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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) Compilation fails.
B) 1
C) It throws an exception at runtime.
D) 0
E) 2

2. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) An exception is thrown.
B) 2 1 1
C) 1 2 1
D) 2 2 1
E) 1 2 2
F) 2 1 2
G) 1 1 2
H) 1 1 1
I) 2 2 2

3. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \t
green\t
blue \t
""";
B) None of the propositions
C) java
String colors = """
red \
green\
blue \
""";
D) java
String colors = """
red
green
blue
""";
E) java
String colors = """
red \s
green\s
blue \s
""";

4. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cbca
B) bca
C) cacb
D) abc
E) cba
F) acb
G) bac

5. Which of the following doesnotexist?

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

Solutions: