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Oracle Java SE 21 Developer Professional Sample Questions (Q34-Q39):

NEW QUESTION # 34
Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

  • A. postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
  • B. postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
  • C. postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
  • D. postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

Answer: D

Explanation:
* Understanding post++ (Post-increment)
* post++uses the value first, then increments it.
* postResult = post++ + 10;
* post starts as 5.
* post++ returns 5, then post is incremented to 6.
* postResult = 5 + 10 = 15.
* Final value of post after this line is 6.
* Understanding ++pre (Pre-increment)
* ++preincrements the value first, then uses it.
* preResult = ++pre + 10;
* pre starts as 5.
* ++pre increments pre to 6, then returns 6.
* preResult = 6 + 10 = 16.
* Final value of pre after this line is 6.
Thus, the final output is:
yaml
postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6 References:
* Java SE 21 - Operators and Expressions
* Java SE 21 - Arithmetic Operators


NEW QUESTION # 35
Which of the following statements is correct about a final class?

  • A. The final keyword in its declaration must go right before the class keyword.
  • B. It cannot extend another class.
  • C. It cannot be extended by any other class.
  • D. It must contain at least a final method.
  • E. It cannot implement any interface.

Answer: C

Explanation:
In Java, the final keyword can be applied to classes, methods, and variables to impose certain restrictions.
Final Classes:
* Definition:A class declared with the final keyword is known as a final class.
* Purpose:Declaring a class as final prevents it from being subclassed. This is useful when you want to ensure that the class's implementation remains unchanged and cannot be extended or modified through inheritance.
Option Evaluations:
* A. The final keyword in its declaration must go right before the class keyword.
* This is correct. The syntax for declaring a final class is:
java
public final class ClassName {
// class body
}
* However, this statement is about syntax rather than the core characteristic of a final class.
* B. It must contain at least a final method.
* Incorrect. A final class can have zero or more methods, and none of them are required to be declared as final. The final keyword at the class level prevents inheritance, regardless of the methods' finality.
* C. It cannot be extended by any other class.
* Correct. The primary characteristic of a final class is that it cannot be subclassed. Attempting to do so will result in a compilation error.
* D. It cannot implement any interface.
* Incorrect. A final class can implement interfaces. Declaring a class as final restricts inheritance but does not prevent the class from implementing interfaces.
* E. It cannot extend another class.
* Incorrect. A final class can extend another class. The final keyword prevents the class from being subclassed but does not prevent it from being a subclass itself.
Therefore, the correct statement about a final class is option C: "It cannot be extended by any other class."


NEW QUESTION # 36
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

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

Answer: A,C,D,F

Explanation:
1. Valid Use Cases of var
* var is alocal variable type inferencefeature.
* The compilerinfers the type from the assigned value.
* Example of valid use:
java
var a = 10; // Type inferred as int
var str = "Hello"; // Type inferred as String
2. Analyzing the Given Statements
Statement
Valid/Invalid
Reason
var a = 1;
Valid
Type inferred as int.
var b = 2, c = 3.0;
#Invalid
var doesnot allow multiple declarationsin one statement.
var d[] = new int[4];
#Invalid
Array brackets []are not allowedwith var.
var e;
#Invalid
varrequires an initializer(cannot be declared without assignment).
var f = { 6 };
#Invalid
{ 6 } is anarray initializer, which must have an explicit type.
var h = (g = 7);
Valid
g is assigned 7, and h gets its value.
Thus, the correct answers are:B, C, D, E
References:
* Java SE 21 - Local Variable Type Inference (var)
* Java SE 21 - var Restrictions


NEW QUESTION # 37
You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?

  • A. File name: module-info.java
    java
    module perfumery.shop {
    requires perfumery.provider;
    exports perfumery.shop.eaudeparfum;
    }
  • B. File name: module.java
    java
    module shop.perfumery {
    requires perfumery.provider;
    exports perfumery.shop.eaudeparfum;
    }
  • C. File name: module-info.perfumery.shop.java
    java
    module perfumery.shop {
    requires perfumery.provider;
    exports perfumery.shop.eaudeparfum.*;
    }

Answer: A

Explanation:
* Correct module descriptor file name
* A module declaration must be placed inside a file namedmodule-info.java.
* The incorrect filename module-info.perfumery.shop.javais invalid(Option A).
* The incorrect filename module.javais invalid(Option C).
* Correct module declaration
* The module declaration must match the name of the module (perfumery.shop).
* The requires perfumery.provider; directive specifies that perfumery.shop depends on perfumery.
provider.
* The exports perfumery.shop.eaudeparfum; statement allows the perfumery.shop.eaudeparfum package to beaccessible by other modules.
* The incorrect syntax exports perfumery.shop.eaudeparfum.*; in Option A isinvalid, as wildcards (*) arenot allowedin module exports.
Thus, the correct answer is:File name: module-info.java
References:
* Java SE 21 - Modules
* Java SE 21 - module-info.java File


NEW QUESTION # 38
Which two of the following aren't the correct ways to create a Stream?

  • A. Stream stream = new Stream();
  • B. Stream stream = Stream.ofNullable("a");
  • C. Stream stream = Stream.of();
  • D. Stream<String> stream = Stream.builder().add("a").build();
  • E. Stream stream = Stream.empty();
  • F. Stream stream = Stream.generate(() -> "a");

Answer: A,D


NEW QUESTION # 39
......

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