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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) [Paris]
B) [Lille, Lyon]
C) [Lyon, Lille, Toulouse]
D) [Paris, Toulouse]
E) Compilation fails

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

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

3. Which three of the following are correct about the Java module system?

A) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
B) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
C) Code in an explicitly named module can access types in the unnamed module.
D) The unnamed module can only access packages defined in the unnamed module.
E) The unnamed module exports all of its packages.
F) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.

4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) Nothing
B) 012
C) 01
D) An exception is thrown
E) Compilation fails

5. 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) ArithmeticException
B) RuntimeException
C) IOException
D) Compilation fails

Solutions: