Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var e;
B) var b = 2, c = 3.0;
C) var h = (g = 7);
D) var a = 1;(Valid: var correctly infers int)
E) var d[] = new int[4];
F) var f = { 6 };

2. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) IOException
B) ArithmeticException
C) RuntimeException
D) Compilation fails

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

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

4. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It prints "Task is complete" twice, then exits normally.
B) It exits normally without printing anything to the console.
C) It prints "Task is complete" twice and throws an exception.
D) It prints "Task is complete" once, then exits normally.
E) It prints "Task is complete" once and throws an exception.

5. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42000E
B) 42000
C) 42 000,00 €
D) 42 k

Solutions: