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

2. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Compilation fails.
B) An ArrayIndexOutOfBoundsException is thrown at runtime.
C) Chanel Dior Louis Vuitton
D) Chanel

3. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) Compilation fails
B) ArithmeticException
C) RuntimeException
D) IOException

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) The program successfully compiles
B) Line 2 and line 3
C) Line 1 and line 2
D) Line 1 and line 3
E) Line 1 only
F) Line 3 only
G) Line 2 only

5. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom bam
B) bim bam boom
C) Compilation fails.
D) bim bam followed by an exception
E) bim boom

Solutions: