code: public ClassInfoList getStandardClasses() {
          return filter(new ClassInfoFilter() {
              @Override
              public boolean accept(final ClassInfo ci) {
                  return ci.isStandardClass();
              }
          });
      }
docs: Filter this {@link ClassInfoList} to include only standard classes (classes that are not interfaces or
  annotations).
  
  @return The filtered list, containing only standard classes.