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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) An exception is thrown at runtime
B) true
C) 3.3
D) Compilation fails
E) false

2. You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?

A) File name: module-info.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
B) File name: module.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
C) File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
}

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

4. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) An UnsupportedOperationException is thrown
B) [c, b]
C) [d, b]
D) [a, b]
E) [d]
F) An IndexOutOfBoundsException is thrown

5. Which of the following doesnotexist?

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

Solutions: