Oracle Java SE 21 Developer Professional : 1z0-830

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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
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

3. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ , hello ,hi ]
B) [ ,hello,h i]
C) [,hello,h i]
D) [,hello,hi]

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.ofNullable("a");
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.generate(() -> "a");
D) Stream stream = new Stream();
E) Stream stream = Stream.empty();
F) Stream stream = Stream.of("a");
G) Stream stream = Stream.of();

5. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
B) {}
C) Compilation fails.
D) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E) An exception is thrown at runtime.

Solutions: