Oracle 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #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

Question #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

Question #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

Question #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

Question #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: