Overflow and Underflow in Java
1. Introduction In this tutorial, we’ll look at the overflow and underflow of numerical data types in Java. We won’t dive deeper into the more […]
JAVA
Validations for Enum Types
1. Introduction In the tutorial Java Bean Validation Basics, we saw how we can apply javax validations using JSR 380 to various types. And in the tutorial Spring MVC Custom Validation, […]
Checked and Unchecked Exceptions in Java
1. Overview Java exceptions fall into two main categories: checked exceptions and unchecked exceptions. In this article, we’ll provide some code samples on how to use them. […]
The XOR Operator in Java
1. Overview In this short tutorial, we’re going to learn about the Java XOR operator. We’ll go through a bit of theory about XOR operations, and then we’ll see […]
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 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 […]
