Java tutorials

What is the difference between JDK, JRE, and JVM?

Understanding the Java Development Kit (JDK), Java Runtime Environment (JRE), and Java Virtual Machine (JVM) is fundamental to grasping how Java programs are executed. These three components work...

Java tutorials Core Java Fundamentals

Difference between checked and unchecked exceptions?

In Java, exceptions are categorized into two main types: checked exceptions and unchecked exceptions. Understanding the difference between them is crucial for effective error handling and writing...

Java tutorials Core Java Fundamentals

How to serialize and deserialize objects?

Serialization and deserialization are fundamental concepts in Java that allow you to convert objects into a stream of bytes for storage or transmission and then reconstruct them later. This tutorial...

Java tutorials Input/Output (I/O) and Networking

What are the main interfaces in the Collections Framework?

The Java Collections Framework provides a unified architecture for representing and manipulating collections of objects. It's built around a set of interfaces and classes, with interfaces defining the...

Java tutorials Core Java Fundamentals

What is the architecture of the JVM?

The Java Virtual Machine (JVM) is the cornerstone of the Java platform. It's responsible for executing Java bytecode, providing a runtime environment, and enabling Java's platform independence ('write...

Java tutorials Java Virtual Machine (JVM)

How to perform integration testing?

Integration testing is a crucial phase in software development that focuses on verifying the interaction between different modules or components of a system. Unlike unit testing, which tests...

Java tutorials Testing and Debugging

How to add dependencies (Maven, Gradle)?

Adding dependencies to your Java project using build tools like Maven and Gradle is fundamental to leveraging external libraries and frameworks. This tutorial provides a comprehensive guide on how to...

Java tutorials Frameworks and Libraries

How to implement client-server communication?

This tutorial demonstrates how to implement basic client-server communication using Java's Socket API. We will cover setting up a server socket to listen for client connections and a client socket to...

Java tutorials Input/Output (I/O) and Networking

What are the four pillars of OOP?

OOP, or Object-Oriented Programming, is a programming paradigm centered around 'objects' that contain data (attributes) and code to manipulate that data (methods). The power and flexibility of OOP...

Java tutorials Core Java Fundamentals

What is local-variable type inference (`var` in Java 10)?

Java 10 introduced local-variable type inference, allowing you to declare variables using the var keyword when the type can be inferred from the initializer. This simplifies code by reducing verbosity...

Java tutorials Modern Java Features

How to test exceptions?

Testing for exceptions in Java is a crucial aspect of ensuring your code's robustness and reliability. It involves verifying that your code throws the expected exceptions under specific conditions....

Java tutorials Testing and Debugging

How to step through code?

Stepping through code is a fundamental debugging technique that allows you to execute a program line by line, observing the values of variables and the flow of control. This is invaluable for...

Java tutorials Testing and Debugging

How does Java achieve platform independence?

Java achieves platform independence through the use of the Java Virtual Machine (JVM). Instead of compiling Java code directly into machine code for a specific operating system, it's compiled into an...

Java tutorials Core Java Fundamentals

What is garbage collection?

Garbage collection is an automatic memory management process that reclaims memory occupied by objects that are no longer in use by a program. In Java, the JVM's garbage collector automatically manages...

Java tutorials Java Virtual Machine (JVM)

What are JVM options and how to configure?

Understanding and Configuring JVM Options JVM (Java Virtual Machine) options are command-line arguments used to configure the behavior of the JVM when running a Java application. These options control...

Java tutorials Java Virtual Machine (JVM)

How do you define methods and constructors?

This tutorial explains how to define methods and constructors in Java. Methods are blocks of code that perform specific tasks, while constructors are special methods used to initialize objects....

Java tutorials Core Java Fundamentals

What is `Optional` and why use it?

Understanding and Using Java's `Optional` Class The `Optional` class in Java is a container object that may or may not contain a non-null value. It was introduced in Java 8 to address the common...

Java tutorials Modern Java Features

How to write effective test cases?

Writing effective test cases is crucial for ensuring the quality and reliability of your Java code. This tutorial explores how to craft test cases that thoroughly validate your code's functionality,...

Java tutorials Testing and Debugging

What are locks and monitors?

In concurrent programming, locks and monitors are fundamental synchronization primitives used to manage access to shared resources by multiple threads. They prevent race conditions and ensure data...

Java tutorials Multithreading and Concurrency

What are the implementations of `Set` (HashSet, TreeSet, LinkedHashSet)?

This tutorial explains the different implementations of the `Set` interface in Java: `HashSet`, `TreeSet`, and `LinkedHashSet`. It covers their unique characteristics, performance implications, and...

Java tutorials Core Java Fundamentals

How is inheritance implemented using `extends`?

Inheritance is a fundamental concept in Object-Oriented Programming (OOP) that allows a class to inherit properties and behaviors from another class. In Java, inheritance is implemented using the...

Java tutorials Core Java Fundamentals

How to configure Spring applications?

Configuring Spring Applications This tutorial explores various methods for configuring Spring applications, from XML-based configuration to annotation-based and Java-based configuration. We'll cover...

Java tutorials Frameworks and Libraries

Benefits of using frameworks?

Understanding the Advantages of Using Frameworks in Java Development Frameworks are essential tools in modern Java development. They provide a pre-built structure and set of tools to streamline the...

Java tutorials Frameworks and Libraries

How to use breakpoints?

Breakpoints are essential tools for debugging in Java and other programming languages. They allow you to pause the execution of your code at specific lines, inspect variables, and step through the...

Java tutorials Testing and Debugging

Difference between `wait()`, `notify()`, `notifyAll()`?

In Java multithreading, wait(), notify(), and notifyAll() are essential methods for thread synchronization and communication. They enable threads to coordinate their actions by pausing execution...

Java tutorials Multithreading and Concurrency

How to work with URLs?

Working with URLs in Java This tutorial explores how to work with URLs in Java, covering URL creation, reading data from URLs, and handling exceptions. URLs (Uniform Resource Locators) are fundamental...

Java tutorials Input/Output (I/O) and Networking

What are sealed classes (Java 17)?

Sealed classes, introduced in Java 17, offer a powerful way to control the inheritance hierarchy of a class or interface. They allow you to explicitly define which classes are permitted to extend or...

Java tutorials Modern Java Features

How to use `try`, `catch`, `finally`?

Exception handling is a crucial aspect of robust Java programming. The try, catch, and finally blocks are fundamental tools for managing exceptions and ensuring that your program behaves predictably,...

Java tutorials Core Java Fundamentals

What is the Stream API and how to use it?

Introduction to the Stream API The Stream API, introduced in Java 8, provides a powerful and efficient way to process collections of data. It allows you to perform complex operations on data in a...

Java tutorials Modern Java Features

Difference between `Error` and `Exception`?

Understanding Errors and Exceptions in Java In Java, both Error and Exception are subclasses of the Throwable class, representing abnormal conditions that disrupt the normal flow of program execution....

Java tutorials Core Java Fundamentals