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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It throws an exception at runtime.
B) It does not compile.
C) It compiles.

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

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

3. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) Compilation fails
B) {b=1, c=2, a=3}
C) {b=1, a=3, c=2}
D) {c=1, b=2, a=3}
E) {c=2, a=3, b=1}
F) {a=1, b=2, c=3}
G) {a=3, b=1, c=2}

4. Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A) format4
B) format2
C) format3
D) format1

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

Solutions: