import java.util.OptionalLong; public class OptionalLongExample { public static void main(String[] args) { // 创建一个OptionalLong对象,包含一个值 OptionalLong optional = OptionalLong.of(5); // 使用ifPresentOrElse方法,如果值存在,则打印该值;否则,打印"Value is not present" optional.ifPresentOr...
public class IfPresentOrElseExample { public static void main(String[] args) { Optional<String> optionalValue = Optional.ofNullable("Hello, World!"); // 使用 ifPresentOrElse 方法打印 value optionalValue.ifPresent(value -> System.out.println("Value: " + value)); // 使用 ifPresentOrElse 方法...
Example 2Source File: AlertController.java From cloudbreak with Apache License 2.0 6 votes private void validateLoadAlert(Long clusterId, Optional<Long> alertId, LoadAlertRequest json) { Cluster cluster = getClusterForWorkspace(clusterId); alertId.ifPresentOrElse(updateAlert -> validateAlertFor...
import java.util.Optional; public class OptionalExample { public static void main(String[] args) { String value = "Hello, Optional!"; Optional<String> optionalValue = Optional.ofNullable(value); optionalValue.ifPresent(val -> System.out.println("Value is present: " + val)); } }JAVA 3. ...
Example import java.util.Optional; import java.util.concurrent.atomic.AtomicInteger; public class IfPresentOrElseMethodTest { public static void main(String args[]) { optionalIsPresent(); optionalIsEmpty(); } private static void optionalIsPresent() { Optional<String> optional = Optional.of("Tes...
Repo: publicinterfaceCourseRepositoryextendsCrudRepository<Course,Integer>{Optional<Course>findByName(String name); @Query("Select new com.example.university.view.CourseView" + "(c.name, c.instructor.member.lastName, c.department.name) from Course c where c.name=?1")Optional<CourseView>getCourse...
public class OptionalLongExample { public static void main(String[] args) { // 创建一个OptionalLong对象,包含一个值 OptionalLong optional = OptionalLong.of(5); // 使用ifPresentOrElse方法,如果值存在,则打印该值;否则,打印"Value is not present" ...
@Query("Select new com.example.university.view.CourseView" + "(c.name, c.instructor.member.lastName, c.department.name) from Course c where c.name=?1")Optional<CourseView>getCourseViewByName(String name); } 1. 2. 3. 4. 5.