In this tutorial, we will see “How to find the ‘FACTORIAL’ of an Integer using Java 8?” find factorial of integer using java 8
Java 8 – How to find ‘FACTORIAL’ of an Integer? Click To Tweet
Java 8 method:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /** * Find 'Factorial' of an Integer using Java 8 * @author Deepak Verma * */ import java.util.stream.LongStream; public class Find_Factorial_of_Integer_Java8_Example { public static void main(String[] args) { // Find the factorial of 5 long factorial = LongStream.rangeClosed(1, 5) .reduce(1, (long x, long y) -> x * y); System.out.println("Factorial of 5: "+factorial); } } |
Output:
1 | Factorial of 5: 120 |
find factorial of integer using java 8
This particular example uses the rangeClosed method of the LongStream class to generate a stream of integers ranging from 1 to 5, inclusive. Then, it uses the reduce method to perform a reduction on the stream, multiplying each element by the accumulator which is initially set to 1. Finally, the result of the reduction is the factorial of 5.
Traditional Java method:
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 | /** * Find 'Factorial' of an Integer using Java (Before 8) * @author Deepak Verma * */ package org.java8.examples; public class Find_Factorial_of_Integer_Java_Example { public static void main(String[] args) { // Find the factorial of 5 System.out.println("Factorial of 5: "+factorial(5)); } public static long factorial(long n) { if (n == 1) return 1; else return (n * factorial(n - 1)); } } |
Output:
1 | Factorial of 5: 120 |
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Java 8 – How to find ‘FACTORIAL’ of an Integer? Click To Tweet
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