JavaSE01

Environment variables:

JAVA_HOME=D:\java\package\jdk1.7.0_51

Path = %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;

classpath = .;

The first java program:

public class HelloWorld{

　　public static void main(String[] args){

　　　　System.out.print("Hello World!");

　　} 

}

Save as HelloWord.java

cmd

cd java\project\Demo

javac HelloWorld.java

java HelloWorld