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Mastering Java Basics: Download, Create, Run Java Programs with Eclipse

Learn to download Java, Eclipse, create Java programs, run them using Eclipse, command line, set up environment variables, and understand Java bytecode and the Java Virtual Machine.

jessicawilliamson
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Mastering Java Basics: Download, Create, Run Java Programs with Eclipse

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  1. COP 3330 Notes 1/12

  2. Today's topics • Downloading Java and Eclipse • Hello World • Basic control structures • Basic I/O • Strings

  3. Downloading Java

  4. Downloading Java

  5. Downloading Java

  6. Downloading Eclipse

  7. Downloading Eclipse

  8. Creating a Java Program With Eclipse

  9. Creating a Java Program With Eclipse

  10. Creating a Java Program With Eclipse

  11. Creating a Java Program With Eclipse

  12. Creating a Java Program With Eclipse

  13. Running a Java Program With Eclipse

  14. Running a Java Program With Eclipse • Double-click Java Application

  15. Running a Java Program With Eclipse

  16. Running a Java Program Using Command Line

  17. Running a Java Program Using Command Line

  18. Running a Java Program Using Command Line

  19. Running a Java Program Using Command Line • Add the path of the bin directory of your JDK install to your path environment variable • In my case: • C:\Program Files\Java\jdk1.5.0_04\bin

  20. Running a Java Program Using Command Line

  21. Running a Java Program Using Command Line

  22. Running a Java Program Using Command Line • If you get the error: • Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp • Make sure you’re in the same directory as your .java file and that you typed everything correctly • If you still get the error, type at the command line: set CLASSPATH=

  23. Java Virtual Machine • Java is compiled to Java bytecode, not machine language • Java bytecode is similar to machine code except that it is meant for the Java Virtual Machine (JVM) • The JVM is an interpreter of Java bytecode (i.e. it runs Java programs)

  24. Java Virtual Machine • Machine language must be specific to a processor, so programs written in most languages must be recompiled to run on different processors • The same compiled Java program can run on any computer that can run the correct version of the JVM

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