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java.lang.Object java.util.Collections.SynchronizedCollection
Field Summary | |
(package private) Collection |
c
|
(package private) Object |
mutex
|
private static long |
serialVersionUID
|
Constructor Summary | |
(package private) |
Collections.SynchronizedCollection(Collection c)
|
(package private) |
Collections.SynchronizedCollection(Collection c,
Object mutex)
|
Method Summary | |
boolean |
add(Object o)
Ensures that this collection contains the specified element (optional operation). |
boolean |
addAll(Collection coll)
Adds all of the elements in the specified collection to this collection (optional operation). |
void |
clear()
Removes all of the elements from this collection (optional operation). |
boolean |
contains(Object o)
Returns true if this collection contains the specified element. |
boolean |
containsAll(Collection coll)
Returns true if this collection contains all of the elements in the specified collection. |
boolean |
isEmpty()
Returns true if this collection contains no elements. |
Iterator |
iterator()
Returns an iterator over the elements in this collection. |
boolean |
remove(Object o)
Removes a single instance of the specified element from this collection, if it is present (optional operation). |
boolean |
removeAll(Collection coll)
Removes all this collection's elements that are also contained in the specified collection (optional operation). |
boolean |
retainAll(Collection coll)
Retains only the elements in this collection that are contained in the specified collection (optional operation). |
int |
size()
Returns the number of elements in this collection. |
Object[] |
toArray()
Returns an array containing all of the elements in this collection. |
Object[] |
toArray(Object[] a)
Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array. |
String |
toString()
Returns a string representation of the object. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Collection |
equals, hashCode |
Field Detail |
private static final long serialVersionUID
Collection c
Object mutex
Constructor Detail |
Collections.SynchronizedCollection(Collection c)
Collections.SynchronizedCollection(Collection c, Object mutex)
Method Detail |
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 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
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
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