How to determine whether an array contains a particular value in Java?

Java Array : Java provides a data structure, the array, which stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

So to determine or to check whether a value is contained by the array or not, we have so many solutions.

You can use ArrayUtils.contains from Apache Commons Lang

public static boolean contains(Object[] array, Object objectToFind)

Note that this method returns false if the passed array is null.

There are also methods available for primitive arrays of all kinds.

But after Java 8 introduction of stream api's and enhacements of java array its become easy to deal such situations.

Since java-8 you can now use Streams.

String[] values = {"AB","BC","CD","AE"};

boolean contains = Arrays.stream(values).anyMatch("s"::equals);

To check whether an array of int, double or long contains a value use IntStream, DoubleStream or LongStream respectively.

Example

int[] a = {1,2,3,4,5, 6,7};

boolean contains = IntStream.of(a).anyMatch(x -> x == 2);