Computer History Notes - Herong's Tutorial Notes - v3.13, by Herong Yang
Java Is Platform Independent
This section describes how a Java program can be written and compiled on a Linux system first. The compiled code can be then transferred to a Windows system for execution.
Java is platform independent. Programs written in Java can run on any operating system platform through a Java Virtual Machine (JVM) for that platform.
Sun Microsystems officially provides JVM for the following operating system/platforms:
For example, you can write a Java program and compile it on a Linux system:
%cat Hello.java
class Hello {
public static void main(String[] a) {
System.out.println("Hello world!");
}
}
%javac Hello.java
%ls Hello.class
Then transfer the compiled code, Hello.class, to a Windows system and run it there:
herong> dir Hello.class herong> java Hello Hello world!
Table of Contents
2002 - .NET Framework Developed by Microsoft
1995 - PHP: Hypertext Preprocessor Created by Rasmus Lerdorf
►1995 - Java Language Developed by Sun Microsystems
Java Compilation and Execution Processes
Java Is an Object-Oriented Language
Java Supports Automatic Garbage Collection
Java Supports Multi-Threading Programming
1991 - WWW (World Wide Web) Developed by Tim Berners-Lee
1991 - Gopher Protocol Created by a University of Minnesota Team
1984 - X Window System Developed a MIT Team
1984 - Macintosh Developed by Apple Inc.
1983 - "Sendmail" Mail Transfer Agent Developed by Eric Allman
1979 - The Tcsh (TENEX C Shell) Developed by Ken Greer
1978 - Bash (Bourne-Again Shell) Developed by Brian Fox
1978 - The C Shell Developed by Bill Joy
1977 - The Bourne Shell Developed by Stephen Bourne
1977 - Apple II Designed by Steve Jobs and Steve Wozniak
1976 - vi Text Editor Developed by Bill Joy
1974 - Internet by Vinton Cerf
1972 - C Language Developed by Dennis Ritchie
1971 - FTP Protocol Created by Abhay Bhushan
1970 - UNIX Operating System Developed by AT&T Bell Labs