Oracle Java SE 21 Developer Professional : 1z0-830 Exam Questions

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following isn't a valid option of the jdeps command?

A) --list-deps
B) --check-deps
C) --generate-module-info
D) --generate-open-module
E) --print-module-deps
F) --list-reduced-deps

2. Which of the following doesnotexist?

A) BooleanSupplier
B) They all exist.
C) Supplier<T>
D) LongSupplier
E) DoubleSupplier
F) BiSupplier<T, U, R>

3. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) True
B) False

4. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) IOException
B) ArithmeticException
C) Compilation fails
D) RuntimeException

5. Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A) format2
B) format1
C) format4
D) format3

Solutions: