Free Practice Oracle 1Z0-830 Exam Questions 2025

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Total 84 Questions | Updated On: Jul 08, 2024

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Question 1

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

A : var a = 1;(Valid: var correctly infers int)

B : var b = 2, c = 3.0;

C : var d[] = new int[4];

D : var e;

E : var f = { 6 };

F : var h = (g = 7);

Answer: B,C,D,E

Question 2

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?

A : 42000E

B : 42 000,00 €

C : 42000

D : 42 k

Answer: D

Question 3

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?

A : Neither files f1.txt nor f2.txt exist

B : Both files f1.txt and f2.txt exist

C : An exception is always thrown

D : File f2.txt exists while file f1.txt doesn't

E : File f1.txt exists while file f2.txt doesn't

Answer: C

Question 4

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

A : var a = 1;(Valid: var correctly infers int)

B : var b = 2, c = 3.0;

C : var d[] = new int[4];

D : var e;