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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) Compilation fails.
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) Nothing

2. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) Numbers from 1 to 25 sequentially
B) Compilation fails
C) An exception is thrown at runtime
D) Numbers from 1 to 1945 randomly
E) Numbers from 1 to 25 randomly

3. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) None of the above
B) E
C) B
D) D
E) C
F) A

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

A) 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.
B) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
C) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
D) Code in an explicitly named module can access types in the unnamed module.
E) The unnamed module can only access packages defined in the unnamed module.
F) The unnamed module exports all of its packages.

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

Solutions: