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Rooted by: CardinalPractice
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  • Code 
    import static java.util.stream.IntStream.rangeClosed;
import java.util.List;

interface FizzBuzz {
  static List<String> evaluate(int input) {
    return rangeClosed(1, input).mapToObj(FizzBuzz::determineFizzbuzz).toList();
  }
  
  private static String determineFizzbuzz(int n) {
    if (n % 15 == 0) return "FizzBuzz";
    if (n % 3 == 0) return "Fizz";
    if (n % 5 == 0) return "Buzz";
    return "" + n;
  }
}
     Test Cases 
    import org.junit.jupiter.api.Test;
import java.util.List;

import static org.junit.jupiter.api.Assertions.assertEquals;

class SolutionTest {
  @Test
  void shouldAcceptInt() {
    assertEquals(List.of("1"), FizzBuzz.evaluate(1));
  }
  
  @Test
  void inputOfTwo() {
    assertEquals(List.of("1", "2"), FizzBuzz.evaluate(2));
  }
  
  @Test
  void inputOfThree() {
    assertEquals(List.of("1", "2", "Fizz"), FizzBuzz.evaluate(3));
  }
  
  @Test
  void inputOfFive() {
    assertEquals(List.of("1", "2", "Fizz", "4", "Buzz"), FizzBuzz.evaluate(5));
  }
  
  @Test
  void inputOfFifteen() {
    assertEquals(List.of("1", "2", "Fizz", "4", "Buzz", "Fizz", "7", "8", "Fizz", "Buzz", "11", "Fizz", "13", "14", "FizzBuzz"), FizzBuzz.evaluate(15));
  }
}
    View Run Output
  • Code
    • import static java.util.stream.IntStream.rangeClosed;
    • import java.util.List;
    • interface FizzBuzz {
    • static List<String> evaluate(int input) {
    • return rangeClosed(1, input).mapToObj(FizzBuzz::determineFizzbuzz).toList();
    • }
    • private static String determineFizzbuzz(int n) {
    • if(n % 15 == 0) return "FizzBuzz";
    • var ans = new StringBuilder();
    • if (n % 3 == 0) ans.append("Fizz");
    • else
    • if (n % 5 == 0) ans.append("Buzz");
    • return ans.length() > 0 ? ans.toString() : Integer.toString(n);
    • if (n % 15 == 0) return "FizzBuzz";
    • if (n % 3 == 0) return "Fizz";
    • if (n % 5 == 0) return "Buzz";
    • return "" + n;
    • }
    • }