public class BooleanArrays extends Object
In particular, the ensureCapacity(), grow(),
trim() and setLength() methods allow to handle
arrays much like array lists. This can be very useful when efficiency (or
syntactic simplicity) reasons make array lists unsuitable.
Note that com.uwyn.jhighlight.fastutil.io.BinIO and com.uwyn.jhighlight.fastutil.io.TextIO
contain several methods make it possible to load and save arrays of primitive types as sequences
of elements in DataInput format (i.e., not as objects) or as sequences of lines of text.
Arrays| 修飾子とタイプ | フィールドと説明 |
|---|---|
static boolean[] |
EMPTY_ARRAY
A static, final, empty array.
|
static Hash.Strategy<boolean[]> |
HASH_STRATEGY
A type-specific content-based hash strategy for arrays.
|
| 修飾子とタイプ | メソッドと説明 |
|---|---|
static boolean[] |
copy(boolean[] array)
Returns a copy of an array.
|
static boolean[] |
copy(boolean[] array,
int offset,
int length)
Returns a copy of a portion of an array.
|
static boolean[] |
ensureCapacity(boolean[] array,
int length)
Ensures that an array can contain the given number of entries.
|
static boolean[] |
ensureCapacity(boolean[] array,
int length,
int preserve)
Ensures that an array can contain the given number of entries, preserving just a part of the array.
|
static void |
ensureFromTo(boolean[] a,
int from,
int to)
Ensures that a range given by its first (inclusive) and last (exclusive) elements fits an array.
|
static void |
ensureOffsetLength(boolean[] a,
int offset,
int length)
Ensures that a range given by an offset and a length fits an array.
|
static boolean |
equals(boolean[] a1,
boolean[] a2)
推奨されていません。
Please use the corresponding
Arrays method, which is intrinsified in recent JVMs. |
static void |
fill(boolean[] array,
boolean value)
Fills the given array with the given value.
|
static void |
fill(boolean[] array,
int from,
int to,
boolean value)
Fills a portion of the given array with the given value.
|
static boolean[] |
grow(boolean[] array,
int length)
Grows the given array to the maximum between the given length and
the current length multiplied by two, provided that the given
length is larger than the current length.
|
static boolean[] |
grow(boolean[] array,
int length,
int preserve)
Grows the given array to the maximum between the given length and
the current length multiplied by two, provided that the given
length is larger than the current length, preserving just a part of the array.
|
static void |
mergeSort(boolean[] a)
Sorts an array according to the natural ascending order using mergesort.
|
static void |
mergeSort(boolean[] a,
BooleanComparator comp)
Sorts an array according to the order induced by the specified
comparator using mergesort.
|
static void |
mergeSort(boolean[] a,
int from,
int to)
Sorts the specified range of elements according to the natural ascending order using mergesort.
|
static void |
mergeSort(boolean[] a,
int from,
int to,
boolean[] supp)
Sorts the specified range of elements according to the natural ascending order using mergesort, using a given pre-filled support array.
|
static void |
mergeSort(boolean[] a,
int from,
int to,
BooleanComparator comp)
Sorts the specified range of elements according to the order induced by the specified
comparator using mergesort.
|
static void |
mergeSort(boolean[] a,
int from,
int to,
BooleanComparator comp,
boolean[] supp)
Sorts the specified range of elements according to the order induced by the specified
comparator using mergesort, using a given pre-filled support array.
|
static void |
quickSort(boolean[] x)
Sorts an array according to the natural ascending order using quicksort.
|
static void |
quickSort(boolean[] x,
BooleanComparator comp)
Sorts an array according to the order induced by the specified
comparator using quicksort.
|
static void |
quickSort(boolean[] x,
int from,
int to)
Sorts the specified range of elements according to the natural ascending order using quicksort.
|
static void |
quickSort(boolean[] x,
int from,
int to,
BooleanComparator comp)
Sorts the specified range of elements according to the order induced by the specified
comparator using quicksort.
|
static boolean[] |
reverse(boolean[] a)
Reverses the order of the elements in the specified array.
|
static boolean[] |
reverse(boolean[] a,
int from,
int to)
Reverses the order of the elements in the specified array fragment.
|
static boolean[] |
setLength(boolean[] array,
int length)
Sets the length of the given array.
|
static boolean[] |
shuffle(boolean[] a,
int from,
int to,
Random random)
Shuffles the specified array fragment using the specified pseudorandom number generator.
|
static boolean[] |
shuffle(boolean[] a,
Random random)
Shuffles the specified array using the specified pseudorandom number generator.
|
static boolean[] |
trim(boolean[] array,
int length)
Trims the given array to the given length.
|
public static final boolean[] EMPTY_ARRAY
public static final Hash.Strategy<boolean[]> HASH_STRATEGY
This hash strategy may be used in custom hash collections whenever keys are
arrays, and they must be considered equal by content. This strategy
will handle null correctly, and it is serializable.
public static boolean[] ensureCapacity(boolean[] array,
int length)
If you cannot foresee whether this array will need again to be
enlarged, you should probably use grow() instead.
array - an array.length - the new minimum length for this array.array, if it contains length entries or more; otherwise,
an array with length entries whose first array.length
entries are the same as those of array.public static boolean[] ensureCapacity(boolean[] array,
int length,
int preserve)
array - an array.length - the new minimum length for this array.preserve - the number of elements of the array that must be preserved in case a new allocation is necessary.array, if it can contain length entries or more; otherwise,
an array with length entries whose first preserve
entries are the same as those of array.public static boolean[] grow(boolean[] array,
int length)
If you want complete control on the array growth, you
should probably use ensureCapacity() instead.
array - an array.length - the new minimum length for this array.array, if it can contain length
entries; otherwise, an array with
max(length,array.length/φ) entries whose first
array.length entries are the same as those of array.public static boolean[] grow(boolean[] array,
int length,
int preserve)
If you want complete control on the array growth, you
should probably use ensureCapacity() instead.
array - an array.length - the new minimum length for this array.preserve - the number of elements of the array that must be preserved in case a new allocation is necessary.array, if it can contain length
entries; otherwise, an array with
max(length,array.length/φ) entries whose first
preserve entries are the same as those of array.public static boolean[] trim(boolean[] array,
int length)
array - an array.length - the new maximum length for the array.array, if it contains length
entries or less; otherwise, an array with
length entries whose entries are the same as
the first length entries of array.public static boolean[] setLength(boolean[] array,
int length)
array - an array.length - the new length for the array.array, if it contains exactly length
entries; otherwise, if it contains more than
length entries, an array with length entries
whose entries are the same as the first length entries of
array; otherwise, an array with length entries
whose first array.length entries are the same as those of
array.public static boolean[] copy(boolean[] array,
int offset,
int length)
array - an array.offset - the first element to copy.length - the number of elements to copy.length elements of array starting at offset.public static boolean[] copy(boolean[] array)
array - an array.array.public static void fill(boolean[] array,
boolean value)
This method uses a backward loop. It is significantly faster than the corresponding
method in Arrays.
array - an array.value - the new value for all elements of the array.public static void fill(boolean[] array,
int from,
int to,
boolean value)
If possible (i.e., from is 0) this method uses a
backward loop. In this case, it is significantly faster than the
corresponding method in Arrays.
array - an array.from - the starting index of the portion to fill (inclusive).to - the end index of the portion to fill (exclusive).value - the new value for all elements of the specified portion of the array.@Deprecated public static boolean equals(boolean[] a1, boolean[] a2)
Arrays method, which is intrinsified in recent JVMs.a1 - an array.a2 - another array.public static void ensureFromTo(boolean[] a,
int from,
int to)
This method may be used whenever an array range check is needed.
a - an array.from - a start index (inclusive).to - an end index (exclusive).IllegalArgumentException - if from is greater than to.ArrayIndexOutOfBoundsException - if from or to are greater than the array length or negative.public static void ensureOffsetLength(boolean[] a,
int offset,
int length)
This method may be used whenever an array range check is needed.
a - an array.offset - a start index.length - a length (the number of elements in the range).IllegalArgumentException - if length is negative.ArrayIndexOutOfBoundsException - if offset is negative or offset+length is greater than the array length.public static void quickSort(boolean[] x,
int from,
int to,
BooleanComparator comp)
The sorting algorithm is a tuned quicksort adapted from Jon L. Bentley and M. Douglas McIlroy, “Engineering a Sort Function”, Software: Practice and Experience, 23(11), pages 1249−1265, 1993.
Note that this implementation does not allocate any object, contrarily to the implementation
used to sort primitive types in Arrays, which switches to mergesort on large inputs.
x - the array to be sorted.from - the index of the first element (inclusive) to be sorted.to - the index of the last element (exclusive) to be sorted.comp - the comparator to determine the sorting order.public static void quickSort(boolean[] x,
BooleanComparator comp)
The sorting algorithm is a tuned quicksort adapted from Jon L. Bentley and M. Douglas McIlroy, “Engineering a Sort Function”, Software: Practice and Experience, 23(11), pages 1249−1265, 1993.
Note that this implementation does not allocate any object, contrarily to the implementation
used to sort primitive types in Arrays, which switches to mergesort on large inputs.
x - the array to be sorted.comp - the comparator to determine the sorting order.public static void quickSort(boolean[] x,
int from,
int to)
The sorting algorithm is a tuned quicksort adapted from Jon L. Bentley and M. Douglas McIlroy, “Engineering a Sort Function”, Software: Practice and Experience, 23(11), pages 1249−1265, 1993.
Note that this implementation does not allocate any object, contrarily to the implementation
used to sort primitive types in Arrays, which switches to mergesort on large inputs.
x - the array to be sorted.from - the index of the first element (inclusive) to be sorted.to - the index of the last element (exclusive) to be sorted.public static void quickSort(boolean[] x)
The sorting algorithm is a tuned quicksort adapted from Jon L. Bentley and M. Douglas McIlroy, “Engineering a Sort Function”, Software: Practice and Experience, 23(11), pages 1249−1265, 1993.
Note that this implementation does not allocate any object, contrarily to the implementation
used to sort primitive types in Arrays, which switches to mergesort on large inputs.
x - the array to be sorted.public static void mergeSort(boolean[] a,
int from,
int to,
boolean[] supp)
This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort. Moreover, no support arrays will be allocated.
a - the array to be sorted.from - the index of the first element (inclusive) to be sorted.to - the index of the last element (exclusive) to be sorted.supp - a support array containing at least to elements, and whose entries are identical to those
of a in the specified range.public static void mergeSort(boolean[] a,
int from,
int to)
This sort is guaranteed to be stable: equal elements will not be reordered as a result
of the sort. An array as large as a will be allocated by this method.
a - the array to be sorted.from - the index of the first element (inclusive) to be sorted.to - the index of the last element (exclusive) to be sorted.public static void mergeSort(boolean[] a)
This sort is guaranteed to be stable: equal elements will not be reordered as a result
of the sort. An array as large as a will be allocated by this method.
a - the array to be sorted.public static void mergeSort(boolean[] a,
int from,
int to,
BooleanComparator comp,
boolean[] supp)
This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort. Moreover, no support arrays will be allocated.
a - the array to be sorted.from - the index of the first element (inclusive) to be sorted.to - the index of the last element (exclusive) to be sorted.comp - the comparator to determine the sorting order.supp - a support array containing at least to elements, and whose entries are identical to those
of a in the specified range.public static void mergeSort(boolean[] a,
int from,
int to,
BooleanComparator comp)
This sort is guaranteed to be stable: equal elements will not be reordered as a result
of the sort. An array as large as a will be allocated by this method.
a - the array to be sorted.from - the index of the first element (inclusive) to be sorted.to - the index of the last element (exclusive) to be sorted.comp - the comparator to determine the sorting order.public static void mergeSort(boolean[] a,
BooleanComparator comp)
This sort is guaranteed to be stable: equal elements will not be reordered as a result
of the sort. An array as large as a will be allocated by this method.
a - the array to be sorted.comp - the comparator to determine the sorting order.public static boolean[] shuffle(boolean[] a,
int from,
int to,
Random random)
a - the array to be shuffled.from - the index of the first element (inclusive) to be shuffled.to - the index of the last element (exclusive) to be shuffled.random - a pseudorandom number generator (please use a XorShift* generator).a.public static boolean[] shuffle(boolean[] a,
Random random)
a - the array to be shuffled.random - a pseudorandom number generator (please use a XorShift* generator).a.public static boolean[] reverse(boolean[] a)
a - the array to be reversed.a.public static boolean[] reverse(boolean[] a,
int from,
int to)
a - the array to be reversed.from - the index of the first element (inclusive) to be reversed.to - the index of the last element (exclusive) to be reversed.a.Copyright © 2011-2015. All Rights Reserved.