Oracle 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #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. Nothing
B. Compilation fails.
C. An exception is thrown at runtime.
D. vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose

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

Question #3
Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A. The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
B. The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
C. The CopyOnWriteArrayList class does not allow null elements.
D. The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
E. Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.

Question #4
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A. format4
B. format1
C. format2
D. format3

Question #5
Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

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

Solutions: