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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: 10 Feb, 2026
Viewing Page : 1 - 9
Practicing : 1 - 5 of 84 Questions
Question 1

Which methods compile? 

Options :
Answer: A,B
Question 2

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

Options :
Answer: B,C,D,E
Question 3

Given: java double amount = 42_000.00; NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style. SHORT); System.out.println(format.format(amount)); What is the output?

Options :
Answer: D
Question 4

Which StringBuilder variable fails to compile? java public class StringBuilderInstantiations { public static void main(String[] args) { var stringBuilder1 = new StringBuilder(); var stringBuilder2 = new StringBuilder(10); var stringBuilder3 = new StringBuilder("Java"); var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'}); } } 

Options :
Answer: B
Question 5

Given: java public class Test { public static void main(String[] args) throws IOException { Path p1 = Path.of("f1.txt"); Path p2 = Path.of("f2.txt"); Files.move(p1, p2); Files.delete(p1); } } In which case does the given program throw an exception?

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