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Préférences
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JavaTM 2 Platform Std. Ed. v1.4.2
java.util
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Field Summary |
Fields inherited from class java.util.AbstractList |
modCount |
Constructor Summary | |
ArrayList()
Constructs an empty list with an initial capacity of ten. |
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ArrayList(Collection c)
Constructs a list containing the elements of the specified collection, in the order they are returned by the collection's iterator. |
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ArrayList(int initialCapacity)
Constructs an empty list with the specified initial capacity. |
Method Summary | |
void |
add(int index,
Object element)
Inserts the specified element at the specified position in this list. |
boolean |
add(Object o)
Appends the specified element to the end of this list. |
boolean |
addAll(Collection c)
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. |
boolean |
addAll(int index,
Collection c)
Inserts all of the elements in the specified Collection into this list, starting at the specified position. |
void |
clear()
Removes all of the elements from this list. |
Object |
clone()
Returns a shallow copy of this ArrayList instance. |
boolean |
contains(Object elem)
Returns true if this list contains the specified element. |
void |
ensureCapacity(int minCapacity)
Increases the capacity of this ArrayList instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument. |
Object |
get(int index)
Returns the element at the specified position in this list. |
int |
indexOf(Object elem)
Searches for the first occurence of the given argument, testing for equality using the equals method. |
boolean |
isEmpty()
Tests if this list has no elements. |
int |
lastIndexOf(Object elem)
Returns the index of the last occurrence of the specified object in this list. |
Object |
remove(int index)
Removes the element at the specified position in this list. |
protected void |
removeRange(int fromIndex,
int toIndex)
Removes from this List all of the elements whose index is between fromIndex, inclusive and toIndex, exclusive. |
Object |
set(int index,
Object element)
Replaces the element at the specified position in this list with the specified element. |
int |
size()
Returns the number of elements in this list. |
Object[] |
toArray()
Returns an array containing all of the elements in this list in the correct order. |
Object[] |
toArray(Object[] a)
Returns an array containing all of the elements in this list in the correct order; the runtime type of the returned array is that of the specified array. |
void |
trimToSize()
Trims the capacity of this ArrayList instance to be the list's current size. |
Methods inherited from class java.util.AbstractList |
equals, hashCode, iterator, listIterator, listIterator, subList |
Methods inherited from class java.util.AbstractCollection |
containsAll, remove, removeAll, retainAll, toString |
Methods inherited from class java.lang.Object |
finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.List |
containsAll, equals, hashCode, iterator, listIterator, listIterator, remove, removeAll, retainAll, subList |
Constructor Detail |
public ArrayList(int initialCapacity)
initialCapacity
- the initial capacity of the list.
IllegalArgumentException
- if the specified initial capacity
is negativepublic ArrayList()
public ArrayList(Collection c)
c
- the collection whose elements are to be placed into this list.
NullPointerException
- if the specified collection is null.Method Detail |
public void trimToSize()
public void ensureCapacity(int minCapacity)
minCapacity
- the desired minimum capacity.public int size()
size
in interface List
size
in class AbstractCollection
public boolean isEmpty()
isEmpty
in interface List
isEmpty
in class AbstractCollection
public boolean contains(Object elem)
contains
in interface List
contains
in class AbstractCollection
elem
- element whose presence in this List is to be tested.
true
if the specified element is present;
false
otherwise.public int indexOf(Object elem)
indexOf
in interface List
indexOf
in class AbstractList
elem
- an object.
Object.equals(Object)
public int lastIndexOf(Object elem)
lastIndexOf
in interface List
lastIndexOf
in class AbstractList
elem
- the desired element.
public Object clone()
Cloneable
public Object[] toArray()
toArray
in interface List
toArray
in class AbstractCollection
public Object[] toArray(Object[] a)
If the list fits in the specified array with room to spare (i.e., the array has more elements than the list), the element in the array immediately following the end of the collection is set to null. This is useful in determining the length of the list only if the caller knows that the list does not contain any null elements.
toArray
in interface List
toArray
in class AbstractCollection
a
- the array into which the elements of the 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 a is not a supertype
of the runtime type of every element in this list.public Object get(int index)
get
in interface List
get
in class AbstractList
index
- index of element to return.
IndexOutOfBoundsException
- if index is out of range (index
< 0 || index >= size()).public Object set(int index, Object element)
set
in interface List
set
in class AbstractList
index
- index of element to replace.element
- element to be stored at the specified position.
IndexOutOfBoundsException
- if index out of range
(index < 0 || index >= size()).public boolean add(Object o)
add
in interface List
add
in class AbstractList
o
- element to be appended to this list.
public void add(int index, Object element)
add
in interface List
add
in class AbstractList
index
- index at which the specified element is to be inserted.element
- element to be inserted.
IndexOutOfBoundsException
- if index is out of range
(index < 0 || index > size()).public Object remove(int index)
remove
in interface List
remove
in class AbstractList
index
- the index of the element to removed.
IndexOutOfBoundsException
- if index out of range (index
< 0 || index >= size()).public void clear()
clear
in interface List
clear
in class AbstractList
public boolean addAll(Collection c)
addAll
in interface List
addAll
in class AbstractCollection
c
- the elements to be inserted into this list.
NullPointerException
- if the specified collection is null.AbstractCollection.add(Object)
public boolean addAll(int index, Collection c)
addAll
in interface List
addAll
in class AbstractList
index
- index at which to insert first element
from the specified collection.c
- elements to be inserted into this list.
IndexOutOfBoundsException
- if index out of range (index
< 0 || index > size()).
NullPointerException
- if the specified Collection is null.protected void removeRange(int fromIndex, int toIndex)
removeRange
in class AbstractList
fromIndex
- index of first element to be removed.toIndex
- index after last element to be removed.