Add A_CountEvenNumbers.java

Author: ZahidFKhan

src/test/java/com/github/streams/practice/a_easy/numbers/EasyNumbersProblemSolution.java

@@ -93,4 +93,8 @@ public static double meanOfNumbers(List<Integer> input) {
   public static Map<Integer, List<Integer>> groupingOfNumbers(List<Integer> randomIntegers) {
     return randomIntegers.stream().collect(Collectors.groupingBy(e -> e / 10));
   }
+
+  public static long countNumberOfEvenNumbers(final List<Integer> input) {
+    return input.stream().filter(x->x%2 ==0).count();
+  }
 }

src/test/java/com/github/streams/practice/a_easy/numbers/problems/A_CountEvenNumbers.java

@@ -0,0 +1,30 @@
+package com.github.streams.practice.a_easy.numbers.problems;
+
+import com.github.streams.practice.a_easy.numbers.EasyNumbersProblemSolution;
+import java.util.List;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Count even numbers:
+ *
+ * <p>Example: <br>
+ *
+ * Input = [1,2,3,4,5,6]<br>
+ * Output = 3 <br>
+ * Explanation: (1, 2, 3) are even numbers.
+ */
+class A_CountEvenNumbers {
+
+  @Test
+  @Disabled
+  void countEvenNumbers() {
+    final var input = List.of(1, 2, 3, 4, 5, 6, 7, 8);
+
+    final var mySolution = EasyNumbersProblemSolution.countNumberOfEvenNumbers(input);
+    final var yourSolution = -1L; // WRITE YOUR IMPLEMENTATION HERE//
+
+    Assertions.assertEquals(mySolution, yourSolution);
+  }
+}

src/test/java/com/github/streams/practice/a_easy/numbers/problems/G_DescendingNumberValue.java

@@ -17,7 +17,7 @@ class G_DescendingNumberValue {
   @Test
   @Disabled
   public void test() {
-    var input = DummyData.fakeList(7);
+    var input = DummyData.fakeListOfSize(7);
     var mySolution = EasyNumbersProblemSolution.getHighestPossibleValue(input);
     var yourSolution = "";
 

src/test/java/com/github/streams/practice/a_easy/numbers/problems/ignore/data/DummyData.java

@@ -39,7 +39,7 @@ public static List<Long> fakeListOfLongNumbers() {
         instance.number().randomNumber());
   }
 
-  public static List<Integer> fakeList(final int size) {
+  public static List<Integer> fakeListOfSize(final int size) {
     final var instance = new Faker();
     return IntStream.range(1, size)
         .mapToObj(x -> instance.number().numberBetween(1, 99))