java2dart improvements and new analyzer_experimental snapshot.

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

 library java.core;
 
 import "dart:math" as math;
 import "dart:collection" show ListBase;
 
 class JavaSystem {
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }
 
@@ skipping 536 matching lines @@
     } else if (sb.length > newLength) {
       var s = sb.toString().substring(0, newLength);
       sb = new StringBuffer(s);
     }
   }
   void clear() {
     sb = new StringBuffer();
   }
 }
 
-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;
 }