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Free Oracle 1Z0-830 Exam Practice Questions

The new Oracle 1Z0-830 exam questions cover real topics from the latest Java SE 21 Developer Professional release. Each question helps you review dificult key areas and understand how the Oracle Java system works in real scenarios. Practice regularly with updated version of 1Z0 830 dumps, focus on weak points, prepare for your desired test effectively and pass your Oracle certification exam confidently on your first try.

Exam Code: 1Z0-830
Exam Questions: 84
Java SE 21 Developer Professional
Updated: 26 Nov, 2025
Viewing Page : 1 - 9
Practicing : 1 - 5 of 84 Questions
Question 1

Given: java ExecutorService service = Executors.newFixedThreadPool(2); Runnable task = () -> System.out.println("Task is complete"); service.submit(task); service.shutdown(); service.submit(task); What happens when executing the given code fragment? 

Options :
Answer: A
Question 2

Which three of the following are correct about the Java module system? 

Options :
Answer: B,C,F
Question 3

Which of the following statements oflocal variables declared with varareinvalid?(Choose 4) 

Options :
Answer: B,C,D,E
Question 4

Which methods compile? 

Options :
Answer: A,B
Question 5

Given: java 

String bread = optionalName.orElse("Baguette"); System.out.print("bread:" + bread); String dish = optionalName.orElseGet(() -> "Frog legs"); System.out.print(", dish:" + dish); try { String cheese = optionalName.orElseThrow(() -> new Exception()); System.out.println(", cheese:" + cheese); } catch (Exception exc) { System.out.println(", no cheese."); } What is printed?

Options :
Answer: B
Viewing Page : 1 - 9
Practicing : 1 - 5 of 84 Questions
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