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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A. MM d
B. MMM dd
C. MM dd
D. MMMM dd

Question 2

Which of the following statements are correct?

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

Question 3

Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A. It's always 2
B. It's either 0 or 1
C. Compilation fails
D. It's always 1
E. It's either 1 or 2

Question 4

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 is not thread-safe and does not prevent interference amongconcurrent threads.
D. The CopyOnWriteArrayList class does not allow null elements.
E. Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.

Question 5

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

Solutions: