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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Which of the following suggestions compile?(Choose two.)

A) java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
B) java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
C) java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
D) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}

3. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MM d
B) MM dd
C) MMM dd
D) MMMM dd

4. 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 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) 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.

5. Which of the followingisn'ta correct way to write a string to a file?

A) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
B) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
C) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
D) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
E) None of the suggestions
F) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}

Solutions: