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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?

A) Peugeot
B) An exception is thrown at runtime.
C) Peugeot 807
D) Compilation fails.

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

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

3. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A) ok the 2024-07-10T07:17:45.523939600
B) ok the 2024-07-10
C) An exception is thrown
D) Compilation fails

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

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

5. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cacb
B) bac
C) abc
D) cba
E) cbca
F) bca
G) acb

Solutions: