Online Access Free 1z1-830 Exam Questions

Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

• A.array1
• B.array5
• C.array2
• D.array4
• E.array3

Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?

• A.Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
• B.Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
• C.Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
• D.Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true

Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

• A.US-UK
• B.=US-UK
• C.US=UK
• D.An exception is thrown.
• E.-US=UK
• F.Compilation fails.

Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

• A.format4
• B.format3
• C.format2
• D.format1

Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

• A.It prints "Task is complete" twice and throws an exception.
• B.It prints "Task is complete" once, then exits normally.
• C.It prints "Task is complete" once and throws an exception.
• D.It prints "Task is complete" twice, then exits normally.
• E.It exits normally without printing anything to the console.