6.4.2. Обход массива с последнего элемента;

https://job4j.ru/profile/exercise/2/task-view/101

src/main/java/ru/j4j/array/ReverseLoopForArray.java

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+package ru.j4j.array;
+
+public class ReverseLoopForArray {
+    public static void main(String[] args) {
+        int[] numbers = {1, 2, 3, 4, 5, 6, 7};
+        System.out.println("Элементы массива в обратном порядке: ");
+        for (int i = 0; i < numbers.length; i++) {
+            int el = numbers[numbers.length - i - 1];
+            System.out.println(el);
+        }
+    }
+}

src/main/java/ru/j4j/array/RollBackArray.java

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+package ru.j4j.array;
+
+public class RollBackArray {
+    public static int[] rollback(int[] array) {
+        int[] result = new int[array.length];
+        for (int index = 0; index < array.length; index++) {
+            result[index] = array[array.length - 1 - index];
+        }
+        return result;
+    }
+}

src/test/java/ru/j4j/array/RollBackArrayTest.java

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+package ru.j4j.array;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class RollBackArrayTest {
+    @Test
+    public void whenEmpty() {
+        int[] input = new int[] {};
+        int[] expected = new int[] {};
+        int[] result = RollBackArray.rollback(input);
+        assertThat(result).containsExactly(expected);
+    }
+
+    @Test
+    public void whenOne() {
+        int[] input = new int[] {1};
+        int[] expected = new int[] {1};
+        int[] result = RollBackArray.rollback(input);
+        assertThat(result).containsExactly(expected);
+    }
+
+    @Test
+    public void whenFull() {
+        int[] input = new int[] {1, 2, 3, 4};
+        int[] expected = new int[] {4, 3, 2, 1};
+        int[] result = RollBackArray.rollback(input);
+        assertThat(result).containsExactly(expected);
+    }
+
+    @Test
+    public void whenTheSame() {
+        int[] input = new int[] {1, 1, 1, 1};
+        int[] expected = new int[] {1, 1, 1, 1};
+        int[] result = RollBackArray.rollback(input);
+        assertThat(result).containsExactly(expected);
+    }
+}