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What is the JVM? Overview & Essential Information

This article covers essential details about the Java Virtual Machine (JVM), its importance, differences from other languages, and tips for learning Java effectively. Explore the JVM, class files, class vs. objects, NoClassDefFound error, and practical learning methods.

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What is the JVM? Overview & Essential Information

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  1. Java is Awesome Sean Pierce

  2. What is the JVM and Why do I care?

  3. What is the JVM and Why do I care? • Similar to an android app running inside it’s simulator on multiple platforms

  4. Compiling byte code vs. C code

  5. What is the JVM and Why do I care? • Multiple platforms • Heavily lifting done for you • Found in the API

  6. Introducing the Java API • Easy-to-use Ctrl + Space:

  7. Introducing the Java API • Online Documentation: http://docs.oracle.com/javase/6/docs/api/

  8. All the things you should know but no one ever told you • Java is slow but still the predominate globally dev’d language • Re-usable • secure • NoClassDefFound error • Your Environment & class paths • .jar = .zip • Commands: • javacHelloWorld.java;//produces HelloWorld.class • java HelloWorld • ‘What every programmer should know about…’ • Unicode • Security • The internet • Android programming =ish java • C# is java for Microsoft (Their VM is called CLI) • Best way to learn is to do a personal project!

  9. Structured Vs. Objects • Blueprints = class • Batmobile = Object = =

  10. Questions • How is Java different from other languages? • What is the JVM? • What does the JVM do? • How is a class different from an Object? • What is a .class file? • What is the NoClassDefFound error? • What is the best way to learn a language like Java?

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