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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) Compilation fails.
D) Sum: 22.0, Max: 8.5, Avg: 5.5

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

3. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ImplementingInterface
B) ExtendingClass
C) WithInstanceField
D) WithStaticField

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = new Stream();
B) Stream stream = Stream.of();
C) Stream stream = Stream.empty();
D) Stream<String> stream = Stream.builder().add("a").build();
E) Stream stream = Stream.generate(() -> "a");
F) Stream stream = Stream.ofNullable("a");

5. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) home
B) IllegalArgumentException
C) C
D) Compilation error
E) C:

Solutions: