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src/java.base/share/classes/java/util/List.java
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rev 48077 : 8193128: Reduce number of implementation classes returned by List/Set/Map.of()
Reviewed-by: smarks
*** 786,796 ****
* @return an empty {@code List}
*
* @since 9
*/
static <E> List<E> of() {
! return ImmutableCollections.List0.instance();
}
/**
* Returns an unmodifiable list containing one element.
*
--- 786,796 ----
* @return an empty {@code List}
*
* @since 9
*/
static <E> List<E> of() {
! return ImmutableCollections.emptyList();
}
/**
* Returns an unmodifiable list containing one element.
*
*** 802,812 ****
* @throws NullPointerException if the element is {@code null}
*
* @since 9
*/
static <E> List<E> of(E e1) {
! return new ImmutableCollections.List1<>(e1);
}
/**
* Returns an unmodifiable list containing two elements.
*
--- 802,812 ----
* @throws NullPointerException if the element is {@code null}
*
* @since 9
*/
static <E> List<E> of(E e1) {
! return new ImmutableCollections.List12<>(e1);
}
/**
* Returns an unmodifiable list containing two elements.
*
*** 819,829 ****
* @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);
}
/**
* Returns an unmodifiable list containing three elements.
*
--- 819,829 ----
* @throws NullPointerException if an element is {@code null}
*
* @since 9
*/
static <E> List<E> of(E e1, E e2) {
! return new ImmutableCollections.List12<>(e1, e2);
}
/**
* Returns an unmodifiable list containing three elements.
*
*** 1029,1043 ****
@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);
}
}
--- 1029,1043 ----
@SafeVarargs
@SuppressWarnings("varargs")
static <E> List<E> of(E... elements) {
switch (elements.length) { // implicit null check of elements
case 0:
! return ImmutableCollections.emptyList();
case 1:
! return new ImmutableCollections.List12<>(elements[0]);
case 2:
! return new ImmutableCollections.List12<>(elements[0], elements[1]);
default:
return new ImmutableCollections.ListN<>(elements);
}
}
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