这是indexloc提供的服务，不要输入任何密码
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[BAEL-9181] Closing Scanner in Java #18397

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[BAEL-9181] Closing Scanner in Java #18397

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38abed7
Create ScannerClose.java
Anees1214 Mar 13, 2025
9d5c7ed
Create ScannerTryWithResources.java
Anees1214 Mar 13, 2025
6099c23
Create ScannerCloseUnitTest.java
Anees1214 Mar 13, 2025
f1afd06
Create ScannerTryWithResourcesUnitTest.java
Anees1214 Mar 13, 2025
3df1b40
Update pom.xml
Anees1214 Mar 13, 2025
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14 changes: 13 additions & 1 deletion core-java-modules/core-java-scanner/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -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>
21 changes: 21 additions & 0 deletions core-java-modules/core-java-scanner/src/main/java/com/baeldung/scanner/ScannerClose.java
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@@ -0,0 +1,21 @@
package com.baeldung.scanner;
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();
}
}
}
19 changes: 19 additions & 0 deletions ...modules/core-java-scanner/src/main/java/com/baeldung/scanner/ScannerTryWithResources.java
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@@ -0,0 +1,19 @@
package com.baeldung.scanner;
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);
}
}
}
22 changes: 22 additions & 0 deletions ...va-modules/core-java-scanner/src/test/java/com/baeldung/scanner/ScannerCloseUnitTest.java
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package com.baeldung.scanner;

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();
}
}
23 changes: 23 additions & 0 deletions ...core-java-scanner/src/test/java/com/baeldung/scanner/ScannerTryWithResourcesUnitTest.java
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package com.baeldung.scanner;

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 input = "Anees\n";
ByteArrayInputStream inputStream = new ByteArrayInputStream(input.getBytes());

String result;
try (Scanner scanner = new Scanner(inputStream)) {
ScannerTryWithResources example = new ScannerTryWithResources();
result = example.getGreetingMessage(scanner);
}

assertEquals("Hi, Anees Welcome to Baeldung", result);
}
}