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Java

Application Programs. Java Application. API. Java APIs. Kernel. JVM. HW. Java. Java Java Virtual Machine (JVM) Java Application Program Interface (API). Java APIs. Client-Side applications Server-Side applications Client/Server applications Internet (Web) applications.

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Java

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  1. Application Programs Java Application API Java APIs Kernel JVM HW Java • Java • Java Virtual Machine (JVM) • Java Application Program Interface (API) e-business and Information Systems

  2. Java APIs Client-Side applications Server-Side applications Client/Server applications Internet (Web) applications e-business and Information Systems

  3. JAVA Compiler Java Compiler Java Byte Code Source Code javac Executable by JVM Readable by human e-business and Information Systems

  4. Java Byte Code JAVA Virtual Machine (JVM) Windows OS JVM for Windows JVM for Linux Linux OS interpreter java Mac OS JVM for Mac Executable by JVM HP OS JVM for HP JVM - JRE e-business and Information Systems

  5. JavaSoftware Development Kit • Download and install: • SDK 1.3 or higher • Commands in bin directory: • javac – java compiler • java - execution • jar – java zip/tar e-business and Information Systems

  6. Java Example:Source Code //File: HelloWorld.java import java.io.*; publicclass HelloWorld { publicstaticvoid main(String[] args){ System.out.println("Hello World!"); } //End of main } //End of class e-business and Information Systems

  7. Java Example:Generate Byte Code Source Code: HelloWorld.java Set Path: set path=c:\sdk1.3\bin;%path% Compile: javac HelloWorld.java Byte code: HelloWorld.class e-business and Information Systems

  8. Java Example:Execute ByteCode java HelloWorld e-business and Information Systems

  9. Java Example:Windows98 - DOS e-business and Information Systems

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