In this tutorial, we will see “How to find common elements of two arrays using Java 8 Streams?”find common elements of two arrays using Java 8 Stream
Java 8 – How to find common elements in two arrays using Streams? Click To Tweet
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | /** * Find the common elements of two arrays in Java 8 * @author Deepak Verma * */ import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class Find_common_elements_of_two_arrays_using_Java8 { public static void main(String[] args) { int[] arrayOfIntegers1 = {1, 2, 3, 4, 5}; int[] arrayOfIntegers2 = {4, 5, 6, 7, 8}; List<Integer> listOfInteger1 = Arrays.stream(arrayOfIntegers1) .boxed() .collect(Collectors.toList()); List<Integer> listOfInteger2 = Arrays.stream(arrayOfIntegers2) .boxed() .collect(Collectors.toList()); List<Integer> commonElements = listOfInteger1.stream() .filter(listOfInteger2::contains) .collect(Collectors.toList()); System.out.println("Array1: " +Arrays.toString(arrayOfIntegers1)); System.out.println("Array2: " +Arrays.toString(arrayOfIntegers2)); System.out.println("Common elements in both arrays: " + commonElements); } } |
Output:
1 2 3 | Array1: [1, 2, 3, 4, 5] Array2: [4, 5, 6, 7, 8] Common elements in both arrays: [4, 5] |
find common elements of two arrays using Java 8 Streams
As per above example, It first converts the arrays into lists using Arrays.stream(), then converts the primitive int arrays into integer objects using boxed(). After that, The resulting lists are filtered using the filter() method, which only keeps the elements that are also present in listOfInteger2 using the contains predicate. At last, the common elements are collected into a new list using the collect()method.
Java 8 – How to find common elements in two arrays using Streams? Click To Tweet
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