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

2. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) None
C) You can use 'private' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'public' access modifier with all kinds of classes

3. Which of the following doesnotexist?

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

4. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ImplementingInterface
B) ExtendingClass
C) WithInstanceField
D) WithStaticField

5. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) Compilation fails.
B) It prints all elements, but changes made during iteration may not be visible.
C) It throws an exception.
D) It prints all elements, including changes made during iteration.

Solutions: