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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
B. MyService service = ServiceLoader.getService(MyService.class);
C. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
D. MyService service = ServiceLoader.load(MyService.class).iterator().next();

Question 2

Which of the following suggestions compile?(Choose two.)

A. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
B. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
C. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
D. java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}

Question 3

Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A. {c=1, b=2, a=3}
B. {b=1, a=3, c=2}
C. {c=2, a=3, b=1}
D. Compilation fails
E. {a=1, b=2, c=3}
F. {b=1, c=2, a=3}
G. {a=3, b=1, c=2}

Question 4

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

Question 5

Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A. It prints all elements, including changes made during iteration.
B. It prints all elements, but changes made during iteration may not be visible.
C. Compilation fails.
D. It throws an exception.

Solutions: