Windows Tutorials - Herong's Tutorial Examples - v5.62, by Dr. Herong Yang
What Is Java, JVM, JRE and JDK
This section describes what is Java, what is JVM (Java Virtual Machine), also called JRE (Java Runtime Environment), and what is JDK (Java Development Kit).
What Is Java? Java is a general-purpose programming language that was developed by Sun Microsystems. Java applications are typically compiled to bytecode (class file) that can run on any Java virtual machine (JVM) regardless of computer architecture.
What Is JVM? JVM (Java Virtual Machine) is a system application that installed on a specific computer architecture and operating system to run Java programs compiled in bytecode format.
JVM is also called JRE (Java Runtime Environment).
What Is JDK? JDK (Java Development Kit) is a development tool that allows you to compile and debug applications.
Here is a very simple program called Hello.java written in Java language:
class Hello {
public static void main(String[] a) {
System.out.println("Hello world!");
}
}
If you have JDK 7 installed on your Windows system, you can use the "javac" command in JDK to compile the above Java program like this:
C:\>\progra~1\java\jdk1.7.0_07\bin\javac Hello.java
If you have JVM (JRE) 7 installed on your Windows system, you can use the "java" command in JVM to run the compiled Java program like this:
C:\>\progra~1\java\jre7\bin\java Hello Hello world!
Table of Contents
Introduction to Microsoft Windows
Introduction to Windows Explorer
Introduction to Internet Explorer
"Paint" Program and Computer Graphics
GIMP - GNU Image Manipulation Program
JPEG Image File Format Quality and Size
GIF Image File Format and Transparent Background
"WinZip" - ZIP File Compression Tool
"WinRAR" - RAR and ZIP File Compression Tool
FTP Server, Client and Commands
"FileZilla" - Free FTP Client and Server
Web Server Log Files and Analysis Tool - "Analog"
Spyware Adware Detection and Removal
IE Addon Program Listing and Removal
Vundo (VirtuMonde/VirtuMundo) - vtsts.dll Removal
Trojan and Malware "Puper" Description and Removal
VSToolbar (VSAdd-in.dll) - Description and Removal
Spybot - Spyware Blocker, Detection and Removal
Setting Up and Using Crossover Cable Network
Home Network Gateway - DSL Modem/Wireless Router
Windows Task Manager - The System Performance Tool
"tasklist" Command Line Tool to List Process Information
"msconfig" - System Configuration Tool
Configuring and Managing System Services
Windows Registry Key and Value Management Tools
Startup Programs Removal for Better System Performance
►What Is Java, JVM, JRE and JDK