Optional<String> opt = Optional.ofNullable(null); System.out.println(opt.get()); Answer: Throws NoSuchElementException because ofNullable(null) returns Optional.empty() , and calling get() on empty throws. The trap is thinking ofNullable magically avoids the exception—it only avoids NullPointerException during creation. A typical new question:
| Topic Area | Weight in Old Test | Weight in Updated Test | |------------|-------------------|------------------------| | Lambdas & Functional Interfaces | 15% | 22% | | Stream API (incl. collectors & parallel) | 12% | 18% | | java.time API | 5% | 12% | | Optional class | 8% | 9% | | Default & static methods in interfaces | 8% | 10% | | Concurrency (CompletableFuture basics) | 6% | 8% | | Collections & Generics | 18% | 10% | | Exception handling & try-with-resources | 6% | 5% | | Miscellaneous (NIO, reflection, annotations) | 22% | 6% | ikm java 8 test updated
LocalDate date = LocalDate.of(2024, Month.FEBRUARY, 29); date = date.plusYears(1); System.out.println(date); A) 2025-02-28 B) 2025-03-01 C) 2025-02-29 (compilation error) D) RuntimeException Optional<String> opt = Optional
If you are a Java developer, software engineer, or IT consultant, you have likely encountered the IKM (International Knowledge Measurement) assessment. Specifically, the IKM Java 8 test has long been a benchmark for employers to gauge your proficiency in one of the most enduring versions of Java—Java 8. collectors & parallel) | 12% | 18% | | java