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Oracle Java SE 21 Developer Professional Sample Questions:

1. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
B) None of the suggestions.
C) var concurrentHashMap = new ConcurrentHashMap(42, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42);
E) var concurrentHashMap = new ConcurrentHashMap();

2. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [d, b]
B) [a, b]
C) An UnsupportedOperationException is thrown
D) [d]
E) [c, b]
F) An IndexOutOfBoundsException is thrown

3. 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.

4. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) markdown
Inner class:
------------
Outer field
B) Compilation fails at line n2.
C) Compilation fails at line n1.
D) An exception is thrown at runtime.
E) Nothing

5. Which of the following doesnotexist?

A) DoubleSupplier
B) LongSupplier
C) BiSupplier<T, U, R>
D) BooleanSupplier
E) Supplier<T>
F) They all exist.

Solutions: