Java Arrays Class

Introduction

The Java Arrays class contains a static factory that allows to be viewed as . Following are the important points about Arrays −

This class contains various methods for manipulating arrays (such as sorting and searching).
The methods in this class throw a NullPointerException if the specified array reference is null.

Arrays Class Declaration

Following is the declaration for java.util.Arrays class −

public class Arrays
   extends Object

Arrays Class Methods

Sr.No.	Method & Description
1	This method returns a fixed-size list backed by the specified array.
2	This method searches the specified array of bytes for the specified value using the binary search algorithm.
3	This method searches the specified array of chars for the specified value using the binary search algorithm.
4	This method searches the specified array of doubles for the specified value using the binary search algorithm.
5	This method searches the specified array of floats for the specified value using the binary search algorithm.
6	This method searches the specified array of ints for the specified value using the binary search algorithm.
7	This method searches a range of the specified array of longs for the specified value using the binary search algorithm.
8	This method searches the specified array for the specified object using the binary search algorithm.
9	This method searches the specified array of shorts for the specified value using the binary search algorithm.
10	This method searches the specified array for the specified object using the binary search algorithm.
11	This method compares two boolean arrays lexicographically.
12	This method compares two byte arrays lexicographically.
13	This method compares two char arrays lexicographically.
14	This method compares two double arrays lexicographically.
15	This method compares two float arrays lexicographically.
16	This method compares two int arrays lexicographically.
17	This method compares two long arrays lexicographically.
18	This method compares two short arrays lexicographically.
19	This method compares two byte arrays lexicographically, numerically treating elements as unsigned.
20	This method compares two int arrays lexicographically, numerically treating elements as unsigned.
21	This method compares two long arrays lexicographically, numerically treating elements as unsigned.
22	This method compares two short arrays lexicographically, numerically treating elements as unsigned.
23	This method copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length.
24	This method copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length.
25	This method copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length.
26	This method copies the specified array, truncating or padding with false (if necessary) so the copy has the specified length.
27	This method copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
28	This method copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
29	This method copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
30	This method copies the specified array, truncating or padding with zeros (if necessary) so the copy has the specified length.
31	This method copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
32	This method copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
33	This method copies the specified range of the specified array into a new array.
34	This method copies the specified range of the specified array into a new array.
35	This method copies the specified range of the specified array into a new array.
36	This method copies the specified range of the specified array into a new array.
37	This method copies the specified range of the specified array into a new array.
38	This method copies the specified range of the specified array into a new array.
39	This method copies the specified range of the specified array into a new array.
40	This method copies the specified range of the specified array into a new array.
41	This method copies the specified range of the specified array into a new array.
42	This method returns true if the two specified arrays are deeply equal to one another.
43	This method returns a hash code based on the “deep contents” of the specified array.
44	This method returns a string representation of the “deep contents” of the specified array.
45	This method returns true if the two specified arrays of booleans are equal to one another.
46	This method returns true if the two specified arrays of bytes are equal to one another.
47	This method returns true if the two specified arrays of chars are equal to one another.
48	This method returns true if the two specified arrays of double are equal to one another.
49	This method returns true if the two specified arrays of floats are equal to one another.
50	This method returns true if the two specified arrays of ints are equal to one another.
51	This method returns true if the two specified arrays of longs are equal to one another.
52	This method returns true if the two specified arrays of shorts are equal to one another.
53	This method returns true if the two specified arrays of Objects are equal to one another.
54	This method returns true if the two specified arrays of Objects are equal to one another.
55	This method assigns the specified boolean value to each element of the specified array of booleans.
56	This method assigns the specified byte value to each element of the specified array of bytes.
57	This method assigns the specified char value to each element of the specified array of chars.
58	This method assigns the specified double value to each element of the specified array of doubles.
59	This method assigns the specified float value to each element of the specified array of floats.
60	This method assigns the specified int value to each element of the specified array of ints.
61	This method assigns the specified long value to each element of the specified array of longs.
62	This method assigns the specified Object reference to each element of the specified array of Objects.
63	This method assigns the specified short value to each element of the specified array of shorts.
64	This method returns a hash code based on the contents of the specified array.
65	This method finds and returns the index of the first mismatch between two boolean arrays, otherwise return -1 if no mismatch is found.
66	This method finds and returns the index of the first mismatch between two byte arrays, otherwise return -1 if no mismatch is found.
67	This method finds and returns the index of the first mismatch between two char arrays, otherwise return -1 if no mismatch is found.
68	This method finds and returns the index of the first mismatch between two double arrays, otherwise return -1 if no mismatch is found.
69	This method finds and returns the index of the first mismatch between two int arrays, otherwise return -1 if no mismatch is found.
70	This method finds and returns the index of the first mismatch between two long arrays, otherwise return -1 if no mismatch is found.
71	This method finds and returns the index of the first mismatch between two short arrays, otherwise return -1 if no mismatch is found.
72	This method finds and returns the index of the first mismatch between two object arrays, otherwise return -1 if no mismatch is found.
73	This method finds and returns the index of the first mismatch between two object arrays, otherwise return -1 if no mismatch is found.
74	This method cumulates, in parallel, each element of the given array in place, using the supplied function.
75	This method cumulates, in parallel, each element of the given array in place, using the supplied function.
76	This method cumulates, in parallel, each element of the given array in place, using the supplied function.
77	This method cumulates, in parallel, each element of the given array in place, using the supplied function.
78	This method sets all elements of the specified array, in parallel, using the provided generator function to compute each element.
79	This method sets all elements of the specified array, in parallel, using the provided generator function to compute each element.
80	This method sets all elements of the specified array, in parallel, using the provided generator function to compute each element.
81	This method sets all elements of the specified array, in parallel, using the provided generator function to compute each element.
82	This method sorts the specified array of bytes into ascending numerical order.
83	This method sorts the specified array of chars into ascending numerical order.
84	This method sorts the specified array of doubles into ascending numerical order.
85	This method sorts the specified array of floats into ascending numerical order.
86	This method sorts the specified array of ints into ascending numerical order.
87	This method sorts the specified array of longs into ascending numerical order.
88	This method sorts the specified array of shorts into ascending numerical order.
89	This method sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
90	This method sorts the specified array of objects into ascending order, according to the ordering provided by the Comparator instance.
91	This method sets all elements of the specified array, using the provided generator function to compute each element.
92	This method sets all elements of the specified array, using the provided generator function to compute each element.
93	This method sets all elements of the specified array, using the provided generator function to compute each element.
94	This method sets all elements of the specified array, using the provided generator function to compute each element.
95	This method returns a Spliterator.OfDouble covering all of the specified array.
96	This method returns a Spliterator.OfInt covering all of the specified array.
97	This method returns a Spliterator.OfLong covering all of the specified array.
98	This method returns a Spliterator covering all of the specified array.
99	This method returns a sequential DoubleStream with the specified array as its source.
100	This method returns a sequential IntStream with the specified array as its source.
101	This method returns a sequential LongStream with the specified array as its source.
102	This method returns a sequential Stream with the specified array as its source.
103	This method sorts the specified array of bytes into ascending numerical order.
104	This method sorts the specified array of chars into ascending numerical order.
105	This method sorts the specified array of doubles into ascending numerical order.
106	This method sorts the specified array of floats into ascending numerical order.
107	This method sorts the specified array of ints into ascending numerical order.
108	This method sorts the specified array of longs into ascending numerical order.
109	This method sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
110	This method sorts the specified array of shorts into ascending numerical order.
111	This method returns a string representation of the contents of the specified array of boolean.

Methods Inherited

This class inherits methods from the following classes −

java.util.Object

Arrays Class Example

This example demonstrates the binarySearch() method of Arrays class.

// Importing the Arrays class
import java.util.Arrays;

// Public Main Class
public class Main {
  public static void main(String[] args) {
    // Declaring an array
    int arr[] = {8, 5, 3, 10, 2, 1, 15, 20};

    // Sorting the array
    Arrays.sort(arr);

    // Taking an element to search
    int ele = 15;

    // Using binarySearch() method to search "ele"
    System.out.println(
      ele + " presents at the index = " +
      Arrays.binarySearch(arr, ele));
  }
}

Let us compile and run the above program, this will produce the following result −

15 presents at the index = 6

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Java Arrays Class

Introduction

Arrays Class Declaration

Arrays Class Methods

Methods Inherited

Arrays Class Example

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