Online Java Compiler
Run Java code online for free to use, where you can write, run button, and share Java code. A user-friendly Java text editor supports standard libraries and takes users’ input. Joken E. Villanueva …
Java Tutorial
Java is the language that teaches object-oriented programming better than any other, strict typing, explicit class structures, mature ecosystem. It’s the backbone of enterprise software, Android apps, and countless BSIT capstones built with NetBeans or IntelliJ. This hub collects free Java tutorials from “hello world” through Swing GUIs, JavaFX, JDBC database integration, and Spring Boot REST APIs.
What you’ll learn in the Java tutorial series
Core syntax: variables, primitives, operators, control flow
Object-Oriented Programming: classes, objects, inheritance, polymorphism, encapsulation, abstraction
Collections framework: ArrayList, HashMap, HashSet, LinkedList, iterators
Exception handling: try/catch/finally, checked vs unchecked, custom exceptions
File I/O: reading/writing files, streams, NIO
JDBC: connecting to MySQL or SQL Server, prepared statements, transactions
GUI development: Swing (NetBeans), JavaFX (modern UI)
Modern Java: lambda expressions, streams, var, records, switch expressions
Spring Boot intro: REST APIs, dependency injection, JPA
Why Java for BSIT capstones
Java is preferred by BSIT/BSCS panels that emphasize OOP discipline: Java’s strict structure forces students to think about classes, inheritance, and encapsulation before writing code. It’s the dominant language for Android development (via NetBeans + Android Studio), enterprise systems (Spring Boot), and many desktop capstones (Swing + JDBC + MySQL). Performance is excellent, deployment is well-documented.
Recommended Java development setup
JDK 21 LTS (current stable Long-Term Support release)
NetBeans (most common for Philippine BSIT capstones) or IntelliJ IDEA Community (free, more modern)
Maven or Gradle for build tooling and dependency management
MySQL Connector/J for JDBC database connections
Git for version control (and GitHub for backup + showcasing)
JUnit for unit testing
Related Java resources
Java Projects, downloadable Java capstones
MySQL Projects, JDBC + MySQL integration
Android Projects, mobile capstones using Java
UML Diagrams, for OOP capstone documentation
Database Design, for ER diagrams in your Chapter 3
Scroll down to browse the full Java tutorial catalog ↓
What is Polymorphism in Java With Examples
What is Polymorphism in Java? A Polymorphism In Java, it means “many forms,” and it happens when we have a lot of classes that inherit from each other. As we …
How to Initialize a List in Java with Best Examples
In this tutorial, we will learn in Java how to initialize a list with the help of an example. A list is an organized set that allows us to save …
How to Call a Method in Java with Code Example
In this tutorial, we will learn how to call method in Java with the help of an example. Java is an object-oriented language, so its methods must be defined in …
How to Initialize an Array in Java with Example
In this tutorial, we will learn how to initialize array in Java with the help of an example. An array is a significant part of one of the major data …
How To Sort a List in Java with Advanced Example
In this tutorial, we will discuss the sort list in Java with the help of examples. We will also discuss how to use it in our own way to implement …
How to Read in a File in Java with Examples
In this tutorial, we will learn how to read from a file in Java and also learn the different ways of reading a file in Java. This is recommended when …
LCM Of Two Numbers In Java With Advanced Examples
This article is about the LCM of Two Numbers In Java, this is the smallest positive integer that can be perfectly divided by both numbers (without remainder). In addition, LCM …
GCD Of Two Numbers In Java with Advanced Examples
This article is about GCD Of Two Numbers In Java will teach you how to use Java to find the GCD of two numbers. This is done with the help …
Perfect Number In Java With Program Examples
In this article, we will learn about perfect number in Java. This article also has the best program examples to check whether the number is perfect or not. Any number …
Super Easy Way To Learn Everything About Java Networking
Introduction to Java Networking Java was the first programming language that was created from the start with networking. Java was originally made for private cable TV networks instead of the …
Master Java IO Serialization in 3 Minutes
What is serialization in Java? Serializing an object means converting it into a byte stream so that it can be copied. A Java object can be serialized if its class …
The Easiest Way To Learn Java Array Of Generic Classes
How can I simulate generic arrays in Java? In Java, you can’t directly define a generic array, which means you can’t assign a parameterized type to an array reference. But …
Frequently Asked Questions
Is Java still worth learning in 2026?
Yes — Java is still in the top 3 most-used programming languages globally and dominates enterprise software, Android development, and large-scale backend systems. For BSIT/BSCS capstones, Java with NetBeans or IntelliJ remains a top choice for OOP-focused panels. Modern Java (versions 17+) has lambdas, streams, records, and pattern matching — comparable to newer languages in expressiveness.
Which Java version should I use?
Use a Long-Term Support (LTS) release: JDK 21 (current LTS, recommended) or JDK 17 (still widely supported). Avoid old Java 8 unless required by legacy code — it lacks modern features. Get the JDK from OpenJDK (free, e.g., from Eclipse Temurin) — don't pay for Oracle JDK; the open-source builds are identical.
NetBeans, IntelliJ, or Eclipse — which IDE?
NetBeans — most common for Philippine BSIT capstones; great drag-and-drop Swing GUI builder, easy database wizards. IntelliJ IDEA Community Edition — free, more modern, better refactoring tools; industry standard for Java in 2026. Eclipse — older, still used in enterprise, less polished. For new capstones, IntelliJ Community is the best free choice. For panels that prefer the drag-and-drop GUI builder, stick with NetBeans.
How do I connect Java to a database?
Use JDBC (Java Database Connectivity). Steps: (1) Add the database driver JAR to your project (e.g., MySQL Connector/J for MySQL). (2) Open a
Connection with DriverManager.getConnection(url, user, pass). (3) Use PreparedStatement (NOT Statement) for queries — prevents SQL injection. (4) Process results with ResultSet. (5) Close resources in a finally block or use try-with-resources for automatic cleanup.What's the difference between Java SE, Java EE, and Spring Boot?
Java SE (Standard Edition) — the core language and standard library. This is what you learn first; sufficient for desktop apps and JDBC database apps. Java EE / Jakarta EE — enterprise specifications (Servlets, JPA, EJB) — older approach to web apps. Spring Boot — modern Java web framework that replaces Java EE for most use cases; simpler, faster, larger community. For 2026 capstones doing web work, use Spring Boot.
What can I build with Java for my capstone?
Common Philippine BSIT capstone domains using Java: Desktop CRUD apps (Swing/JavaFX + JDBC + MySQL) — Library, Hospital, School systems. Android mobile apps — booking, attendance, study aids. Spring Boot REST APIs — back-ends for React/Vue front-ends. Enterprise systems — Inventory, Payroll, ERP-style. Browse our Java Projects hub for downloadable examples.