JDK 13 RFR of JDK-8217000: Refactor Class::methodToString

[Joe Darcy]

Hello,

Please review a small factoring of several methods in java.lang.Class:

     JDK-8217000: Refactor Class::methodToString
     http://cr.openjdk.java.net/~darcy/8217000.0/

Patch below; thanks,

-Joe

--- old/src/java.base/share/classes/java/lang/Class.java 2019-01-14 
18:05:22.194000999 -0800
+++ new/src/java.base/share/classes/java/lang/Class.java 2019-01-14 
18:05:21.938000999 -0800
@@ -272,8 +272,9 @@

              TypeVariable<?>[] typeparms = component.getTypeParameters();
              if (typeparms.length > 0) {
- sb.append(Stream.of(typeparms).map(Class::typeVarBounds).
-                          collect(Collectors.joining(",", "<", ">")));
+                sb.append(Arrays.stream(typeparms)
+                          .map(Class::typeVarBounds)
+                          .collect(Collectors.joining(",", "<", ">")));
              }

              for (int i = 0; i < arrayDepth; i++)
@@ -289,8 +290,9 @@
              return typeVar.getName();
          } else {
              return typeVar.getName() + " extends " +
-                Stream.of(bounds).map(Type::getTypeName).
-                collect(Collectors.joining(" & "));
+                Arrays.stream(bounds)
+                .map(Type::getTypeName)
+                .collect(Collectors.joining(" & "));
          }
      }

@@ -3419,8 +3421,9 @@
          StringBuilder sb = new StringBuilder();
          sb.append(getName() + "." + name + "(");
          if (argTypes != null) {
-            sb.append(Stream.of(argTypes).map(c -> {return (c == null) 
? "null" : c.getName();}).
-                      collect(Collectors.joining(",")));
+            sb.append(Arrays.stream(argTypes)
+                      .map(c -> (c == null) ? "null" : c.getName())
+                      .collect(Collectors.joining(",")));
          }
          sb.append(")");
          return sb.toString();