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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following can be the body of a lambda expression?

A) None of the above
B) Two expressions
C) Two statements
D) A statement block
E) An expression and a statement

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

3. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) ABC
B) abc
C) Compilation fails.
D) An exception is thrown.

4. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It exits normally without printing anything to the console.
B) It prints "Task is complete" once, then exits normally.
C) It prints "Task is complete" twice and throws an exception.
D) It prints "Task is complete" once and throws an exception.
E) It prints "Task is complete" twice, then exits normally.

5. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) false
B) 3.3
C) Compilation fails
D) true
E) An exception is thrown at runtime

Solutions: