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? Share on X
Java 8 method:
/**
* 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:
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:
/**
* 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:
Factorial of 5: 120
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Java 8 – How to find ‘FACTORIAL’ of an Integer? Share on X
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