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Java is Awesome

Java is Awesome. Sean Pierce. What is the JVM and Why do I care?. What is the JVM and Why do I care?. Similar to an android app running inside it’s simulator on multiple platforms. Compiling byte code vs. C code. What is the JVM and Why do I care?. Multiple platforms

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Java is Awesome

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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. Project 1 • Create a class, with one method • Arrays are collections objects in Java but have special syntax • int input; • int[] inputArray; • inputArray = new int[4]; • Object[] objArray = new Object[4]; • String[] names = new String[10];//the array is null’ed • No segfault, ArrayIndexOutOfBoundsException • Output • System.out.print ("Testing All the possible values\n"); • System.out.println("Testing All the possible values"); • System.out.printf("%d", inputArray[0]); • Remember: BlueJ Projects = Directories

  11. 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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