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

2. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0D
B) PT0H
C) Compilation fails
D) PT6H
E) It throws an exception

3. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) nothing
C) Compilation fails
D) default

4. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) UNITED-STATES
B) United-States
C) United-STATES
D) -UnitedSTATES
E) -UNITEDSTATES
F) -UnitedStates
G) UnitedStates

5. 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;
}

Solutions: