xyz.noark.core.lang

类 DoubleArrayList

java.lang.Object

xyz.noark.core.lang.DoubleArrayList

所有已实现的接口:

java.util.RandomAccess, DoubleList

public class DoubleArrayList
extends java.lang.Object
implements DoubleList, java.util.RandomAccess

DoubleList接口的大小可变数组的实现。

实现了所有可选列表操作。除了实现 FloatList 接口外，此类还提供一些方法来操作内部用来存储列表的数组的大小。
（此类大致上等同于 Java的List<Float>类）

从以下版本开始:

3.0

作者:

小流氓(176543888@qq.com)

构造器概要

构造器

构造器和说明
DoubleArrayList() 构建一个空的列表.
DoubleArrayList(int initialCapacity) 指定容量的方式构建一个IntList.

方法概要

限定符和类型	方法和说明
boolean	add(double e) Appends the specified element to the end of this list.
boolean	addAll(double[] a) 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.
void	clear() Removes all of the elements from this list.
boolean	contains(double o) Returns true if this list contains the specified element.
boolean	equals(java.lang.Object obj)
double	get(int index) Returns the element at the specified position in this list.
int	hashCode()
int	indexOf(double x) 返回此列表中第一次出现的指定元素的索引.
boolean	isEmpty() Returns true if this list contains no elements.
int	lastIndexOf(double x) 返回此列表中最后出现的指定元素的索引.
double	random() 从列表中随机出一个元素.
boolean	remove(double o) Removes the first occurrence of the specified element from this list, if it is present.
int	size() Returns the number of elements in this list.
double[]	toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
void	trimToSize() 将此IntArrayList实例的容量调整为列表的当前大小。

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

DoubleArrayList

public DoubleArrayList()

构建一个空的列表.

DoubleArrayList

public DoubleArrayList(int initialCapacity)

指定容量的方式构建一个IntList.

参数:

initialCapacity - 初始容量

方法详细资料

trimToSize

public void trimToSize()

将此IntArrayList实例的容量调整为列表的当前大小。

应用程序可以使用此操作来最小化 IntArrayList实例的存储量。

random

public double random()

从接口复制的说明: DoubleList

从列表中随机出一个元素.

指定者:

random 在接口中 DoubleList

返回:

随机元素

size

public int size()

Returns the number of elements in this list.

指定者:

size 在接口中 DoubleList

返回:

the number of elements in this list

isEmpty

public boolean isEmpty()

Returns true if this list contains no elements.

指定者:

isEmpty 在接口中 DoubleList

返回:

true if this list contains no elements

contains

public boolean contains(double o)

Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).

指定者:

contains 在接口中 DoubleList

参数:

o - element whose presence in this list is to be tested

返回:

true if this list contains the specified element

indexOf

public int indexOf(double x)

返回此列表中第一次出现的指定元素的索引.

如果列表不包含此元素，则返回 -1。
更确切地讲，返回满足 (get(i)==x) 的最高索引 i；
如果没有这样的索引，则返回 -1。

参数:

x - 要搜索的元素

返回:

列表中第一次出现的指定元素的索引；如果列表不包含此元素，则返回 -1

lastIndexOf

public int lastIndexOf(double x)

返回此列表中最后出现的指定元素的索引.

如果列表不包含此元素，则返回 -1。
更确切地讲，返回满足 (get(i)==x) 的最高索引 i；
如果没有这样的索引，则返回 -1。

参数:

x - 要搜索的元素

返回:

列表中最后出现的指定元素的索引；如果列表不包含此元素，则返回 -1

toArray

public double[] toArray()

Returns an array containing all of the elements in this list in proper sequence (from first to last element).

The returned array will be "safe" in that no references to it are maintained by this list. (In other words, this method must allocate a new array). The caller is thus free to modify the returned array.

This method acts as bridge between array-based and collection-based APIs.

指定者:

toArray 在接口中 DoubleList

返回:

an array containing all of the elements in this list in proper sequence

get

public double get(int index)

Returns the element at the specified position in this list.

指定者:

get 在接口中 DoubleList

参数:

index - index of the element to return

返回:

the element at the specified position in this list

抛出:

java.lang.IndexOutOfBoundsException

add

public boolean add(double e)

Appends the specified element to the end of this list.

指定者:

add 在接口中 DoubleList

参数:

e - element to be appended to this list

返回:

true (as specified by Collection.add(E))

remove

public boolean remove(double o)

Removes the first occurrence of the specified element from this list, if it is present. If the list does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))) (if such an element exists). Returns true if this list contained the specified element (or equivalently, if this list changed as a result of the call).

指定者:

remove 在接口中 DoubleList

参数:

o - element to be removed from this list, if present

返回:

true if this list contained the specified element

clear

public void clear()

Removes all of the elements from this list. The list will be empty after this call returns.

指定者:

clear 在接口中 DoubleList

addAll

public boolean addAll(double[] a)

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. The behavior of this operation is undefined if the specified collection is modified while the operation is in progress. (This implies that the behavior of this call is undefined if the specified collection is this list, and this list is nonempty.)

参数:

a - collection containing elements to be added to this list

返回:

true if this list changed as a result of the call

抛出:

java.lang.NullPointerException - if the specified collection is null

hashCode

public int hashCode()

覆盖:

hashCode 在类中 java.lang.Object

equals

public boolean equals(java.lang.Object obj)

覆盖:

equals 在类中 java.lang.Object