Learn to code in Java — a robust programming language used to create software, web and mobile apps, and more.

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Ready to start your journey into the Java programming language? This course will walk you through understanding the program structure of a Java program, running your very first Java-based code, …

Take this course meant for experienced programmers and learn Java, one of the world's most popular languages.

In this course, you’ll learn the foundations of object-oriented programming, write your own classes, create your own objects, and finally dive into some of the most common built-in Java classes.

This course helps you write cleaner, more efficient code while deepening your understanding of core Java concepts. You’ll explore advanced topics like collections, threading, and testing frameworks, …

Learn to code in Java — a robust programming language used to create software, web and mobile apps, and more.

Learn the technical skills to get the job you want. Join over 50 million people choosing Codecademy to start a new career (or advance in their current one).

In Java, when we compile a program, each individual class is converted into a .class file, which is known as byte code. The JVM (Java virtual machine) is used to run the byte code.

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