained 1. Overview Every program needs a place to start its execution; talking about Java programs, that’s the main method. We’re so used to writing the main method during our code sessions, that we don’t even pay attention to its details. In this quick article, we’ll analyze… Continue Reading java-main-method