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Oracle 1z0-830: Java SE 21 Developer Professional

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Question 1

Which of the following can be the body of a lambda expression?

Correct Answer:C

Question 2

Given: java
var frenchCities = new TreeSet(); frenchCities.add("Paris"); frenchCities.add("Marseille"); frenchCities.add("Lyon"); frenchCities.add("Lille"); frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille")); What will be printed?

Correct Answer:C

Question 3

Which of the following statements are correct?

Correct Answer:E

Question 4

Given: java
package com.vv;
import java.time.LocalDate; public class FetchService {
public static void main(String[] args) throws Exception { FetchService service = new FetchService();
String ack = service.fetch(); LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() { return "ok";
}
public LocalDate fetch() { return LocalDate.now();
}
}
What will be the output?

Correct Answer:B

Question 5

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));
}
}

Correct Answer:A

Question 6

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?

Correct Answer:D

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