1. Advantages: Open, cross-platform, network
2. Install JDK: Control Panel -> System -> Advanced -> Environment Variables -> New User Variables
Variable name: ClassPath variable:.; C: /J2SDK1.4.0;
JDK_HOME C: /J2SDK1.4.0
PATH C: /J2SDK1.4.0/bin;% PATH
3. J2SDK-1_4_0-doc.zip is a help file for JDK1.4.
Src.zip is a Java source code for each class in the corresponding class library.
4. Main features: JVM (Java virtual machine), garbage collection, code security
5. Source file: HelloWorld.java can be written in any text editor
Compile JAVAC to generate HelloWorld.class.
Run the command Java to generate and run the executable.
6. A file can only contain a public class, and the file name must be the same as the class name.
Write a bad written, please pay attention to the boss.
