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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A. 42000
B. 42 k
C. 42 000,00 €
D. 42000E

Question 2

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 3

Which of the following statements are correct?

A. You can use 'private' access modifier with all kinds of classes
B. None
C. You can use 'public' access modifier with all kinds of classes
D. You can use 'protected' access modifier with all kinds of classes
E. You can use 'final' modifier with all kinds of classes

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

Question 5

Which methods compile?

A. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
B. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp

Solutions: