PASS-SURE 1Z1-830 RELIABLE TEST DURATION TO OBTAIN ORACLE CERTIFICATION

Pass-Sure 1z1-830 Reliable Test Duration to Obtain Oracle Certification

Pass-Sure 1z1-830 Reliable Test Duration to Obtain Oracle Certification

Blog Article

Tags: 1z1-830 Reliable Test Duration, Exam 1z1-830 Discount, Reliable 1z1-830 Test Questions, 1z1-830 Test Centres, Certification 1z1-830 Test Answers

Thousands of Java SE 21 Developer Professional exam aspirants have already passed their Oracle 1z1-830 certification exam and they all got help from top-notch and easy-to-use Oracle 1z1-830 Exam Questions. You can also use the Pass4Leader 1z1-830 exam questions and earn the badge of Oracle 1z1-830 certification easily.

Our 1z1-830 training guide has been well known in the market. Almost all candidates know our 1z1-830 exam questions as a powerful brand. Once their classmates or colleagues need to prepare an exam, they will soon introduce them to choose our 1z1-830 Study Materials. So our study materials are helpful to your preparation of the 1z1-830 exam. As a matter of fact, we receive thousands of the warm feedbacks to thank us for helping them pass the exam.

>> 1z1-830 Reliable Test Duration <<

Latest 1z1-830 Reliable Test Duration – Marvelous Exam Discount Provider for 1z1-830

In order to allow you to safely choose Pass4Leader, part of the best Oracle certification 1z1-830 exam materials provided online, you can try to free download to determine our reliability. We can not only help you pass the exam once for all, but also can help you save a lot of valuable time and effort. Pass4Leader can provide you with the real Oracle Certification 1z1-830 Exam practice questions and answers to ensure you 100% pass the exam. When having passed Oracle certification 1z1-830 exam your status in the IT area will be greatly improved and your prospect will be good.

Oracle Java SE 21 Developer Professional Sample Questions (Q42-Q47):

NEW QUESTION # 42
Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

  • A. ABC
  • B. abc
  • C. Compilation fails.
  • D. An exception is thrown.

Answer: B

Explanation:
In the provided code, a list abc is created containing the strings "a", "b", and "c". The first forEach operation attempts to convert each element to uppercase by assigning x = x.toUpperCase();. However, this assignment only changes the local variable x within the lambda expression and does not modify the elements in the original list abc. Strings in Java are immutable, meaning their values cannot be changed once created.
Therefore, the original list remains unchanged.
The second forEach operation iterates over the original list and prints each element. Since the list was not modified, the output will be the concatenation of the original elements: abc.
To achieve the output ABC, you would need to collect the transformed elements into a new list, as shown below:
java
List<String> abc = List.of("a", "b", "c");
List<String> upperCaseAbc = abc.stream()
map(String::toUpperCase)
collect(Collectors.toList());
upperCaseAbc.forEach(System.out::print);
In this corrected version, the map operation creates a new stream with the uppercase versions of the original elements, which are then collected into a new list upperCaseAbc. The forEach operation then prints ABC.


NEW QUESTION # 43
Which of the following statements are correct?

  • A. You can use 'private' access modifier with all kinds of classes
  • B. You can use 'protected' access modifier with all kinds of classes
  • C. None
  • D. You can use 'final' modifier with all kinds of classes
  • E. You can use 'public' access modifier with all kinds of classes

Answer: C

Explanation:
1. private Access Modifier
* The private access modifiercan only be used for inner classes(nested classes).
* Top-level classes cannot be private.
* Example ofinvaliduse:
java
private class MyClass {} // Compilation error
* Example ofvaliduse (for inner class):
java
class Outer {
private class Inner {}
}
2. protected Access Modifier
* Top-level classes cannot be protected.
* protectedonly applies to members (fields, methods, and constructors).
* Example ofinvaliduse:
java
protected class MyClass {} // Compilation error
* Example ofvaliduse (for methods/fields):
java
class Parent {
protected void display() {}
}
3. public Access Modifier
* Atop-level class can be public, butonly one public class per file is allowed.
* Example ofvaliduse:
java
public class MyClass {}
* Example ofinvaliduse:
java
public class A {}
public class B {} // Compilation error: Only one public class per file
4. final Modifier
* finalcan be used with classes, but not all kinds of classes.
* Interfaces cannot be final, because they are meant to be implemented.
* Example ofinvaliduse:
java
final interface MyInterface {} // Compilation error
Thus,none of the statements are fully correct, making the correct answer:None References:
* Java SE 21 - Access Modifiers
* Java SE 21 - Class Modifiers


NEW QUESTION # 44
Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

  • A. execService.call(task2);
  • B. execService.run(task1);
  • C. execService.execute(task1);
  • D. execService.execute(task2);
  • E. execService.submit(task2);
  • F. execService.submit(task1);
  • G. execService.call(task1);
  • H. execService.run(task2);

Answer: E,F

Explanation:
* Understanding ExecutorService Methods
* execute(Runnable command)
* Runs the task but only supports Runnable (not Callable).
* #execService.execute(task2); fails because task2 is Callable<String>.
* submit(Runnable task)
* Submits a Runnable task for execution.
* execService.submit(task1); executes "Executing Task-1".
* submit(Callable<T> task)
* Submits a Callable<T> task for execution.
* execService.submit(task2); executes "Executing Task-2".
* call() Does Not Exist in ExecutorService
* #execService.call(task1); and execService.call(task2); are invalid.
* run() Does Not Exist in ExecutorService
* #execService.run(task1); and execService.run(task2); are invalid.
* Correct Code to Print Both Messages:
java
execService.submit(task1);
execService.submit(task2);
Thus, the correct answer is:execService.submit(task1); execService.submit(task2); References:
* Java SE 21 - ExecutorService
* Java SE 21 - Callable and Runnable


NEW QUESTION # 45
Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

  • A. It's always 1
  • B. It's either 1 or 2
  • C. It's either 0 or 1
  • D. Compilation fails
  • E. It's always 2

Answer: D

Explanation:
In this code, the Test class has a static integer field count and a constructor that is declared with the synchronized modifier. In Java, the synchronized modifier can be applied to methods to control access to critical sections, but it cannot be applied directly to constructors. Attempting to declare a constructor as synchronized will result in a compilation error.
Compilation Error Details:
The Java Language Specification does not permit the use of the synchronized modifier on constructors.
Therefore, the compiler will produce an error indicating that the synchronized modifier is not allowed in this context.
Correct Usage:
If you need to synchronize the initialization of instances, you can use a synchronized block within the constructor:
java
public class Test {
static int count;
Test() {
synchronized (Test.class) {
count++;
}
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
In this corrected version, the synchronized block within the constructor ensures that the increment operation on count is thread-safe.
Conclusion:
The original program will fail to compile due to the illegal use of the synchronized modifier on the constructor. Therefore, the correct answer is E: Compilation fails.


NEW QUESTION # 46
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. PT6H
  • B. Compilation fails
  • C. It throws an exception
  • D. PT0D
  • E. PT0H

Answer: A

Explanation:
In this code, a Duration object day is created representing a duration of 2 days using the Duration.ofDays(2) method. The dividedBy(long divisor) method is then called on this Duration object with the argument 8.
The dividedBy(long divisor) method returns a copy of the original Duration divided by the specified value. In this case, dividing 2 days by 8 results in a duration of 0.25 days. In the ISO-8601 duration format used by Java's Duration class, this is represented as PT6H, which stands for a period of 6 hours.
Therefore, the output of the System.out.print statement is PT6H.


NEW QUESTION # 47
......

Our website Pass4Leader provide the 1z1-830 test guide to clients and help they pass the test 1z1-830 certification which is highly authorized and valuable. Our company is a famous company which bears the world-wide influences and our 1z1-830 test prep is recognized as the most representative and advanced study materials among the same kinds of products. Whether the qualities and functions or the service of our 1z1-830 Exam Questions, are leading and we boost the most professional expert team domestically.

Exam 1z1-830 Discount: https://www.pass4leader.com/Oracle/1z1-830-exam.html

Using our 1z1-830 dumps pdf is the only fast way to clear the actual test because our test answers are approved by our experts, Now, please choose our 1z1-830 valid study guide for your 100% passing, Our 1z1-830 practice tests and pdf dumps get updated on regular basis, You can easily use all these three Oracle 1z1-830 exam questions format, The training materials contains latest 1z1-830 dumps torrent and study guide which are come up with by our IT experts and certified trainers.

The Basics of Variables and Arrays, To avoid making mistakes with big data, business intuition is critical, Using our 1z1-830 Dumps PDF is the only fast way to clear the actual test because our test answers are approved by our experts.

Pass4Leader Oracle 1z1-830 Exam Questions are Real and Verified by Experts

Now, please choose our 1z1-830 valid study guide for your 100% passing, Our 1z1-830 practice tests and pdf dumps get updated on regular basis, You can easily use all these three Oracle 1z1-830 exam questions format.

The training materials contains latest 1z1-830 dumps torrent and study guide which are come up with by our IT experts and certified trainers.

Report this page