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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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 k
D. 42 000,00 €

Question 2

Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A. fos.write("Today");
B. oos.writeObject("Today");
C. fos.writeObject("Today");
D. oos.write("Today");

Question 3

Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A. It throws an exception.
B. 10
C. Compilation fails.
D. _$

Question 4

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

A. 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;
}
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 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;
}

Question 5

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

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

Solutions: