code: static public String[] getAllProperties() {
          java.util.Properties prop = System.getProperties();
          java.util.ArrayList<String> list = new java.util.ArrayList<String>();
          java.util.Enumeration<?> enumeration = prop.propertyNames();
          while (enumeration.hasMoreElements()) {
              list.add((String)enumeration.nextElement());
          }
          return list.toArray(new String[0]);
      }
docs: Get all property names.
  
  @return String array of all property names.