code: /* Show the Java version.
   * Copyright (C) 2006, 2009-2018 Free Software Foundation, Inc.
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /**
   * This program shows the Java version.
   *
   * This program _must_ be compiled with
   *   javac -d . -target 1.1 javaversion.java
   * since its purpose is to show the version of _any_ Java implementation.
   *
   * @author Bruno Haible
   */
  public class javaversion {
    public static void main (String[] args) {
      System.out.println(System.getProperty("java.specification.version"));
    }
  }
  