In this tutorial, we will see “How to find Missing Number in an Array using Java 8 Streams?”
Find missing number in an array in java 8 using streams
Java 8 – How to find missing number in an array using Streams? Share on X
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | /** * Using Java 8, Find the missing number in an array * @author Deepak Verma * */ import java.util.Arrays; public class Find_Missing_Number_In_Array_Java8Stream_Example { public static void main(String args[]) { int[] arrayOfIntegers = {1, 2, 3, 4, 6, 7, 8, 9}; int maxValue = Arrays.stream(arrayOfIntegers).max().getAsInt(); int expectedSum = maxValue * (maxValue + 1) / 2; int actualSum = Arrays.stream(arrayOfIntegers).sum(); int missingNumber = expectedSum - actualSum; System.out.println("Missing number in the array is: " + missingNumber); } } |
Output:
1 | Missing number in the array is: 5 |
Find missing number in an array in java 8 using streams
In the above code, we use the Java 8 stream API and along with that, the max and sum methods to find the missing number in the provided array. The variable denotes by expectedSum holds the sum of all numbers from 1 to the maximum value in the given array. While on the other hand, the variables denotes by actualSum holds the sum of all numbers in the array. At last, the missing number is figured out by subtracting the actual sum value from the expected sum value.
Find missing number in an array in java 8 using streams
Java 8 – How to find missing number in an array using Streams? Share on X
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