VALID 1Z0-830 EXAM FORMAT, VALID 1Z0-830 TEST OBJECTIVES

Valid 1z0-830 Exam Format, Valid 1z0-830 Test Objectives

Valid 1z0-830 Exam Format, Valid 1z0-830 Test Objectives

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Oracle Java SE 21 Developer Professional Sample Questions (Q62-Q67):

NEW QUESTION # 62
Which of the following java.io.Console methods doesnotexist?

  • A. reader()
  • B. read()
  • C. readPassword(String fmt, Object... args)
  • D. readLine(String fmt, Object... args)
  • E. readPassword()
  • F. readLine()

Answer: B

Explanation:
* java.io.Console is used for interactive input from the console.
* Existing Methods in java.io.Console
* reader() # Returns a Reader object.
* readLine() # Reads a line of text from the console.
* readLine(String fmt, Object... args) # Reads a formatted line.
* readPassword() # Reads a password, returning a char[].
* readPassword(String fmt, Object... args) # Reads a formatted password.
* read() Does Not Exist
* Consoledoes not have a read() method.
* If character-by-character reading is required, use:
java
Console console = System.console();
Reader reader = console.reader();
int c = reader.read(); // Reads one character
* read() is available inReader, butnot in Console.
Thus, the correct answer is:read() does not exist.
References:
* Java SE 21 - Console API
* Java SE 21 - Reader API


NEW QUESTION # 63
What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\home\joe\foo");
System.out.println(path.getName(0));

  • A. C
  • B. IllegalArgumentException
  • C. Compilation error
  • D. home
  • E. C:

Answer: D

Explanation:
In Java's java.nio.file package, the Path class represents a file path in a file system. The Paths.get(String first, String... more) method is used to create a Path instance by converting a path string or URI.
In the provided code snippet, the Path object path is created with the string "C:\home\joe\foo". This represents an absolute path on a Windows system.
The getName(int index) method of the Path class returns a name element of the path as a Path object. The index is zero-based, where index 0 corresponds to the first element in the path's name sequence. It's important to note that the root component (e.g., "C:" on Windows) is not considered a name element and is not included in this sequence.
Therefore, for the path "C:\home\joe\foo":
* Root Component:"C:"
* Name Elements:
* Index 0: "home"
* Index 1: "joe"
* Index 2: "foo"
When path.getName(0) is called, it returns the first name element, which is "home". Thus, the output of the System.out.println statement is home.


NEW QUESTION # 64
Which two of the following aren't the correct ways to create a Stream?

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

Answer: B,C


NEW QUESTION # 65
Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

  • A. An exception is thrown at runtime.
  • B. Nothing
  • C. Compilation fails at line n2.
  • D. nginx
    Hall of Mirrors has 17 mirrors.
    The gardens cover 800 hectares.
  • E. Compilation fails at line n1.

Answer: E

Explanation:
* Understanding Constructors vs. Methods in Java
* In Java, aconstructormustnot have a return type.
* The followingis NOT a constructorbut aregular method:
java
void Versailles() { // This is NOT a constructor!
* Correct way to define a constructor:
java
public Versailles() { // Constructor must not have a return type
* Since there isno constructor explicitly defined,Java provides a default no-argument constructor, which does nothing.
* Why Does Compilation Fail?
* void Versailles() is interpreted as amethod,not a constructor.
* This means the default constructor (which does nothing) is called.
* Since the method Versailles() is never called, the object fields remain uninitialized.
* If the constructor were correctly defined, the output would be:
nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
* How to Fix It
java
public Versailles() { // Corrected constructor
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
Thus, the correct answer is:Compilation fails at line n1.
References:
* Java SE 21 - Constructors
* Java SE 21 - Methods vs. Constructors


NEW QUESTION # 66
Which of the following statements is correct about a final class?

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

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 # 67
......

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