Java01 What is java

The book I learn is named Oreilly.Java.in.a.Nutshell.5th.Edition.Mar.2005

Sun’s motto:Write once,run anywhere.

It increates end users’ freedom to choose an operating system.

The most important parts:

1. The Java Programming Language

2. The Java Virtual Machine

3. The Java Platform

Now I do not try to make sure what it is,because I think that it would waste my time.Not the reason that it’s not important,but that I can understand little about the 3 parts from the book .However,I have no ability to explain them because I just begin to learn Java.And by english book…

And I have to admit that the first purpose I learn Jave is studying english…

There are something others about Jave:

The place we run the Jave programs is called JDK.We can download from http://java.sun.com

PS:JRE,Java Runtime Environment which enables you to run existing Java programs.

IDEs,integrated(lost?~) development environment.(I think they are not important for me now.)