Replace ${name} with $name where possible.

pkg/analyzer/lib/src/generated/java_core.dart

 library java.core;
 
 import "dart:math" as math;
 
 final Stopwatch nanoTimeStopwatch = new Stopwatch();
 
 const int LONG_MAX_VALUE = 0x7fffffffffffffff;
 
 class JavaSystem {
   static int currentTimeMillis() {
@@ skipping 279 matching lines @@
 class RuntimeException extends JavaException {
   RuntimeException({String message: "", Exception cause: null}) :
     super(message, cause);
 }
 
 class JavaException implements Exception {
   final String message;
   final Exception cause;
   JavaException([this.message = "", this.cause = null]);
   JavaException.withCause(this.cause) : message = null;
-  String toString() => "${runtimeType}: $message $cause";
+  String toString() => "$runtimeType: $message $cause";
 }
 
 class JavaIOException extends JavaException {
   JavaIOException([message = "", cause = null]) : super(message, cause);
 }
 
 class IllegalArgumentException extends JavaException {
   IllegalArgumentException([message = "", cause = null]) : super(message, cause);
 }
 
@@ skipping 145 matching lines @@
  *     format('{0} are you {1}ing?', ['What', 'read']) = 'What are you reading?'
  */
 String formatList(String pattern, List args) {
   return pattern.replaceAllMapped(new RegExp(r'\{(\d+)\}'), (match) {
     String indexStr = match.group(1);
     int index = int.parse(indexStr);
     var arg = args[index];
     return arg != null ? arg.toString() : null;
   });
 }