Oracle 1z0-830 test insides dumps : Java SE 21 Developer Professional

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 0
B) An exception is thrown
C) Optional[1]
D) Compilation fails
E) 1
F) Optional.empty
G) 2

2. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \s
green\s
blue \s
""";
B) java
String colors = """
red \
green\
blue \
""";
C) java
String colors = """
red \t
green\t
blue \t
""";
D) None of the propositions
E) java
String colors = """
red
green
blue
""";

3. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) Iphone15 class does not compile
B) SmartPhone interface does not compile
C) An exception is thrown at running Iphone15.ring();
D) Everything compiles

4. 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
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
D) 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;
}

5. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) null
C) It's a double with value: 42
D) Compilation fails.
E) It throws an exception at runtime.
F) It's an integer with value: 42

Solutions: