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java.lang.Object java.util.Collections.UnmodifiableCollection java.util.Collections.UnmodifiableList java.util.Collections.UnmodifiableRandomAccessList
Field Summary | |
(package private) Collection |
c
|
(package private) List |
list
|
private static long |
serialVersionUID
|
Constructor Summary | |
(package private) |
Collections.UnmodifiableRandomAccessList(List list)
|
Method Summary | |
void |
add(int index,
Object element)
Inserts the specified element at the specified position in this list (optional operation). |
boolean |
add(Object o)
Appends the specified element to the end of this list (optional operation). |
boolean |
addAll(Collection coll)
Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's iterator (optional operation). |
boolean |
addAll(int index,
Collection c)
Inserts all of the elements in the specified collection into this list at the specified position (optional operation). |
void |
clear()
Removes all of the elements from this list (optional operation). |
boolean |
contains(Object o)
Returns true if this list contains the specified element. |
boolean |
containsAll(Collection coll)
Returns true if this list contains all of the elements of the specified collection. |
boolean |
equals(Object o)
Compares the specified object with this list for equality. |
Object |
get(int index)
Returns the element at the specified position in this list. |
int |
hashCode()
Returns the hash code value for this list. |
int |
indexOf(Object o)
Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element. |
boolean |
isEmpty()
Returns true if this list contains no elements. |
Iterator |
iterator()
Returns an iterator over the elements in this list in proper sequence. |
int |
lastIndexOf(Object o)
Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element. |
ListIterator |
listIterator()
Returns a list iterator of the elements in this list (in proper sequence). |
ListIterator |
listIterator(int index)
Returns a list iterator of the elements in this list (in proper sequence), starting at the specified position in this list. |
Object |
remove(int index)
Removes the element at the specified position in this list (optional operation). |
boolean |
remove(Object o)
Removes the first occurrence in this list of the specified element (optional operation). |
boolean |
removeAll(Collection coll)
Removes from this list all the elements that are contained in the specified collection (optional operation). |
boolean |
retainAll(Collection coll)
Retains only the elements in this list that are contained in the specified collection (optional operation). |
Object |
set(int index,
Object element)
Replaces the element at the specified position in this list with the specified element (optional operation). |
int |
size()
Returns the number of elements in this list. |
List |
subList(int fromIndex,
int toIndex)
Returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive. |
Object[] |
toArray()
Returns an array containing all of the elements in this list in proper sequence. |
Object[] |
toArray(Object[] a)
Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array. |
String |
toString()
Returns a string representation of the object. |
private Object |
writeReplace()
Allows instances to be deserialized in pre-1.4 JREs (which do not have UnmodifiableRandomAccessList). |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.List |
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray |
Field Detail |
private static final long serialVersionUID
List list
Collection c
Constructor Detail |
Collections.UnmodifiableRandomAccessList(List list)
Method Detail |
public List subList(int fromIndex, int toIndex)
List
This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a list can be used as a range operation by passing a subList view instead of a whole list. For example, the following idiom removes a range of elements from a list:
list.subList(from, to).clear();Similar idioms may be constructed for indexOf and lastIndexOf, and all of the algorithms in the Collections class can be applied to a subList.
The semantics of the list returned by this method become undefined if the backing list (i.e., this list) is structurally modified in any way other than via the returned list. (Structural modifications are those that change the size of this list, or otherwise perturb it in such a fashion that iterations in progress may yield incorrect results.)
subList
in interface List
subList
in class Collections.UnmodifiableList
private Object writeReplace()
public boolean equals(Object o)
List
equals
in interface List
equals
in class Object
o
- the reference object with which to compare.
true
if this object is the same as the obj
argument; false
otherwise.Object.hashCode()
,
Hashtable
public int hashCode()
List
hashCode = 1; Iterator i = list.iterator(); while (i.hasNext()) { Object obj = i.next(); hashCode = 31*hashCode + (obj==null ? 0 : obj.hashCode()); }This ensures that list1.equals(list2) implies that list1.hashCode()==list2.hashCode() for any two lists, list1 and list2, as required by the general contract of Object.hashCode.
hashCode
in interface List
hashCode
in class Object
Object.equals(java.lang.Object)
,
Hashtable
public Object get(int index)
List
get
in interface List
index
- index of element to return.
public Object set(int index, Object element)
List
set
in interface List
index
- index of element to replace.element
- element to be stored at the specified position.
public void add(int index, Object element)
List
add
in interface List
index
- index at which the specified element is to be inserted.element
- element to be inserted.public Object remove(int index)
List
remove
in interface List
index
- the index of the element to removed.
public int indexOf(Object o)
List
indexOf
in interface List
o
- element to search for.
public int lastIndexOf(Object o)
List
lastIndexOf
in interface List
o
- element to search for.
public boolean addAll(int index, Collection c)
List
addAll
in interface List
index
- index at which to insert first element from the specified
collection.c
- elements to be inserted into this list.
public ListIterator listIterator()
List
listIterator
in interface List
public ListIterator listIterator(int index)
List
listIterator
in interface List
index
- index of first element to be returned from the
list iterator (by a call to the next method).
public int size()
Collection
size
in interface Collection
public boolean isEmpty()
Collection
isEmpty
in interface Collection
public boolean contains(Object o)
Collection
contains
in interface Collection
o
- element whose presence in this collection is to be tested.
public Object[] toArray()
Collection
The returned array will be "safe" in that no references to it are maintained by this collection. (In other words, this method must allocate a new array even if this collection is backed by an array). The caller is thus free to modify the returned array.
This method acts as bridge between array-based and collection-based APIs.
toArray
in interface Collection
public Object[] toArray(Object[] a)
Collection
If this collection fits in the specified array with room to spare (i.e., the array has more elements than this collection), the element in the array immediately following the end of the collection is set to null. This is useful in determining the length of this collection only if the caller knows that this collection does not contain any null elements.)
If this collection makes any guarantees as to what order its elements are returned by its iterator, this method must return the elements in the same order.
Like the toArray method, this method acts as bridge between array-based and collection-based APIs. Further, this method allows precise control over the runtime type of the output array, and may, under certain circumstances, be used to save allocation costs
Suppose l is a List known to contain only strings. The following code can be used to dump the list into a newly allocated array of String:
String[] x = (String[]) v.toArray(new String[0]);
Note that toArray(new Object[0]) is identical in function to toArray().
toArray
in interface Collection
a
- the array into which the elements of this collection are to be
stored, if it is big enough; otherwise, a new array of the same
runtime type is allocated for this purpose.
public String toString()
Object
toString
method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString
method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@
', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
toString
in class Object
public Iterator iterator()
Collection
iterator
in interface Collection
public boolean add(Object o)
Collection
Collections that support this operation may place limitations on what elements may be added to this collection. In particular, some collections will refuse to add null elements, and others will impose restrictions on the type of elements that may be added. Collection classes should clearly specify in their documentation any restrictions on what elements may be added.
If a collection refuses to add a particular element for any reason other than that it already contains the element, it must throw an exception (rather than returning false). This preserves the invariant that a collection always contains the specified element after this call returns.
add
in interface Collection
o
- element whose presence in this collection is to be ensured.
public boolean remove(Object o)
Collection
remove
in interface Collection
o
- element to be removed from this collection, if present.
public boolean containsAll(Collection coll)
Collection
containsAll
in interface Collection
coll
- collection to be checked for containment in this collection.
Collection.contains(Object)
public boolean addAll(Collection coll)
Collection
addAll
in interface Collection
coll
- elements to be inserted into this collection.
Collection.add(Object)
public boolean removeAll(Collection coll)
Collection
removeAll
in interface Collection
coll
- elements to be removed from this collection.
Collection.remove(Object)
,
Collection.contains(Object)
public boolean retainAll(Collection coll)
Collection
retainAll
in interface Collection
coll
- elements to be retained in this collection.
Collection.remove(Object)
,
Collection.contains(Object)
public void clear()
Collection
clear
in interface Collection
|
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