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

2. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 11
B) 10
C) 12
D) 14

3. Which of the following statements is correct about a final class?

A) It must contain at least a final method.
B) It cannot be extended by any other class.
C) It cannot implement any interface.
D) It cannot extend another class.
E) The final keyword in its declaration must go right before the class keyword.

4. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 1
B) It's either 1 or 2
C) Compilation fails
D) It's always 2
E) It's either 0 or 1

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

Solutions: