Java: test with 'Hello World'

[last updated: 2019-05-23]
go to: Java: download & install on Linux
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After successful installation, as evidenced by $ java -version,
and after editing /etc/profile to add system variables,

• use text editor to write a Java program:
  class A {
      public static void main(String args[]) {
          System.out.println("Hello World");
      }
  }
• save the file/program as (eg.) myProg.java
• Then compile it:
  $ javac myProg.java
• This creates a file named "A.class", the "A" being the name of the class that you've defined in your program.
• Then this file is executed with:
  $ java A

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