Oracle 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) RuntimeException
B) IOException
C) Compilation fails
D) ArithmeticException

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

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

3. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) home
B) IllegalArgumentException
C) Compilation error
D) C:
E) C

4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) Nothing
B) 012
C) An exception is thrown
D) 01
E) Compilation fails

5. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) An IndexOutOfBoundsException is thrown
B) [c, b]
C) [a, b]
D) [d]
E) An UnsupportedOperationException is thrown
F) [d, b]

Solutions: