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

rev 48077 : 8193128: Reduce number of implementation classes returned by List/Set/Map.of()
Reviewed-by: smarks

@@ -786,11 +786,11 @@
      * @return an empty {@code List}
      *
      * @since 9
      */
     static <E> List<E> of() {
-        return ImmutableCollections.List0.instance();
+        return ImmutableCollections.AbstractImmutableList.emptyList();
     }
 
     /**
      * Returns an unmodifiable list containing one element.
      *

@@ -802,11 +802,11 @@
      * @throws NullPointerException if the element is {@code null}
      *
      * @since 9
      */
     static <E> List<E> of(E e1) {
-        return new ImmutableCollections.List1<>(e1);
+        return ImmutableCollections.AbstractImmutableList.of(e1);
     }
 
     /**
      * Returns an unmodifiable list containing two elements.
      *

@@ -819,11 +819,11 @@
      * @throws NullPointerException if an element is {@code null}
      *
      * @since 9
      */
     static <E> List<E> of(E e1, E e2) {
-        return new ImmutableCollections.List2<>(e1, e2);
+        return ImmutableCollections.AbstractImmutableList.of(e1, e2);
     }
 
     /**
      * Returns an unmodifiable list containing three elements.
      *

@@ -1027,20 +1027,11 @@
      * @since 9
      */
     @SafeVarargs
     @SuppressWarnings("varargs")
     static <E> List<E> of(E... elements) {
-        switch (elements.length) { // implicit null check of elements
-            case 0:
-                return ImmutableCollections.List0.instance();
-            case 1:
-                return new ImmutableCollections.List1<>(elements[0]);
-            case 2:
-                return new ImmutableCollections.List2<>(elements[0], elements[1]);
-            default:
-                return new ImmutableCollections.ListN<>(elements);
-        }
+        return ImmutableCollections.AbstractImmutableList.of(elements);
     }
 
     /**
      * Returns an <a href="#unmodifiable">unmodifiable List</a> containing the elements of
      * the given Collection, in its iteration order. The given Collection must not be null,