In this post, we will see “How to check odd or even numbers within a certain range using Java 8 Streams API”.
Easiest representation of Java 8 Streams power to test Odd or Even numbers within a certain range...!!! Share on X
Let’s say: In this particular example, we are extracting the odd and even numbers within the range of 10 to 25
Note: you can specify any range you would like to check for in place of the one we used in this example.
Example
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 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | import java.util.stream.*; public class CheckOddOrEvenNumberWithinRangeJava8 { public static void main(String args[]) { retrieveOddNumbersWithinRange(10, 25); retrieveEvenNumbersWithinRange(10, 25); } public static void retrieveOddNumbersWithinRange(int start, int end) { System.out.println("ODD NUMBERS WITHIN THE RANGE OF 10 AND 25"); //1st way System.out.println("\n 1st way: \n"); IntStream.range(start, end + 1).filter(i - > i % 2 != 0).forEach(System.out::println); //2nd way (traditional way - before java 8) System.out.println("\n 2nd way: \n"); for (int i = start; i <= end; i++) { if (i % 2 != 0) { System.out.println(i); } } //3rd way System.out.println("\n 3rd way: \n"); Stream.iterate(start, i - > i + 1).filter(CheckOddOrEvenNumberWithinRangeJava8::isOdd).limit(8).forEach(System.out::println); } public static void retrieveEvenNumbersWithinRange(int start, int end) { System.out.println("\n\n EVEN NUMBERS WITHIN THE RANGE OF 10 AND 25"); //1st way System.out.println("\n 1st way: \n"); IntStream.range(start, end + 1).filter(i - > i % 2 == 0).forEach(System.out::println); //2nd way (traditional way - before java 8) System.out.println("\n 2nd way: \n"); for (int i = start; i <= end; i++) { if (i % 2 == 0) { System.out.println(i); } } //3rd way System.out.println("\n 3rd way: \n"); Stream.iterate(start, i - > i + 1).filter(CheckOddOrEvenNumberWithinRangeJava8::isEven).limit(8).forEach(System.out::println); } public static boolean isOdd(int number) { return number % 2 != 0; } public static boolean isEven(int number) { return number % 2 == 0; } } |
Output:
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 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | ODD NUMBERS WITHIN THE RANGE OF 10 AND 25 1st way: 11 13 15 17 19 21 23 25 2nd way: 11 13 15 17 19 21 23 25 3rd way: 11 13 15 17 19 21 23 25 EVEN NUMBERS WITHIN THE RANGE OF 10 AND 25 1st way: 10 12 14 16 18 20 22 24 2nd way: 10 12 14 16 18 20 22 24 3rd way: 10 12 14 16 18 20 22 24 |
Easiest representation of Java 8 Streams power to test Odd or Even numbers within a certain range...!!! Share on X
That’s it, Java 8 Streams API is so powerful and notice how shortened and understandable the code is.
Do you like this Post? – then check my other helpful posts:
- Double the even / odd numbers of a specified ArrayList using Streams
- Double the numbers of specified ArrayList using Streams
