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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following doesnotexist?

A) Supplier<T>
B) LongSupplier
C) BiSupplier<T, U, R>
D) DoubleSupplier
E) BooleanSupplier
F) They all exist.

2. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:Baguette, dish:Frog legs, cheese.
B) bread:bread, dish:dish, cheese.
C) bread:Baguette, dish:Frog legs, no cheese.
D) Compilation fails.

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

4. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42);
B) None of the suggestions.
C) var concurrentHashMap = new ConcurrentHashMap();
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);

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

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

Solutions: