Java
Core Java tutorials — OOP, collections, exceptions, multithreading and the APIs behind enterprise applications.
Java has quietly run the enterprise world for decades, and it's still everywhere — banking systems, Android's roots, and a big share of college and company tech stacks. Learn it well and you have a skill that stays in demand.
This hub covers the full journey. Get set up with the JDK, then move through variables & data types, control flow and arrays into the heart of Java — OOP, classes & objects, inheritance, polymorphism and interfaces. Then the practical power tools: collections, exception handling, multithreading, and JDBC for talking to databases.
We teach on a current JDK 25 LTS base using modern Java — var, records, switch expressions — not the dated style (and definitely not applets) that many tutorials still show. So you read and write Java the way today's teams actually do.
Want it structured? Join the waitlist for our Java course in Jalgaon, then level up with Advanced Java.
Arrays in Java
Store many values of one type with Java arrays: declaring, initializing, indexing, iterating, multidimensional arrays, and the Arrays helper class.
3 min readClasses & Objects in Java
Define classes with fields and methods, create objects with new, use the this keyword, and understand instance vs static members in Java.
4 min readThe Java Collections Framework
Use the Java Collections Framework — List, Set, and Map with ArrayList and HashMap — plus generics and iteration, to store flexible groups of objects.
3 min readConstructors & Overloading
Initialise objects properly with Java constructors — default and parameterized — and reduce duplication with constructor and method overloading.
3 min readControl Flow in Java
Direct your program's path with if/else, modern switch expressions, and the three loop forms, plus break and continue, using clear examples.
3 min readException Handling in Java
Handle runtime errors gracefully in Java with try-catch-finally, understand checked vs unchecked exceptions, throw your own, and use try-with-resources.
3 min readFile I/O in Java
Read and write files in Java using the modern Files and Path API, handle IOException safely, and stream large files efficiently with try-with-resources.
3 min readInheritance in Java
Reuse and extend classes with Java inheritance: the extends keyword, the super reference, method overriding, and how constructors chain to the parent.
3 min readInterfaces & Abstract Classes
Define contracts with Java interfaces and partial blueprints with abstract classes, learn default methods, and know when to choose each.
3 min readJDBC: Connecting Java to a Database
Connect Java to a database with JDBC: get a Connection, run safe queries with PreparedStatement, read results from a ResultSet, and use try-with-resources.
3 min readInstall Java & Set Up the JDK
Install the JDK 25 LTS, configure JAVA_HOME, verify your setup, and compile and run your first Java program from the command line.
4 min readMultithreading in Java
Run work concurrently in Java: create threads with Runnable, understand the thread lifecycle, prevent race conditions with synchronization, and use ExecutorService.
3 min readOOP in Java
Learn the four pillars of object-oriented programming in Java — encapsulation, inheritance, polymorphism, and abstraction — and why Java is OOP-first.
4 min readOperators in Java
Master Java operators: arithmetic, relational, logical, assignment, bitwise, and the ternary operator, plus precedence rules and short-circuit evaluation.
4 min readPackages & Access Modifiers
Organize Java code into packages and control visibility with the four access modifiers — public, protected, default, and private — using clear examples.
3 min readPolymorphism in Java
Learn polymorphism in Java: compile-time overloading versus runtime overriding, dynamic dispatch, upcasting, and modern pattern-matching switch.
3 min read15 Java Programs for Beginners
Fifteen short, fully commented Java programs for beginners — from even/odd to Fibonacci and prime checks — to practise variables, loops, and methods.
6 min readString Handling in Java
Work with text in Java: String immutability, essential methods, comparing with equals, efficient building with StringBuilder, and text blocks.
3 min readVariables & Data Types in Java
Understand how Java stores data: the eight primitive types, reference types, literals, and modern var type inference, with examples you can run.
4 min read
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