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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) P1Y
PT8784H
B) UnsupportedTemporalTypeException
C) P1Y
UnsupportedTemporalTypeException
D) PT8784H
P1Y

2. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) An exception is thrown
B) 012
C) Nothing
D) 01
E) Compilation fails

3. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) It's a double with value: 42
C) Compilation fails.
D) It's an integer with value: 42
E) It throws an exception at runtime.
F) null

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

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

5. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) nothing
B) static
C) Compilation fails
D) default

Solutions: