java.util

Class Arrays

java.lang.Object
- java.util.Arrays

public class Arrays

extends Object

This class contains various static utility methods performing operations on arrays, and a method to provide a List "view" of an array to facilitate using arrays with Collection-based APIs. All methods throw a NullPointerException if the parameter array is null.

Implementations may use their own algorithms, but must obey the general properties; for example, the sort must be stable and n*log(n) complexity. Sun's implementation of sort, and therefore ours, is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Since:: 1.2

See Also:: Comparable, Comparator

Method Summary
`static`	`List asList(T... a)` Returns a list "view" of the specified array.
`static`	`T[] copyOf(T[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `null` to obtain the specified length.
`static`	`T[] copyOf(U[] original, int newLength, >[] newType)` Returns a copy of the supplied array, truncating or padding as necessary with `null` to obtain the specified length.
`static`	`T[] copyOfRange(T[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `null` if `to` is greater than the length of the original array.
`static`	`T[] copyOfRange(U[] original, int from, int to, >[] newType)` Copies the specified range of the supplied array to a new array, padding as necessary with `null` if `to` is greater than the length of the original array.
`static int`	`binarySearch(byte[] a, byte key)` Perform a binary search of a byte array for a key.
`static int`	`binarySearch(byte[] a, int low, int hi, byte key)` Perform a binary search of a range of a byte array for a key.
`static int`	`binarySearch(char[] a, char key)` Perform a binary search of a char array for a key.
`static int`	`binarySearch(char[] a, int low, int hi, char key)` Perform a binary search of a range of a char array for a key.
`static int`	`binarySearch(double[] a, double key)` Perform a binary search of a double array for a key.
`static int`	`binarySearch(double[] a, int low, int hi, double key)` Perform a binary search of a range of a double array for a key.
`static int`	`binarySearch(float[] a, float key)` Perform a binary search of a float array for a key.
`static int`	`binarySearch(float[] a, int low, int hi, float key)` Perform a binary search of a range of a float array for a key.
`static int`	`binarySearch(int[] a, int key)` Perform a binary search of an int array for a key.
`static int`	`binarySearch(int[] a, int low, int hi, int key)` Perform a binary search of a range of an integer array for a key.
`static int`	`binarySearch(Object[] a, int low, int hi, Object key)` Perform a binary search of a range of an Object array for a key.
`static int`	`binarySearch(Object[] a, Object key)` Perform a binary search of an Object array for a key, using the natural ordering of the elements.
`static int`	`binarySearch(long[] a, int low, int hi, long key)` Perform a binary search of a range of a long array for a key.
`static int`	`binarySearch(long[] a, long key)` Perform a binary search of a long array for a key.
`static int`	`binarySearch(short[] a, int low, int hi, short key)` Perform a binary search of a range of a short array for a key.
`static int`	`binarySearch(short[] a, short key)` Perform a binary search of a short array for a key.
`static boolean[]`	`copyOf(boolean[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `false` to obtain the specified length.
`static byte[]`	`copyOf(byte[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `(byte)0` to obtain the specified length.
`static char[]`	`copyOf(char[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `'\0'` to obtain the specified length.
`static double[]`	`copyOf(double[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `0d` to obtain the specified length.
`static float[]`	`copyOf(float[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `0f` to obtain the specified length.
`static int[]`	`copyOf(int[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `0` to obtain the specified length.
`static long[]`	`copyOf(long[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `0L` to obtain the specified length.
`static short[]`	`copyOf(short[] original, int newLength)` Returns a copy of the supplied array, truncating or padding as necessary with `(short)0` to obtain the specified length.
`static boolean[]`	`copyOfRange(boolean[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `false` if `to` is greater than the length of the original array.
`static byte[]`	`copyOfRange(byte[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `(byte)0` if `to` is greater than the length of the original array.
`static char[]`	`copyOfRange(char[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `'\0'` if `to` is greater than the length of the original array.
`static double[]`	`copyOfRange(double[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `0d` if `to` is greater than the length of the original array.
`static float[]`	`copyOfRange(float[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `0f` if `to` is greater than the length of the original array.
`static int[]`	`copyOfRange(int[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `0` if `to` is greater than the length of the original array.
`static long[]`	`copyOfRange(long[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `0L` if `to` is greater than the length of the original array.
`static short[]`	`copyOfRange(short[] original, int from, int to)` Copies the specified range of the supplied array to a new array, padding as necessary with `(short)0` if `to` is greater than the length of the original array.
`static boolean`	`deepEquals(Object[] v1, Object[] v2)`
`static int`	`deepHashCode(Object[] v)`
`static String`	`deepToString(Object[] v)`
`static boolean`	`equals(boolean[] a1, boolean[] a2)` Compare two boolean arrays for equality.
`static boolean`	`equals(byte[] a1, byte[] a2)` Compare two byte arrays for equality.
`static boolean`	`equals(char[] a1, char[] a2)` Compare two char arrays for equality.
`static boolean`	`equals(double[] a1, double[] a2)` Compare two double arrays for equality.
`static boolean`	`equals(float[] a1, float[] a2)` Compare two float arrays for equality.
`static boolean`	`equals(int[] a1, int[] a2)` Compare two int arrays for equality.
`static boolean`	`equals(Object[] a1, Object[] a2)` Compare two Object arrays for equality.
`static boolean`	`equals(long[] a1, long[] a2)` Compare two long arrays for equality.
`static boolean`	`equals(short[] a1, short[] a2)` Compare two short arrays for equality.
`static void`	`fill(boolean[] a, boolean val)` Fill an array with a boolean value.
`static void`	`fill(boolean[] a, int fromIndex, int toIndex, boolean val)` Fill a range of an array with a boolean value.
`static void`	`fill(byte[] a, byte val)` Fill an array with a byte value.
`static void`	`fill(byte[] a, int fromIndex, int toIndex, byte val)` Fill a range of an array with a byte value.
`static void`	`fill(char[] a, char val)` Fill an array with a char value.
`static void`	`fill(char[] a, int fromIndex, int toIndex, char val)` Fill a range of an array with a char value.
`static void`	`fill(double[] a, double val)` Fill an array with a double value.
`static void`	`fill(double[] a, int fromIndex, int toIndex, double val)` Fill a range of an array with a double value.
`static void`	`fill(float[] a, float val)` Fill an array with a float value.
`static void`	`fill(float[] a, int fromIndex, int toIndex, float val)` Fill a range of an array with a float value.
`static void`	`fill(int[] a, int val)` Fill an array with an int value.
`static void`	`fill(int[] a, int fromIndex, int toIndex, int val)` Fill a range of an array with an int value.
`static void`	`fill(Object[] a, int fromIndex, int toIndex, Object val)` Fill a range of an array with an Object value.
`static void`	`fill(Object[] a, Object val)` Fill an array with an Object value.
`static void`	`fill(long[] a, int fromIndex, int toIndex, long val)` Fill a range of an array with a long value.
`static void`	`fill(long[] a, long val)` Fill an array with a long value.
`static void`	`fill(short[] a, int fromIndex, int toIndex, short val)` Fill a range of an array with a short value.
`static void`	`fill(short[] a, short val)` Fill an array with a short value.
`static int`	`hashCode(boolean[] v)` Returns the hashcode of an array of booleans.
`static int`	`hashCode(byte[] v)` Returns the hashcode of an array of bytes.
`static int`	`hashCode(char[] v)` Returns the hashcode of an array of characters.
`static int`	`hashCode(double[] v)` Returns the hashcode of an array of doubles.
`static int`	`hashCode(float[] v)` Returns the hashcode of an array of floats.
`static int`	`hashCode(int[] v)` Returns the hashcode of an array of integer numbers.
`static int`	`hashCode(Object[] v)` Returns the hashcode of an array of objects.
`static int`	`hashCode(long[] v)` Returns the hashcode of an array of long numbers.
`static int`	`hashCode(short[] v)` Returns the hashcode of an array of short numbers.
`static`	`int binarySearch(T[] a, T key, T> c)` Perform a binary search of an Object array for a key, using a supplied Comparator.
`static`	`int binarySearch(T[] a, int low, int hi, T key, T> c)` Perform a binary search of a range of an Object array for a key using a `Comparator`.
`static void`	`sort(byte[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(byte[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(char[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(char[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(double[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(double[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(float[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(float[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(int[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(int[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(Object[] a)` Sort an array of Objects according to their natural ordering.
`static void`	`sort(Object[] a, int fromIndex, int toIndex)` Sort an array of Objects according to their natural ordering.
`static void`	`sort(long[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(long[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(short[] a)` Performs a stable sort on the elements, arranging them according to their natural order.
`static void`	`sort(short[] a, int fromIndex, int toIndex)` Performs a stable sort on the elements, arranging them according to their natural order.
`static String`	`toString(boolean[] v)` Returns a String representation of the argument array.
`static String`	`toString(byte[] v)` Returns a String representation of the argument array.
`static String`	`toString(char[] v)` Returns a String representation of the argument array.
`static String`	`toString(double[] v)` Returns a String representation of the argument array.
`static String`	`toString(float[] v)` Returns a String representation of the argument array.
`static String`	`toString(int[] v)` Returns a String representation of the argument array.
`static String`	`toString(Object[] v)` Returns a String representation of the argument array.
`static String`	`toString(long[] v)` Returns a String representation of the argument array.
`static String`	`toString(short[] v)` Returns a String representation of the argument array.
`static`	`void sort(T[] a, T> c)` Sort an array of Objects according to a Comparator.
`static`	`void sort(T[] a, int fromIndex, int toIndex, T> c)` Sort an array of Objects according to a Comparator.

Methods inherited from class java.lang.Object
`clone`, `equals`, `extends Object> getClass`, `finalize`, `hashCode`, `notify`, `notifyAll`, `toString`, `wait`, `wait`, `wait`

List asList

public static  List asList(T... a)

Returns a list "view" of the specified array. This method is intended to make it easy to use the Collections API with existing array-based APIs and programs. Changes in the list or the array show up in both places. The list does not support element addition or removal, but does permit value modification. The returned list implements both Serializable and RandomAccess.
Parameters:
a - the array to return a view of (null not permitted)
Returns:
a fixed-size list, changes to which "write through" to the array
Throws:
NullPointerException - if a is null.
See Also:
Serializable, RandomAccess, Arrays.ArrayList

T[] copyOf

public static  T[] copyOf(T[] original,
                             int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with null to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return null. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with null to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(T[],int,int)

T[] copyOf

public static  T[] copyOf(U[] original,
                               int newLength,
                               >[] newType)

Returns a copy of the supplied array, truncating or padding as necessary with null to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return null. This is equivalent to calling copyOfRange(original, 0, newLength, newType). The returned array will be of the specified type, newType.
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
newType - the type of the returned array.
Returns:
a copy of the original array, truncated or padded with null to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(U[],int,int,Class)

T[] copyOfRange

public static  T[] copyOfRange(T[] original,
                                  int from,
                                  int to)

Copies the specified range of the supplied array to a new array, padding as necessary with null if to is greater than the length of the original array. from must be in the range zero to original.length and can not be greater than to. The initial element of the returned array will be equal to original[from], except where from is equal to to (where a zero-length array will be returned) or from is equal to original.length (where an array padded with null will be returned). The returned array is always of length to - from.
Parameters:
original - the array from which to copy.
from - the initial index of the range, inclusive.
to - the final index of the range, exclusive.
Returns:
a copy of the specified range, with padding to obtain the required length.
Throws:
ArrayIndexOutOfBoundsException - if from <320 or from > original.length
IllegalArgumentException - if from > to
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOf(T[],int)

T[] copyOfRange

public static  T[] copyOfRange(U[] original,
                                    int from,
                                    int to,
                                    >[] newType)

Copies the specified range of the supplied array to a new array, padding as necessary with null if to is greater than the length of the original array. from must be in the range zero to original.length and can not be greater than to. The initial element of the returned array will be equal to original[from], except where from is equal to to (where a zero-length array will be returned) or from is equal to original.length (where an array padded with null will be returned). The returned array is always of length to - from and will be of the specified type, newType.
Parameters:
original - the array from which to copy.
from - the initial index of the range, inclusive.
to - the final index of the range, exclusive.
newType - the type of the returned array.
Returns:
a copy of the specified range, with padding to obtain the required length.
Throws:
ArrayIndexOutOfBoundsException - if from <320 or from > original.length
IllegalArgumentException - if from > to
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOf(T[],int)

binarySearch

public static int binarySearch(byte[] a,
                               byte key)

Perform a binary search of a byte array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(byte[] a,
                               int low,
                               int hi,
                               byte key)

Perform a binary search of a range of a byte array for a key. The range must be sorted (as by the sort(byte[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(char[] a,
                               char key)

Perform a binary search of a char array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(char[] a,
                               int low,
                               int hi,
                               char key)

Perform a binary search of a range of a char array for a key. The range must be sorted (as by the sort(char[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(double[] a,
                               double key)

Perform a binary search of a double array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(double[] a,
                               int low,
                               int hi,
                               double key)

Perform a binary search of a range of a double array for a key. The range must be sorted (as by the sort(double[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(float[] a,
                               float key)

Perform a binary search of a float array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(float[] a,
                               int low,
                               int hi,
                               float key)

Perform a binary search of a range of a float array for a key. The range must be sorted (as by the sort(float[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(int[] a,
                               int key)

Perform a binary search of an int array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(int[] a,
                               int low,
                               int hi,
                               int key)

Perform a binary search of a range of an integer array for a key. The range must be sorted (as by the sort(int[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(Object[] a,
                               int low,
                               int hi,
                               Object key)

Perform a binary search of a range of an Object array for a key. The range must be sorted (as by the sort(Object[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(Object[] a,
                               Object key)

Perform a binary search of an Object array for a key, using the natural ordering of the elements. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. Further, the key must be comparable with every item in the array. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this (JCL) implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
ClassCastException - if key could not be compared with one of the elements of a
NullPointerException - if a null element in a is compared

binarySearch

public static int binarySearch(long[] a,
                               int low,
                               int hi,
                               long key)

Perform a binary search of a range of a long array for a key. The range must be sorted (as by the sort(long[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(long[] a,
                               long key)

Perform a binary search of a long array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

binarySearch

public static int binarySearch(short[] a,
                               int low,
                               int hi,
                               short key)

Perform a binary search of a range of a short array for a key. The range must be sorted (as by the sort(short[], int, int) method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
low - the lowest index to search from.
hi - the highest index to search to.
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.
Throws:
IllegalArgumentException - if low > hi
ArrayIndexOutOfBoundsException - if low <320 or hi > a.length.

binarySearch

public static int binarySearch(short[] a,
                               short key)

Perform a binary search of a short array for a key. The array must be sorted (as by the sort() method) - if it is not, the behaviour of this method is undefined, and may be an infinite loop. If the array contains the key more than once, any one of them may be found. Note: although the specification allows for an infinite loop if the array is unsorted, it will not happen in this implementation.
Parameters:
a - the array to search (must be sorted)
key - the value to search for
Returns:
the index at which the key was found, or -n-1 if it was not found, where n is the index of the first value higher than key or a.length if there is no such value.

copyOf

public static boolean[] copyOf(boolean[] original,
                               int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with false to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return false. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with false to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(boolean[],int,int)

copyOf

public static byte[] copyOf(byte[] original,
                            int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with (byte)0 to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return (byte)0. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with (byte)0 to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(byte[],int,int)

copyOf

public static char[] copyOf(char[] original,
                            int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with '\0' to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return '\0'. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with '\0' to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(char[],int,int)

copyOf

public static double[] copyOf(double[] original,
                              int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with 0d to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return 0d. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with 0d to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(double[],int,int)

copyOf

public static float[] copyOf(float[] original,
                             int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with 0f to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return 0f. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with 0f to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(float[],int,int)

copyOf

public static int[] copyOf(int[] original,
                           int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with 0 to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return 0. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with 0 to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(int[],int,int)

copyOf

public static long[] copyOf(long[] original,
                            int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with 0L to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return 0L. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with 0L to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(long[],int,int)

copyOf

public static short[] copyOf(short[] original,
                             int newLength)

Returns a copy of the supplied array, truncating or padding as necessary with (short)0 to obtain the specified length. Indices that are valid for both arrays will return the same value. Indices that only exist in the returned array (due to the new length being greater than the original length) will return (short)0. This is equivalent to calling copyOfRange(original, 0, newLength).
Parameters:
original - the original array to be copied.
newLength - the length of the returned array.
Returns:
a copy of the original array, truncated or padded with (short)0 to obtain the required length.
Throws:
NegativeArraySizeException - if newLength is negative.
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOfRange(short[],int,int)

copyOfRange

public static boolean[] copyOfRange(boolean[] original,
                                    int from,
                                    int to)

Copies the specified range of the supplied array to a new array, padding as necessary with false if to is greater than the length of the original array. from must be in the range zero to original.length and can not be greater than to. The initial element of the returned array will be equal to original[from], except where from is equal to to (where a zero-length array will be returned) or from is equal to original.length (where an array padded with false will be returned). The returned array is always of length to - from.
Parameters:
original - the array from which to copy.
from - the initial index of the range, inclusive.
to - the final index of the range, exclusive.
Returns:
a copy of the specified range, with padding to obtain the required length.
Throws:
ArrayIndexOutOfBoundsException - if from <320 or from > original.length
IllegalArgumentException - if from > to
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOf(boolean[],int)

copyOfRange

public static byte[] copyOfRange(byte[] original,
                                 int from,
                                 int to)

Copies the specified range of the supplied array to a new array, padding as necessary with (byte)0 if to is greater than the length of the original array. from must be in the range zero to original.length and can not be greater than to. The initial element of the returned array will be equal to original[from], except where from is equal to to (where a zero-length array will be returned) or from is equal to original.length (where an array padded with (byte)0 will be returned). The returned array is always of length to - from.
Parameters:
original - the array from which to copy.
from - the initial index of the range, inclusive.
to - the final index of the range, exclusive.
Returns:
a copy of the specified range, with padding to obtain the required length.
Throws:
ArrayIndexOutOfBoundsException - if from <320 or from > original.length
IllegalArgumentException - if from > to
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOf(byte[],int)

copyOfRange

public static char[] copyOfRange(char[] original,
                                 int from,
                                 int to)

Copies the specified range of the supplied array to a new array, padding as necessary with '\0' if to is greater than the length of the original array. from must be in the range zero to original.length and can not be greater than to. The initial element of the returned array will be equal to original[from], except where from is equal to to (where a zero-length array will be returned) or from is equal to original.length (where an array padded with '\0' will be returned). The returned array is always of length to - from.
Parameters:
original - the array from which to copy.
from - the initial index of the range, inclusive.
to - the final index of the range, exclusive.
Returns:
a copy of the specified range, with padding to obtain the required length.
Throws:
ArrayIndexOutOfBoundsException - if from <320 or from > original.length
IllegalArgumentException - if from > to
NullPointerException - if original is null.
Since:
1.6
See Also:
copyOf(char[],int)

copyOfRange

public static double[] copyOfRange(double[] original,
                                   int from,
                                   int to)

Copies the specified range of the supplied array to a new array, padding as necessary with 0d if to is greater than the length of the original array. from must be in the range zero to original.length and can not be greater than to. The initial element of the returned array will be equal to original[from], except where from is equal to to (where a zero-length array will be returned) or from is equal to original.length (where an array padded with 0d will be returned). The returned array is always of length to - from.
Parameters:
original - the array from which to copy.
from - the initial index of the range, inclusive.
to - the final index of the range, exclusive.
Returns:
a copy of the specified range, with padding to obtain the required length.
Throws:
ArrayIndexOutOfBoundsException - if from <320 or from > original.length
IllegalArgumentException - if from > to
NullPointerException - if original is null.
Since:
1.6

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java.util

Class Arrays

Method Summary

Methods inherited from class java.lang.Object

Method Details

List asList

T[] copyOf

T[] copyOf

T[] copyOfRange

T[] copyOfRange

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

binarySearch

copyOf

copyOf

copyOf

copyOf

copyOf

copyOf

copyOf

copyOf

copyOfRange

copyOfRange

copyOfRange

copyOfRange