Oracle Java SE 21 Developer Professional : 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Which three of the following are correct about the Java module system?

A) Code in an explicitly named module can access types in the unnamed module.
B) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
C) The unnamed module exports all of its packages.
D) The unnamed module can only access packages defined in the unnamed module.
E) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
F) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.

3. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) abc
B) ABC
C) An exception is thrown.
D) Compilation fails.

4. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) False
B) True

5. Which of the following doesnotexist?

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

Solutions: