RHEL/Linux/java/helloworld

lake@localhost:~/Android/training$ uname 
Linux
 
lake@localhost:~/Android/training$ cat /proc/version 
Linux version 4.13.0+ ([email protected]) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC)) #5 SMP Mon Apr 23 04:09:02 EDT 2018

lake@localhost:~/Android/training$ 

lake@localhost:~/Android/training$ which javac  

/usr/bin/javac
lake@localhost:~/Android/training$ javac -version 
javac 1.8.0_65

lake@localhost:~/Android/training$ 

lake@localhost:~/Android/training$ cat  hello.java

public class hello{
    public static void main(String args[]){
        System.out.println("Hello World.");
    }
}

lake@localhost:~/Android/training$ javac hello.java 
lake@localhost:~/Android/training$ java  hello.
hello.class  hello.java   
lake@localhost:~/Android/training$ java  hello.class 
Error: Could not find or load main class hello.class
lake@localhost:~/Android/training$ vim hello.java 
lake@localhost:~/Android/training$ java  hello
Hello World.

########## Windows  X86_64

D:\Android\Training>dir
 Volume in drive D is Data
 Volume Serial Number is DECA-CA5E


 Directory of D:\Android\Training


07/13/2018  10:58 AM    <DIR>          .
07/13/2018  10:58 AM    <DIR>          ..
07/13/2018  10:57 AM        10,810,397 Day1.rar
07/13/2018  10:42 AM               116 hello.java
               2 File(s)     10,810,513 bytes
               2 Dir(s)  311,023,194,112 bytes free


D:\Android\Training>"C:\Program Files\Java\jdk1.8.0_171\bin\javac.exe"   -version
javac 1.8.0_171


D:\Android\Training>"C:\Program Files\Java\jdk1.8.0_171\bin\javac.exe"    hello.java


D:\Android\Training>dir
 Volume in drive D is Data
 Volume Serial Number is DECA-CA5E


 Directory of D:\Android\Training


07/13/2018  11:06 AM    <DIR>          .
07/13/2018  11:06 AM    <DIR>          ..
07/13/2018  10:57 AM        10,810,397 Day1.rar
07/13/2018  11:06 AM               416 hello.class
07/13/2018  10:42 AM               116 hello.java
               3 File(s)     10,810,929 bytes
               2 Dir(s)  311,043,547,136 bytes free


D:\Android\Training>"C:\Program Files\Java\jdk1.8.0_171\bin\java.exe"  -version
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)


D:\Android\Training>"C:\Program Files\Java\jdk1.8.0_171\bin\java.exe"   hello
Hello World.

D:\Android\Training>

D:\Android\Training>.\jdk-8u171-windows-x64\bin\javac hello.java


D:\Android\Training>.\jdk-8u171-windows-x64\bin\java  hello
Hello World.


D:\Android\Training>