java-based -HelloWorld

class public the HelloWorld {// source file can only have a class declared as public, and the class name and source file name was the same as
      // main entry method, a program  
      public  static  void main (String [] args) { 
            / * 
            this is the output statement program 
            * / 
    System.out.println ( "Java the Hello"); 
   }

}

class Person{

}
class Hello{

}

java file execution process: compiling: the javac.exe compiled to generate a plurality of end .class bytecode files

                              Run: java.exe

 

Notes: single-line comments // comment text 

           Multi-line comments  / * comment text * /

 Multi-line comments can not be nested