src/java.base/share/classes/java/lang/Class.java

@@ -56,10 +56,11 @@
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 import java.util.StringJoiner;
 
 import jdk.internal.HotSpotIntrinsicCandidate;
 import jdk.internal.loader.BootLoader;
 import jdk.internal.loader.BuiltinClassLoader;

@@ -456,11 +457,10 @@
 
     /**
      * Returns {@code true} if this class is a value class.
      *
      * @return {@code true} if this class is a value class.
-     * @since 11
      */
     public boolean isValue() {
         int mods = this.getModifiers();
         if ((mods & VALUE_TYPE) != 0) {
             if ((mods & (Modifier.INTERFACE | Modifier.ABSTRACT)) != 0) {

@@ -473,10 +473,33 @@
         }
         return false;
     }
 
     /**
+     * Returns the names listed in the {@code "ValueTypes"} attribute.
+     */
+    Set<String> getDeclaredValueTypeNames() {
+        Set<String> names = declaredValueTypeNames;
+        if (names == null) {
+            String[] lvts = getLocalValueTypes0();
+            if (lvts != null) {
+                for (int i=0; i < lvts.length; i++) {
+                    lvts[i] = lvts[i].replace('/', '.');
+                }
+                names = Set.of(lvts);
+            } else {
+                names = Set.of();
+            }
+            declaredValueTypeNames = names;
+        }
+        return declaredValueTypeNames;
+    }
+
+    private transient volatile Set<String> declaredValueTypeNames;
+    private native String[] getLocalValueTypes0();
+
+    /**
      * Creates a new instance of the class represented by this {@code Class}
      * object.  The class is instantiated as if by a {@code new}
      * expression with an empty argument list.  The class is initialized if it
      * has not already been initialized.
      *