[BAEL-9181] Closing Scanner in Java

core-java-modules/core-java-scanner/pom.xml

@@ -30,5 +30,17 @@
             <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>5.8.2</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-engine</artifactId>
+			<version>5.8.2</version>
+			<scope>test</scope>
+		</dependency>
     </dependencies>
-</project>
+</project>

core-java-modules/core-java-scanner/src/main/java/com/baeldung/scanner/closescanner/ScannerClose.java

@@ -0,0 +1,21 @@
+package com.baeldung.scanner.closescanner;
+import java.util.Scanner;
+
+public class ScannerClose {
+    public String getGreetingMessage(Scanner scanner) {
+        System.out.print("Enter your name: ");
+        String name = scanner.nextLine();
+        return "Hi, " + name + " Welcome to Baeldung";
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        try {
+            ScannerClose example = new ScannerClose();
+            String message = example.getGreetingMessage(scanner);
+            System.out.println(message);
+        } finally {
+            scanner.close();
+        }
+    }
+}

core-java-modules/core-java-scanner/src/main/java/com/baeldung/scanner/closescanner/ScannerTryWithResources.java

@@ -0,0 +1,19 @@
+package com.baeldung.scanner.closescanner;
+import java.util.Scanner;
+
+public class ScannerTryWithResources {
+
+    public String getGreetingMessage(Scanner scanner) {
+        System.out.print("Enter your name: ");
+        String name = scanner.nextLine();
+        return "Hi, " + name + " Welcome to Baeldung";
+    }
+
+    public static void main(String[] args) {
+        try (Scanner scanner = new Scanner(System.in)) {
+            ScannerTryWithResources example = new ScannerTryWithResources();
+            String message = example.getGreetingMessage(scanner);
+            System.out.println(message);
+        }
+    }
+}

core-java-modules/core-java-scanner/src/test/java/com/baeldung/scannerclose/ScannerCloseUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.scannerclose;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+import java.io.ByteArrayInputStream;
+import java.util.Scanner;
+
+public class ScannerCloseUnitTest {
+    @Test
+    void givenUserName_whenGetGreetingMessage_thenReturnsWelcomeMessage() {
+        String input = "Anees\n";
+        ByteArrayInputStream inputStream = new ByteArrayInputStream(input.getBytes());
+        Scanner scanner = new Scanner(inputStream);
+
+        ScannerClose example = new ScannerClose();
+        String result = example.getGreetingMessage(scanner);
+
+        assertEquals("Hi, Anees Welcome to Baeldung", result);
+        scanner.close();
+    }
+}

core-java-modules/core-java-scanner/src/test/java/com/baeldung/scannerclose/ScannerTryWithResourcesUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.scannerclose;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+import java.io.ByteArrayInputStream;
+import java.util.Scanner;
+
+class ScannerTryWithResourcesUnitTest {
+
+    @Test
+    void givenUserName_whenGetGreetingMessage_thenReturnsWelcomeMessage() {
+        String simulatedInput = "Anees\n";
+        ByteArrayInputStream inputStream = new ByteArrayInputStream(simulatedInput.getBytes());
+
+        String result;
+        try (Scanner scanner = new Scanner(inputStream)) {
+            ScannerTryWithResources example = new ScannerTryWithResources();
+            result = example.getGreetingMessage(scanner);
+        }
+
+        assertEquals("Hi, Anees Welcome to Baeldung", result);
+    }
+}