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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 10
B) 14
C) 12
D) 11

2. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) Compilation fails
B) null
C) Java
D) Optional[Java]

3. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {c=1, b=2, a=3}
B) {a=1, b=2, c=3}
C) {b=1, a=3, c=2}
D) Compilation fails
E) {b=1, c=2, a=3}
F) {a=3, b=1, c=2}
G) {c=2, a=3, b=1}

4. Which of the following methods of java.util.function.Predicate aredefault methods?

A) or(Predicate<? super T> other)
B) test(T t)
C) negate()
D) not(Predicate<? super T> target)
E) isEqual(Object targetRef)
F) and(Predicate<? super T> other)

5. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel
B) Chanel Dior Louis Vuitton
C) An ArrayIndexOutOfBoundsException is thrown at runtime.
D) Compilation fails.

Solutions: