solução-produto-do-array

produto-do-array/MultiplyArray.java

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+import java.util.ArrayList;
+import java.util.List;
+
+public class MultiplyArray {
+
+    public List<Long> multiply(List<Integer> numbers) {
+
+        if (numbers.isEmpty()) throw new IllegalArgumentException();
+        List<Long> result = new ArrayList<>();
+
+        Long prefix = 1L;
+        for (int i = 0; i < numbers.size(); i++) {
+            result.add(prefix);
+            prefix *= numbers.get(i);
+        }
+
+        Long suffix = 1L;
+        for (int i = numbers.size() - 1; i >= 0; i--) {
+            result.set(i, result.get(i) * suffix);
+            suffix *= numbers.get(i);
+        }
+
+        return result;
+    }
+}

produto-do-array/MultiplyArrayTest.java

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+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class MultiplyArrayTest {
+
+    private MultiplyArray multiplyArray;
+
+    @BeforeEach
+    public void setUp() {
+        multiplyArray = new MultiplyArray();
+    }
+
+    @Test
+    public void shouldReturnNewArrayOfMultiplyAllElementsInArray() {
+        List<Long> expected = new ArrayList<>(List.of(120L, 60L, 40L, 30L, 24L));
+        List<Integer> request = new ArrayList<>(List.of(1, 2, 3, 4, 5));
+
+        List<Long> result = multiplyArray.multiply(request);
+
+        assertNotNull(result);
+        assertEquals(expected, result);
+    }
+
+    @Test
+    public void shouldReturnEmptyNewArrayWhenArrayEmpty() {
+        List<Integer> requestArray = new ArrayList<>();
+        assertThrows(IllegalArgumentException.class, () -> multiplyArray.multiply(requestArray));
+    }
+
+    @Test
+    public void shouldReturnNewArrayWhenContainOneZero() {
+        List<Long> expected = new ArrayList<>(List.of(0L, 8L, 0L));
+        List<Integer> request = new ArrayList<>(List.of(2, 0, 4));
+
+        List<Long> result = multiplyArray.multiply(request);
+
+        assertNotNull(result);
+        assertEquals(expected, result);
+    }
+
+    @Test
+    public void shouldReturnAllZerosNewArrayWhenContainTwoOrMoreZero() {
+        List<Long> expected = new ArrayList<>(List.of(0L, 0L, 0L, 0L));
+        List<Integer> request = new ArrayList<>(List.of(2, 0, 4, 0));
+
+        List<Long> result = multiplyArray.multiply(request);
+
+        assertNotNull(result);
+        assertEquals(expected, result);
+    }
+}

produto-do-array/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+                             https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.gabriel</groupId>
+    <artifactId>produto-do-array</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <!-- JUnit 5 (Jupiter) -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.10.2</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <!-- Definindo seus diretórios personalizados -->
+        <sourceDirectory>${project.basedir}</sourceDirectory>
+        <testSourceDirectory>${project.basedir}</testSourceDirectory>
+
+        <plugins>
+            <!-- Plugin para rodar os testes -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.2.5</version>
+                <configuration>
+                    <useModulePath>false</useModulePath>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>