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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new Test.B();
B) A a = new Test().new A();
C) A a = new A();
D) B b = new B();
E) A a = new Test.A();
F) B b = new Test().new B();

2. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) Compilation fails.
B) ABC
C) abc
D) An exception is thrown.

3. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 1 2 3 4
B) Compilation fails.
C) 1 2 3
D) An exception is thrown.
E) 0 1 2 3
F) 0 1 2

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

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

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

Solutions: