Oracle 1z0-830 : Java SE 21 Developer Professional

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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
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
B) Rose
C) Beaujolais Nouveau, Chablis, Saint-Emilion
D) Saint-Emilion

3. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) An exception is always thrown
B) Both files f1.txt and f2.txt exist
C) File f1.txt exists while file f2.txt doesn't
D) File f2.txt exists while file f1.txt doesn't
E) Neither files f1.txt nor f2.txt exist

4. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) UnitedStates
C) United-STATES
D) -UnitedStates
E) -UNITEDSTATES
F) UNITED-STATES
G) United-States

5. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's either 1 or 2
B) Compilation fails
C) It's always 2
D) It's always 1
E) It's either 0 or 1

Solutions: