Once you finish the beginner course, then you can take this intermediate Object Oriented Programming course. In this Udacity course, you will learn about arrays, objects, classes, loops, debugging, and more. In this Coursera course, you will learn about different sorting algorithms, and the basics of predictive text. Java Programming: Principles of Software Design You will also build a mini project about the Vigenère cipher. In this Coursera course, you will learn about arrays, cryptography, HashMaps, and more. Java Programming: Arrays, Lists, and Structured Data You will also learn how to work with CSV files in Java and build a mini project. In this Coursera course, you will learn about the classes, conditionals, loops, functions and more. Java Programming: Solving Problems with Software In this SoloLearn course, you will learn about arrays, objects, classes, loops, and more. You will also build a mortgage calculator. In this Programming with Mosh YouTube course, you will learn about strings, arrays, conditionals, loops and more.

Java Virtual Machine Architecture Explained for Beginners - freeCodeCamp.

Learn Functional Programming in Java - freeCodeCamp.

Intro to Java Programming Course for Absolute Beginners - freeCodeCamp.

Java Programming - Test Automation University.

Java Programming: Principles of Software Design - Coursera.

Java Programming: Arrays, Lists, and Structured Data - Coursera.

Java Programming: Solving Problems with Software - Coursera.

Java Tutorial for Beginners - Programming with Mosh.

If you are interested in learning Java, then there are plenty of free online courses to choose from.

Java is a really popular programming language that has been around for over 25+ years.

Open source java programs