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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 1
B) Compilation fails
C) Optional.empty
D) 2
E) Optional[1]
F) 0
G) An exception is thrown

3. Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

A) arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
B) Compilation fails.
C) An exception is thrown at runtime.
D) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
E) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00

4. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
B) Compilation fails.
C) An exception is thrown at runtime.
D) Nothing

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

Solutions: