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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) Nothing
B) markdown
Inner class:
------------
Outer field
C) An exception is thrown at runtime.
D) Compilation fails at line n2.
E) Compilation fails at line n1.

2. Which of the following isn't a valid option of the jdeps command?

A) --generate-open-module
B) --check-deps
C) --list-reduced-deps
D) --generate-module-info
E) --print-module-deps
F) --list-deps

3. 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 807
B) Peugeot
C) An exception is thrown at runtime.
D) Compilation fails.

4. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 666
B) Compilation fails
C) 42 42
D) 666 42

5. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 2 3
B) 1 1 2 2
C) 5 5 2 3
D) 1 5 5 1
E) 1 1 1 1

Solutions: