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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following doesnotexist?

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

2. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) An exception is thrown at running Iphone15.ring();
B) Iphone15 class does not compile
C) Everything compiles
D) SmartPhone interface does not compile

3. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) Compilation fails.
B) It throws an exception.
C) _$
D) 10

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

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

Solutions: