java2dart improvements and new analyzer_experimental snapshot.

editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart

Index: editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
diff --git a/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart b/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
index f4b3937205dc5319f160445c3274982743570833..c3dadd0d2165b02dbdf197271e9fbf26b1c5806b 100644
--- a/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
+++ b/editor/util/plugins/com.google.dart.java2dart/resources/java_core.dart
@@ -554,7 +554,13 @@ class JavaStringBuilder {
   }
 }
 
-abstract class Enum<E> implements Comparable<E> {
-  int get ordinal;
-  String get name;
+abstract class Enum<E extends Enum> implements Comparable<E> {
+  /// The name of this enum constant, as declared in the enum declaration.
+  final String name;
+  /// The position in the enum declaration.
+  final int ordinal;
+  Enum(this.name, this.ordinal);
+  int get hashCode => ordinal;
+  String toString() => name;
+  int compareTo(E other) => ordinal - other.ordinal;
 }