Into the pit Meng new, self-summary

Java cognitive

Java is a cross-platform language compiler after the first run

java file by calling javac JVM execute compiled .class file, and then run the file through java java command

Java was developed by installing the JDK:

JDK range:

• JRE
  • 　　JVM: Java Virtual Machine
  • 　　Java core class libraries AOPI
• development tools

After you install the JDK folder usefulness:

bin: JDK directory command

conf: configuration files

lib: JDK nice jar package

include: java header files for other platforms

jmods: JDK various modules

legal: JDK authorization file

Meng knock first new Java file HelloWorld.java

1 class HelloWorld{
2         public static void main(String[] args){
3                 System.out.println("HelloWorld!!!");            
4         }  
5 }    

Today to share here, flying !!!