Oracle Java SE 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #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)

Question #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

Question #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

Question #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

Question #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: