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

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

3. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) Sum: 22.0, Max: 8.5, Avg: 5.5
B) Sum: 22.0, Max: 8.5, Avg: 5.0
C) An exception is thrown at runtime.
D) Compilation fails.

4. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) markdown
Inner class:
------------
Outer field
B) Nothing
C) An exception is thrown at runtime.
D) Compilation fails at line n2.
E) Compilation fails at line n1.

5. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) Neither files f1.txt nor f2.txt exist
B) File f1.txt exists while file f2.txt doesn't
C) Both files f1.txt and f2.txt exist
D) File f2.txt exists while file f1.txt doesn't
E) An exception is always thrown

Solutions: