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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

3. Which of the following isn't a valid option of the jdeps command?

A) --print-module-deps
B) --generate-open-module
C) --list-reduced-deps
D) --generate-module-info
E) --list-deps
F) --check-deps

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

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

5. Which methods compile?

A) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
B) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
D) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp

Solutions: