From cb7f714d0c75608333eec80d5c4db5aff1eea896 Mon Sep 17 00:00:00 2001
From: "d.kapustin" <onewaykd@gmail.com>
Date: Thu, 28 Sep 2023 12:46:30 +0300
Subject: [PATCH] =?UTF-8?q?6.4.2.=20=D0=9E=D0=B1=D1=85=D0=BE=D0=B4=20?=
 =?UTF-8?q?=D0=BC=D0=B0=D1=81=D1=81=D0=B8=D0=B2=D0=B0=20=D1=81=20=D0=BF?=
 =?UTF-8?q?=D0=BE=D1=81=D0=BB=D0=B5=D0=B4=D0=BD=D0=B5=D0=B3=D0=BE=20=D1=8D?=
 =?UTF-8?q?=D0=BB=D0=B5=D0=BC=D0=B5=D0=BD=D1=82=D0=B0;=20https://job4j.ru/?=
 =?UTF-8?q?profile/exercise/2/task-view/101?=
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---
 .../ru/j4j/array/ReverseLoopForArray.java     | 12 ++++++
 src/main/java/ru/j4j/array/RollBackArray.java | 11 ++++++
 .../java/ru/j4j/array/RollBackArrayTest.java  | 39 +++++++++++++++++++
 3 files changed, 62 insertions(+)
 create mode 100644 src/main/java/ru/j4j/array/ReverseLoopForArray.java
 create mode 100644 src/main/java/ru/j4j/array/RollBackArray.java
 create mode 100644 src/test/java/ru/j4j/array/RollBackArrayTest.java

diff --git a/src/main/java/ru/j4j/array/ReverseLoopForArray.java b/src/main/java/ru/j4j/array/ReverseLoopForArray.java
new file mode 100644
index 0000000..db394be
--- /dev/null
+++ b/src/main/java/ru/j4j/array/ReverseLoopForArray.java
@@ -0,0 +1,12 @@
+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);
+        }
+    }
+}
diff --git a/src/main/java/ru/j4j/array/RollBackArray.java b/src/main/java/ru/j4j/array/RollBackArray.java
new file mode 100644
index 0000000..41e116c
--- /dev/null
+++ b/src/main/java/ru/j4j/array/RollBackArray.java
@@ -0,0 +1,11 @@
+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;
+    }
+}
diff --git a/src/test/java/ru/j4j/array/RollBackArrayTest.java b/src/test/java/ru/j4j/array/RollBackArrayTest.java
new file mode 100644
index 0000000..fed7210
--- /dev/null
+++ b/src/test/java/ru/j4j/array/RollBackArrayTest.java
@@ -0,0 +1,39 @@
+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);
+    }
+}
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