src/java.base/share/classes/java/util/OptionalDouble.java

rev 48216 : 8140281: add no-arg Optional.orElseThrow() as preferred alternative to get()
Reviewed-by: XXX

@@ -115,18 +115,14 @@
     /**
      * If a value is present, returns the value, otherwise throws
      * {@code NoSuchElementException}.
      *
      * @apiNote
-     * The methods {@link #orElse(double) orElse} and
-     * {@link #orElseGet(DoubleSupplier) orElseGet}
-     * are generally preferable to this method, as they return a substitute
-     * value if the value is absent, instead of throwing an exception.
+     * The preferred alternative to this method is {@link #orElseThrow()}.
      *
      * @return the value described by this {@code OptionalDouble}
      * @throws NoSuchElementException if no value is present
-     * @see OptionalDouble#isPresent()
      */
     public double getAsDouble() {
         if (!isPresent) {
             throw new NoSuchElementException("No value present");
         }

@@ -224,10 +220,25 @@
     public double orElseGet(DoubleSupplier supplier) {
         return isPresent ? value : supplier.getAsDouble();
     }
 
     /**
+     * If a value is present, returns the value, otherwise throws
+     * {@code NoSuchElementException}.
+     *
+     * @return the value described by this {@code OptionalDouble}
+     * @throws NoSuchElementException if no value is present
+     * @since 10
+     */
+    public double orElseThrow() {
+        if (!isPresent) {
+            throw new NoSuchElementException("No value present");
+        }
+        return value;
+    }
+
+    /**
      * If a value is present, returns the value, otherwise throws an exception
      * produced by the exception supplying function.
      *
      * @apiNote
      * A method reference to the exception constructor with an empty argument