Command-Line Arguments in Java
1. Introduction It’s quite common to run applications from the command-line using arguments. Especially on the server-side. Usually, we don’t want the application to do the […]
Java
Java Copy Constructor
1. Introduction A copy constructor in a Java class is a constructor that creates an object using another object of the same Java class. That’s helpful when we […]
Comparing Dates in Java
1. Introduction In this tutorial, we’ll focus on how to compare dates using the Java 8 Date/Time API. We’ll dive into different methods to check whether […]
Convert Time to Milliseconds in Java
1. Overview In this quick tutorial, we’ll illustrate multiple ways of converting time into Unix-epoch milliseconds in Java. More specifically, we’ll use: Core Java’s java.util.Date and Calendar Java 8’s […]
Anonymous Classes in Java
1. Introduction In this tutorial, we’ll consider anonymous classes in Java. We’ll describe how we can declare and create instances of them. We’ll also briefly […]
Java toString() Method
1. Overview Every class in Java is a child of the Object class either directly or indirectly. And since the Object class contains a toString() method, we can call toString() on any instance and […]
Java Switch Statement
1. Overview In this tutorial, we’ll learn what the switch statement is and how to use it. The switch statement allows us to replace several nested if-else constructs and thus improve […]
The Modulo Operator in Java
1. Overview In this short tutorial, we’re going to show what the modulo operator is, and how we can use it with Java for some […]
Why String is Immutable in Java?
1. Introduction In Java, Strings are immutable. An obvious question that is quite prevalent in interviews is “Why Strings are designed as immutable in Java?” […]
Immutable Objects in Java
1. Overview In this tutorial, we’ll learn what makes an object immutable, how to achieve immutability in Java, and what advantages come with doing so. […]
Create a Custom Exception in Java
1. Overview In this tutorial, we’ll cover how to create a custom exception in Java. We’ll show how user-defined exceptions are implemented and used for both […]
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 […]
The “final” Keyword in Java
1. Overview While inheritance enables us to reuse existing code, sometimes we do need to set limitations on extensibility for various reasons; the final keyword allows us to do […]
RegEx for matching Date Pattern in Java
1. Introduction Regular expressions are a powerful tool for matching various kinds of patterns when used appropriately. In this article, we’ll use java.util.regex package to determine whether […]
Period and Duration in Java
1. Overview In this quick tutorial, we’re going to take a look at two new classes for working with dates introduced in Java 8: Period and Duration. Both […]
Converting a Stack Trace to a String in Java
1. Introduction When dealing with exceptions in Java, we’re frequently logging or simply displaying stack traces. However, sometimes, we don’t want just to print the […]
The StackOverflowError in Java
1. Overview StackOverflowError can be annoying for Java developers, as it’s one of the most common runtime errors we can encounter. In this article, we’ll see […]
Iterating over Enum Values in Java
1. Overview Enum in Java is a datatype that helps us assign a predefined set of constants to a variable. In this quick article, we’ll see […]
Guide to UUID in Java
1. Overview UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier) represents a 128-bit long value that is unique for all practical purposes. The standard representation […]
How to Round a Number to N Decimal Places in Java
1. Overview In this short tutorial, we’ll learn how to round a number to n decimal places in Java. 2. Decimal Numbers in Java Java provides two […]
