commands.sh

bc223913@juno> javac -version
~/hello
javac 1.7.0_75
bc223913@juno> java -version
~/hello
java version "1.7.0_75"
OpenJDK Runtime Environment (rhel-2.5.4.0.el6_6-x86_64 u75-b13)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)
bc223913@juno> javac Hello.java
~/hello
bc223913@juno> java Hello
~/hello
Hello, world
bc223913@juno> 

Hello.java

public class Hello {

    public static void main(String[] args) {

        System.out.println("Hello, world");

    }
}