public final class OneItemList<E> extends AbstractList<E> implements RandomAccess
List interface. Implements all
optional list operations, except those which would change the number of list
items. Permits all elements, including null.
All operations run in constant time.
modCount| Constructor and Description |
|---|
OneItemList(E item)
Constructs a list with exactly the specified object as its content.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
add(E e)
Since instances of this class cannot be modified in size, this method
always throws an Exception.
|
boolean |
contains(Object o)
Returns
true if this list contains the specified element. |
E |
get(int index)
Returns the element at the specified position in this list.
|
boolean |
isEmpty()
Returns
false. |
Iterator<E> |
iterator()
Returns an iterator over the one element in this list.
|
ListIterator<E> |
listIterator(int index)
Returns an iterator over the one element in this list.
|
boolean |
removeAll(Collection<?> c)
Since instances of this class cannot be modified in size, this method
always throws an Exception.
|
boolean |
retainAll(Collection<?> c)
Since instances of this class cannot be modified in size, this method
always throws an Exception.
|
int |
size()
Returns
1. |
Object[] |
toArray()
Returns an array containing the one element in this list.
|
<T> T[] |
toArray(T[] a)
Returns an array containing the one element in this list; the runtime
type of the returned array is that of the specified array.
|
String |
toString()
Returns a string representation of this collection.
|
add, addAll, clear, equals, hashCode, indexOf, lastIndexOf, listIterator, remove, removeRange, set, subListaddAll, containsAll, removeclone, finalize, getClass, notify, notifyAll, wait, wait, waitaddAll, containsAll, remove, replaceAll, sort, spliteratorparallelStream, removeIf, streampublic OneItemList(E item)
item - the single list item to be the content of this listpublic boolean add(E e)
add in interface Collection<E>add in interface List<E>add in class AbstractList<E>UnsupportedOperationExceptionpublic E get(int index)
get in interface List<E>get in class AbstractList<E>index - index of the element to returnIndexOutOfBoundsException - unless index == 0public ListIterator<E> listIterator(int index)
listIterator in interface List<E>listIterator in class AbstractList<E>index - irst element to be returned from the list iterator (by a
call to the next method)IndexOutOfBoundsException - unless index == 0public int size()
1.size in interface Collection<E>size in interface List<E>size in class AbstractCollection<E>public boolean isEmpty()
false.isEmpty in interface Collection<E>isEmpty in interface List<E>isEmpty in class AbstractCollection<E>falsepublic boolean contains(Object o)
true if this list contains the specified element.
More formally, returns true if and only if this list's one
element is identical to the object specified.contains in interface Collection<E>contains in interface List<E>contains in class AbstractCollection<E>o - element whose presence in this list is to be testedtrue if this list contains the specified elementpublic Object[] toArray()
toArray in interface Collection<E>toArray in interface List<E>toArray in class AbstractCollection<E>1 containing exactly the one
element in this list.Arrays.asList(Object[])public <T> T[] toArray(T[] a)
1, it is returned therein.
Otherwise, a new array is allocated with the runtime type of the
specified array and the length 1.toArray in interface Collection<E>toArray in interface List<E>toArray in class AbstractCollection<E>a - the array into which the element of this list are to be
stored, if it is big enough; otherwise, a new array of the same runtime
type is allocated for this purpose.ArrayStoreException - if the runtime type of the specified array
is not a supertype of the runtime type of the element in this listNullPointerException - if the specified array is nullpublic boolean removeAll(Collection<?> c)
removeAll in interface Collection<E>removeAll in interface List<E>removeAll in class AbstractCollection<E>UnsupportedOperationExceptionpublic boolean retainAll(Collection<?> c)
retainAll in interface Collection<E>retainAll in interface List<E>retainAll in class AbstractCollection<E>UnsupportedOperationExceptionpublic String toString()
"[]"). Elements are converted to strings as by
String.valueOf(Object).toString in class AbstractCollection<E>