Oracle Java SE 21 Developer Professional : 1z1-830

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

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) 42000
B) 42000E
C) 42 k
D) 42 000,00 €

3. 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) An UnsupportedOperationException is thrown
D) [a, b]
E) [d, b]
F) [d]

4. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom
B) bim bam boom
C) Compilation fails.
D) bim bam followed by an exception
E) bim boom bam

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

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

Solutions: