Java.util.Arrays Class
Java Arrays Class
Java.util package provides a Arrays class which contains a static factory that allows arrays to be viewed as lists. The class contains various methods for manipulating arrays like sorting and searching. The methods in this class throw a NullPointerException, if the specified array reference is null.
Class declaration
The declaration of java.util.Arrays class is:
public class Arrays extends Object
java.util.Arrays Methods
The java.util.Arrays class has a number of methods which are listed below:
Member Methods
| S.N | Methods & Description |
|---|---|
| 1. |
static <T> List<T> asList(T...a) Returns a fixed-size list backed by the specified array. |
| 2. |
static int binarySearch(byte[] a, byte key) Searches the specified array of bytes for the specified value using the binary search algorithm. |
| 3. |
static int binarySearch(byte[] a, int fromIndex, int toIndex, byte key) Searches a range of the specified array of bytes for the specified value using the binary search algorithm. |
| 4. |
static int binarySearch(char[] a, char key) Searches the specified array of chars for the specified value using the binary search algorithm. |
| 5. |
static int binarySearch(char[] a, int fromIndex, int toIndex, char key) Searches a range of the specified array of chars for the specified value using the binary search algorithm. |
| 6. |
static int binarySearch(double[] a, double key) Searches the specified array of doubles for the specified value using the binary search algorithm. |
| 7. |
static int binarySearch(double[] a, int fromIndex, int toIndex, double key) Searches a range of the specified array of doubles for the specified value using the binary search algorithm. |
| 8. |
static int binarySearch(float[] a, float key) Searches the specified array of floats for the specified value using the binary search algorithm. |
| 9. |
static int binarySearch(float[] a, int fromIndex, int toIndex, float key) Searches a range of the specified array of floats for the specified value using the binary search algorithm. |
| 10. |
static int binarySearch(int[] a, int key) Searches the specified array of ints for the specified value using the binary search algorithm. |
| 11. |
static int binarySearch(int[] a, int fromIndex, int toIndex, int key) Searches a range of the specified array of ints for the specified value using the binary search algorithm. |
| 12. |
static int binarySearch(long[] a, long key) Searches the specified array of longs for the specified value using the binary search algorithm. |
| 13. |
static int binarySearch(long[] a, int fromIndex, int toIndex, long key) Searches a range of the specified array of longs for the specified value using the binary search algorithm. |
| 14. |
static int binarySearch(Object[] a, Object key) Searches the specified array for the specified object using the binary search algorithm. |
| 15. |
static int binarySearch(Object[] a, int fromIndex, int toIndex, Object key) Searches a range of the specified array for the specified object using the binary search algorithm. |
| 16. |
static int binarySearch(short[] a, short key) Searches the specified array of shorts for the specified value using the binary search algorithm. |
| 17. |
static int binarySearch(short[] a, int fromIndex, int toIndex, short key) Searches a range of the specified array of shorts for the specified value using the binary search algorithm. |
| 18. |
static <T> int binarySearch(T[] a, T key, Comparator<? super T> c) Searches the specified array for the specified object using the binary search algorithm. |
| 19. |
static <T> int binarySearch(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c) Searches a range of the specified array for the specified object using the binary search algorithm. |
| 20. |
static boolean[] copyOf(boolean[] original, int newLength) Copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length. |
| 21. |
static byte[] copyOf(byte[] original, int newLength) Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
| 22. |
static char[] copyOf(char[] original, int newLength) Copies the specified array, truncating or padding with null characters (if necessary) so the copy has the specified length. |
| 23. |
static double[] copyOf(double[] original, int newLength) Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
| 24. |
static float[] copyOf(float[] original, int newLength) Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
| 25. |
static int[] copyOf(int[] original, int newLength) Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
| 26. |
static long[] copyOf(long[] original, int newLength) Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
| 27. |
static short[] copyOf(short[] original, int newLength) Copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length. |
| 28. |
static <T> T[] copyOf(T[] original, int newLength) Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length. |
| 29. |
static <T,U> T[] copyOf(U[] original, int newLength, Class<? extends T[]> newType) Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length. |
| 30. |
static boolean[] copyOfRange(boolean[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 31. |
static byte[] copyOfRange(byte[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 32. |
static char[] copyOfRange(char[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 33. |
static double[] copyOfRange(double[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 34. |
static float[] copyOfRange(float[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 35. |
static int[] copyOfRange(int[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 36. |
static long[] copyOfRange(long[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 37. |
static short[] copyOfRange(short[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 38. |
static <T> T[] copyOfRange(T[] original, int from, int to) Copies the specified range of the specified array into a new array. |
| 39. |
static <T,U> T[] copyOfRange(U[] original, int from, int to, Class<? extends T[]> newType) Copies the specified range of the specified array into a new array. |
| 40. |
static boolean deepEquals(Object[] a1, Object[] a2) Returns true if the two specified arrays are deeply equal to one another. |
| 41. |
static int deepHashCode(Object[] a) Returns a hash code based on the "deep contents" of the specified array. |
| 42. |
static String deepToString(Object[] a) Returns a string representation of the "deep contents" of the specified array. |
| 43. |
static boolean equals(boolean[] a, boolean[] b) Returns true if the two specified arrays of booleans are equal to one another. |
| 44. |
static boolean equals(byte[] a, byte[] b) Returns true if the two specified arrays of bytes are equal to one another. |
| 45. |
static boolean equals(char[] a, char[] b) Returns true if the two specified arrays of chars are equal to one another. |
| 46. |
static boolean equals(double[] a, double[] b) Returns true if the two specified arrays of doubles are equal to one another. |
| 47. |
static boolean equals(float[] a, float[] b) Returns true if the two specified arrays of floats are equal to one another. |
| 48. |
static boolean equals(int[] a, int[] b) Returns true if the two specified arrays of ints are equal to one another. |
| 49. |
static boolean equals(long[] a, long[] b) Returns true if the two specified arrays of longs are equal to one another. |
| 50. |
static boolean equals(Object[] a, Object[] b) Returns true if the two specified arrays of Objects are equal to one another. |
| 51. |
static boolean equals(short[] a, short[] b) Returns true if the two specified arrays of shorts are equal to one another. |
| 52. |
static void fill(boolean[] a, boolean val) Assigns the specified boolean value to each element of the specified array of booleans. |
| 53. |
static void fill(boolean[] a, int fromIndex, int toIndex, boolean val) Assigns the specified boolean value to each element of the specified range of the specified array of booleans. |
| 54. |
static void fill(byte[] a, byte val) Assigns the specified byte value to each element of the specified array of bytes. |
| 55. |
static void fill(byte[] a, int fromIndex, int toIndex, byte val) Assigns the specified byte value to each element of the specified range of the specified array of bytes. |
| 56. |
static void fill(char[] a, char val) Assigns the specified char value to each element of the specified array of chars. |
| 57. |
static void fill(char[] a, int fromIndex, int toIndex, char val) Assigns the specified char value to each element of the specified range of the specified array of chars. |
| 58. |
static void fill(double[] a, double val) Assigns the specified double value to each element of the specified array of doubles. |
| 59. |
static void fill(double[] a, int fromIndex, int toIndex, double val) Assigns the specified double value to each element of the specified range of the specified array of doubles. |
| 60. |
static void fill(float[] a, float val) Assigns the specified float value to each element of the specified array of floats. |
| 61. |
static void fill(float[] a, int fromIndex, int toIndex, float val) Assigns the specified float value to each element of the specified range of the specified array of floats. |
| 62. |
static void fill(int[] a, int val) Assigns the specified int value to each element of the specified array of ints. |
| 63. |
static void fill(int[] a, int fromIndex, int toIndex, int val) Assigns the specified int value to each element of the specified range of the specified array of ints. |
| 64. |
static void fill(long[] a, long val) Assigns the specified long value to each element of the specified array of longs. |
| 65. |
static void fill(long[] a, int fromIndex, int toIndex, long val) Assigns the specified long value to each element of the specified range of the specified array of longs. |
| 66. |
static void fill(Object[] a, Object val) Assigns the specified Object reference to each element of the specified array of Objects. |
| 67. |
static void fill(Object[] a, int fromIndex, int toIndex,Object val) Assigns the specified Object reference to each element of the specified range of the specified array of Objects. |
| 68. |
static void fill(short[] a, short val) Assigns the specified short value to each element of the specified array of shorts. |
| 69. |
static void fill(short[] a, int fromIndex, int toIndex, short val) Assigns the specified short value to each element of the specified range of the specified array of shorts. |
| 70. |
static int hashCode(boolean[] a) Returns a hash code based on the contents of the specified array. |
| 71. |
static int hashCode(byte[] a) Returns a hash code based on the contents of the specified array. |
| 72. |
static int hashCode(char[] a) Returns a hash code based on the contents of the specified array. |
| 73. |
static int hashCode(double[] a) Returns a hash code based on the contents of the specified array. |
| 74. |
static int hashCode(float[] a) Returns a hash code based on the contents of the specified array. |
| 75. |
static int hashCode(int[] a) Returns a hash code based on the contents of the specified array. |
| 76. |
static int hashCode(long[] a) Returns a hash code based on the contents of the specified array. |
| 77. |
static int hashCode(Object[] a) Returns a hash code based on the contents of the specified array. |
| 78. |
static int hashCode(short[] a) Returns a hash code based on the contents of the specified array. |
| 79. |
static void parallelPrefix(double[] array, DoubleBinaryOperator op) Cumulates, in parallel, each element of the given array in place, using the supplied function. |
| 80. |
static void parallelPrefix(double[] array, int fromIndex, int toIndex, DoubleBinaryOperator op) Performs parallelPrefix(double[], DoubleBinaryOperator) for the given subrange of the array. |
| 81. |
static void parallelPrefix(int[] array, IntBinaryOperator op) Cumulates, in parallel, each element of the given array in place, using the supplied function. |
| 82. |
static void parallelPrefix(int[] array, int fromIndex, int toIndex, IntBinaryOperator op) Performs parallelPrefix(int[], IntBinaryOperator) for the given subrange of the array. |
| 83. |
static void parallelPrefix(long[] array, LongBinaryOperator op) Cumulates, in parallel, each element of the given array in place, using the supplied function. |
| 84. |
static void parallelPrefix(long[] array, int fromIndex, int toIndex, LongBinaryOperator op) Performs parallelPrefix(long[], LongBinaryOperator) for the given subrange of the array. |
| 85. |
static <T> void parallelPrefix(T[] array, BinaryOperator<T> op) Cumulates, in parallel, each element of the given array in place, using the supplied function. |
| 86. |
static <T> void parallelPrefix(T[] array, int fromIndex, int toIndex, BinaryOperator<T> op) Performs parallelPrefix(Object[], BinaryOperator) for the given subrange of the array. |
| 87. |
static void parallelSetAll(double[] array, IntToDoubleFunction generator) Set all elements of the specified array, in parallel, using the provided generator function to compute each element. |
| 88. |
static void parallelSetAll(int[] array, IntUnaryOperator generator) Set all elements of the specified array, in parallel, using the provided generator function to compute each element. |
| 89. |
static void parallelSetAll(long[] array, IntToLongFunction generator) Set all elements of the specified array, in parallel, using the provided generator function to compute each element. |
| 90. |
static <T> void parallelSetAll(T[] array, IntFunction<? extends T> generator) Set all elements of the specified array, in parallel, using the provided generator function to compute each element. |
| 91. |
static void parallelSort(byte[] a) Sorts the specified array into ascending numerical order. |
| 92. |
static void parallelSort(byte[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 93. |
static void parallelSort(char[] a) Sorts the specified array into ascending numerical order. |
| 94. |
static void parallelSort(char[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 95. |
static void parallelSort(double[] a) Sorts the specified array into ascending numerical order. |
| 96. |
static void parallelSort(double[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 97. |
static void parallelSort(float[] a) Sorts the specified array into ascending numerical order. |
| 98. |
static void parallelSort(float[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 99. |
static void parallelSort(int[] a) Sorts the specified array into ascending numerical order. |
| 100. |
static void parallelSort(int[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 101. |
static void parallelSort(long[] a) Sorts the specified array into ascending numerical order. |
| 102. |
static void parallelSort(long[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 103. |
static void parallelSort(short[] a) Sorts the specified array into ascending numerical order. |
| 104. |
static void parallelSort(short[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending numerical order. |
| 105. |
static <T extends Comparable<? super T>> void parallelSort(T[] a) Sorts the specified array of objects into ascending order, according to the natural ordering of its elements. |
| 106. |
static <T> void parallelSort(T[] a, Comparator<? super T> cmp) Sorts the specified array of objects according to the order induced by the specified comparator. |
| 107. |
static <T extends Comparable<? super T>> void parallelSort(T[] a, int fromIndex, int toIndex) Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements. |
| 108. |
static <T> void parallelSort(T[] a, int fromIndex, int toIndex, Comparator<? super T> cmp) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator. |
| 109. |
static void setAll(double[] array, IntToDoubleFunction generator) Set all elements of the specified array, using the provided generator function to compute each element. |
| 110. |
static void setAll(int[] array, IntUnaryOperator generator) Set all elements of the specified array, using the provided generator function to compute each element. |
| 111. |
static void setAll(long[] array, IntToLongFunction generator) Set all elements of the specified array, using the provided generator function to compute each element. |
| 112. |
static <T> void setAll(T[] array, IntFunction<? extends T> generator) Set all elements of the specified array, using the provided generator function to compute each element. |
| 113. |
static void sort(byte[] a) Sorts the specified array into ascending numerical order. |
| 114. |
static void sort(byte[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 115. |
static void sort(char[] a) Sorts the specified array into ascending numerical order. |
| 116. |
static void sort(char[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 117. |
static void sort(double[] a) Sorts the specified array into ascending numerical order. |
| 118. |
static void sort(double[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 119. |
static void sort(float[] a) Sorts the specified array into ascending numerical order. |
| 120. |
static void sort(float[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 121. |
static void sort(int[] a) Sorts the specified array into ascending numerical order. |
| 122. |
static void sort(int[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 123. |
static void sort(long[] a) Sorts the specified array into ascending numerical order. |
| 124. |
static void sort(long[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 125. |
static void sort(Object[] a) Sorts the specified array of objects into ascending order, according to the natural ordering of its elements. |
| 126. |
static void sort(Object[] a, int fromIndex, int toIndex) Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements. |
| 127. |
static void sort(short[] a) Sorts the specified array into ascending numerical order. |
| 128. |
static void sort(short[] a, int fromIndex, int toIndex) Sorts the specified range of the array into ascending order. |
| 129. |
static <T> void sort(T[] a, Comparator<? super T> c) Sorts the specified array of objects according to the order induced by the specified comparator. |
| 130. |
static <T> void sort(T[] a, int fromIndex, int toIndex, Comparator<? super T> c) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator. |
| 131. |
static Spliterator.OfDouble spliterator(double[] array) Returns a Spliterator.OfDouble covering all of the specified array. |
| 132. |
static Spliterator.OfDouble spliterator(double[] array, int startInclusive, int endExclusive) Returns a Spliterator.OfDouble covering the specified range of the specified array. |
| 133. |
static Spliterator.OfInt spliterator(int[] array) Returns a Spliterator.OfInt covering all of the specified array. |
| 134. |
static Spliterator.OfInt spliterator(int[] array, int startInclusive, int endExclusive) Returns a Spliterator.OfInt covering the specified range of the specified array. |
| 135. |
static Spliterator.OfLong spliterator(long[] array) Returns a Spliterator.OfLong covering all of the specified array. |
| 136. |
static Spliterator.OfLong spliterator(long[] array, int startInclusive, int endExclusive) Returns a Spliterator.OfLong covering the specified range of the specified array. |
| 137. |
static <T> Spliterator<T> spliterator(T[] array) Returns a Spliterator covering all of the specified array. |
| 138. |
static <T> Spliterator<T> spliterator(T[] array, int startInclusive, int endExclusive) Returns a Spliterator covering the specified range of the specified array. |
| 139. |
static DoubleStream stream(double[] array) Returns a sequential DoubleStream with the specified array as its source. |
| 140. |
static DoubleStream stream(double[] array, int startInclusive, int endExclusive) Returns a sequential DoubleStream with the specified range of the specified array as its source. |
| 141. |
static IntStream stream(int[] array) Returns a sequential IntStream with the specified array as its source. |
| 142. |
static IntStream stream(int[] array, int startInclusive, int endExclusive) Returns a sequential IntStream with the specified range of the specified array as its source. |
| 143. |
static LongStream stream(long[] array) Returns a sequential LongStream with the specified array as its source. |
| 144. |
static LongStream stream(long[] array, int startInclusive, int endExclusive) Returns a sequential LongStream with the specified range of the specified array as its source. |
| 145. |
static <T> Stream<T> stream(T[] array) Returns a sequential Stream with the specified array as its source. |
| 146. |
static <T> Stream<T> stream(T[] array, int startInclusive, int endExclusive) Returns a sequential Stream with the specified range of the specified array as its source. |
| 147. |
static String toString(boolean[] a) Returns a string representation of the contents of the specified array. |
| 148. |
static String toString(byte[] a) Returns a string representation of the contents of the specified array. |
| 149. |
static String toString(char[] a) Returns a string representation of the contents of the specified array. |
| 150. |
static String toString(double[] a) Returns a string representation of the contents of the specified array. |
| 151. |
static String toString(float[] a) Returns a string representation of the contents of the specified array. |
| 152. |
static String toString(int[] a) Returns a string representation of the contents of the specified array. |
| 153. |
static String toString(long[] a) Returns a string representation of the contents of the specified array. |
| 154. |
static String toString(Object[] a) Returns a string representation of the contents of the specified array. |
| 155. |
static String toString(short[] a) Returns a string representation of the contents of the specified array. |
Methods inherited
This class inherits the methods of following class:
- java.lang.Object
