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Oracle Java SE 21 Developer Professional Sample Questions:

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

A) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
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's iterator reflects all additions, removals, or changes to the list since the iterator was created.
E) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.

2. 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) An exception is always thrown
C) Both files f1.txt and f2.txt exist
D) File f1.txt exists while file f2.txt doesn't
E) File f2.txt exists while file f1.txt doesn't

3. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var f = { 6 };
B) var b = 2, c = 3.0;
C) var h = (g = 7);
D) var e;
E) var d[] = new int[4];
F) var a = 1;(Valid: var correctly infers int)

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

5. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) nothing
B) default
C) static
D) Compilation fails

Solutions: