java2dart improvement - use field if getter/setter are trivial.

pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 library engine.utilities.dart;
 import 'java_core.dart';
 /**
  * The enumeration `ParameterKind` defines the different kinds of parameters. There are two
  * basic kinds of parameters: required and optional. Optional parameters are further divided into
  * two kinds: positional optional and named optional.
  *
  * @coverage dart.engine.utilities
  */
 class ParameterKind extends Enum<ParameterKind> {
   static final ParameterKind REQUIRED = new ParameterKind('REQUIRED', 0, false);
   static final ParameterKind POSITIONAL = new ParameterKind('POSITIONAL', 1, true);
   static final ParameterKind NAMED = new ParameterKind('NAMED', 2, true);
   static final List<ParameterKind> values = [REQUIRED, POSITIONAL, NAMED];
 
   /**
    * A flag indicating whether this is an optional parameter.
    */
-  bool _isOptional2 = false;
+  bool isOptional = false;
 
   /**
    * Initialize a newly created kind with the given state.
    *
    * @param isOptional `true` if this is an optional parameter
    */
   ParameterKind(String name, int ordinal, bool isOptional) : super(name, ordinal) {
-    this._isOptional2 = isOptional;
+    this.isOptional = isOptional;
   }
-
-  /**
-   * Return `true` if this is an optional parameter.
-   *
-   * @return `true` if this is an optional parameter
-   */
-  bool get isOptional => _isOptional2;
 }