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Oracle Java SE 21 Developer Professional Sample Questions:

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

A) 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.
B) The unnamed module can only access packages defined in the unnamed module.
C) The unnamed module exports all of its packages.
D) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
E) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
F) Code in an explicitly named module can access types in the unnamed module.

2. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) It throws an exception.
B) It prints all elements, including changes made during iteration.
C) Compilation fails.
D) It prints all elements, but changes made during iteration may not be visible.

3. A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop
B) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
C) css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D) bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

4. 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) ExtendingClass
B) ImplementingInterface
C) WithInstanceField
D) WithStaticField

5. Which of the following can be the body of a lambda expression?

A) None of the above
B) Two statements
C) A statement block
D) An expression and a statement
E) Two expressions

Solutions: