code: public void setThings(java.util.Collection<String> things) {
          if (things == null) {
              this.things = null;
              return;
          }
  
          this.things = new java.util.ArrayList<String>(things);
      }
docs: <p>
  The things in the specified thing group.
  </p>
  
  @param things
  The things in the specified thing group.