Java is a versatile, object-oriented programming language that is designed to run on a wide variety of platforms. Any machine that has a Java Virtual Machine, or JVM, can run Java apps. For that reason, Java is commonly used in a wide range of applications, including web, mobile, and desktop. Many of the apps you know and love were likely written in Java! In this course, instructor Todd Perkins, who has developed more than a dozen popular apps and games, uses a series of practical challenges to test your knowledge of Java collections and improve your programming problem-solving skills.