Learn Java with hands-on examples - Completely from Scratch

Learn Java fundamentals by building a Hello world program, exploring classes, packages, and the main method, and printing output to the console using System.out.println.

Learn to run and compile a Java program from the command prompt by navigating folders, compiling the main class, and executing it to display output.

Learn how the Java garbage collector automatically reclaims memory in the JVM by tracking object references and expired objects. It also helps you monitor memory usage and minimize allocations.

Explore how switch statements in Java enable selecting among multiple options with practical examples. Learn to use a Scanner for user input and convert strings to numbers with Integer.parseInt.

Explore how the while loop in Java evaluates a condition and repeats actions until the condition becomes false, with hands-on guidance on controlling loop termination.

Learn how a do-while loop in Java executes its body first and then checks the condition, enabling repeated execution until the condition becomes false.

Learn function overloading in Java, where methods share a name but vary by signatures and arguments, with parameter counts determining which overloaded method runs and the resulting sums.

learn string parsing in Java by measuring string length, locating specific words with index, and removing spaces, while using a Scanner to read input and parse numbers from text.

Learn how to handle runtime exceptions in Java using try and catch blocks to catch errors, display messages, and keep the application running.

Explore Java arrays, learn zero-based indexing, declare and initialize arrays, access elements by index, determine array size, and print contents with loops.

Learn how to use a hash map in Java to store key-value pairs, access and print values, add and remove entries, and handle nulls and case sensitivity.

Explore how Java uses classes, the main method, and static versus instance methods to access and run code across multiple classes, including printing outputs from different class methods.

Learn how to organize Java code with multiple packages to keep large projects maintainable. Access static methods across classes and compare package structures for efficient design.