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

2. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) File f1.txt exists while file f2.txt doesn't
B) An exception is always thrown
C) Both files f1.txt and f2.txt exist
D) Neither files f1.txt nor f2.txt exist
E) File f2.txt exists while file f1.txt doesn't

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

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

4. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) An exception is thrown.
B) US=UK
C) Compilation fails.
D) -US=UK
E) =US-UK
F) US-UK

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

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

Solutions: