Oracle 1z1-830 Actual Tests : Java SE 21 Developer Professional

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It does not compile.
B) It compiles.
C) It throws an exception at runtime.

2. 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) Compilation fails.
D) Peugeot 807

3. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Compilation fails.
C) Chanel Dior Louis Vuitton
D) Chanel

4. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) Compilation fails
B) {c=2, a=3, b=1}
C) {c=1, b=2, a=3}
D) {a=3, b=1, c=2}
E) {b=1, a=3, c=2}
F) {b=1, c=2, a=3}
G) {a=1, b=2, c=3}

5. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) Compilation fails
B) PT0H
C) PT0D
D) It throws an exception
E) PT6H

Solutions: