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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. 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'});
}
}

A) stringBuilder3
B) stringBuilder4
C) stringBuilder1
D) stringBuilder2
E) None of them

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

A) var d[] = new int[4];
B) var a = 1;(Valid: var correctly infers int)
C) var b = 2, c = 3.0;
D) var f = { 6 };
E) var h = (g = 7);
F) var e;

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 only
B) Line 2 only
C) Line 3 only
D) The program successfully compiles
E) Line 2 and line 3
F) Line 1 and line 3
G) Line 1 and line 2

5. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) Numbers from 1 to 25 randomly
B) Numbers from 1 to 25 sequentially
C) Numbers from 1 to 1945 randomly
D) Compilation fails
E) An exception is thrown at runtime

Solutions: