code: private boolean shouldImport(TypeName typeName) {
          // don't import classes from the java.lang package
          String pkg = typeName.getPackageName();
          String simpleName = typeName.getSimpleName();
          boolean exclude = (pkg.equals("java.lang") || pkg.equals("")) && getJavaDefaultTypes().contains(simpleName);
          return !exclude;
      }
docs: Determines whether the given non-wildcard import should be added.
  By default, this returns false if the simple name is a built-in Java language type name.