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

2. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.ofNullable("a");
B) Stream stream = Stream.empty();
C) Stream<String> stream = Stream.builder().add("a").build();
D) Stream stream = Stream.generate(() -> "a");
E) Stream stream = new Stream();
F) Stream stream = Stream.of();

3. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim bam boom
B) bim bam followed by an exception
C) Compilation fails.
D) bim boom
E) bim boom bam

4. 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

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

Solutions: