SURE ORACLE 1Z0-830 PASS | LATEST 1Z0-830 EXAM EXPERIENCE

Sure Oracle 1z0-830 Pass | Latest 1z0-830 Exam Experience

Sure Oracle 1z0-830 Pass | Latest 1z0-830 Exam Experience

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Oracle Java SE 21 Developer Professional Sample Questions (Q72-Q77):

NEW QUESTION # 72
Which of the followingisn'ta correct way to write a string to a file?

  • A. java
    try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
    }
  • B. None of the suggestions
  • C. java
    try (BufferedWriter writer = new BufferedWriter("file.txt")) {
    writer.write("Hello");
    }
  • D. java
    try (FileWriter writer = new FileWriter("file.txt")) {
    writer.write("Hello");
    }
  • E. java
    try (PrintWriter printWriter = new PrintWriter("file.txt")) {
    printWriter.printf("Hello %s", "James");
    }
  • F. java
    Path path = Paths.get("file.txt");
    byte[] strBytes = "Hello".getBytes();
    Files.write(path, strBytes);

Answer: C

Explanation:
(BufferedWriter writer = new BufferedWriter("file.txt") is incorrect.)
Theincorrect statementisoption Bbecause BufferedWriterdoes nothave a constructor that accepts a String (file name) directly. The correct way to use BufferedWriter is to wrap it around a FileWriter, like this:
java
try (BufferedWriter writer = new BufferedWriter(new FileWriter("file.txt"))) { writer.write("Hello");
}
Evaluation of Other Options:
Option A (Files.write)# Correct
* Uses Files.write() to write bytes to a file.
* Efficient and concise method for writing small text files.
Option C (FileOutputStream)# Correct
* Uses a FileOutputStream to write raw bytes to a file.
* Works for both text and binary data.
Option D (PrintWriter)# Correct
* Uses PrintWriter for formatted text output.
Option F (FileWriter)# Correct
* Uses FileWriter to write text data.
Option E (None of the suggestions)# Incorrect becauseoption Bis incorrect.


NEW QUESTION # 73
Which of the following suggestions compile?(Choose two.)

  • A. java
    sealed class Figure permits Rectangle {}
    final class Rectangle extends Figure {
    float length, width;
    }
  • B. java
    public sealed class Figure
    permits Circle, Rectangle {}
    final sealed class Circle extends Figure {
    float radius;
    }
    non-sealed class Rectangle extends Figure {
    float length, width;
    }
  • C. java
    sealed class Figure permits Rectangle {}
    public class Rectangle extends Figure {
    float length, width;
    }
  • D. java
    public sealed class Figure
    permits Circle, Rectangle {}
    final class Circle extends Figure {
    float radius;
    }
    non-sealed class Rectangle extends Figure {
    float length, width;
    }

Answer: A,D

Explanation:
Option A (sealed class Figure permits Rectangle {} and final class Rectangle extends Figure {}) - Valid
* Why it compiles?
* Figure issealed, meaning itmust explicitly declareits subclasses.
* Rectangle ispermittedto extend Figure and isdeclared final, meaning itcannot be extended further.
* This followsvalid sealed class rules.
Option B (sealed class Figure permits Rectangle {} and public class Rectangle extends Figure {}) -# Invalid
* Why it fails?
* Rectangle extends Figure, but it doesnot specify if it is sealed, final, or non-sealed.
* Fix:The correct declaration must be one of the following:
java
final class Rectangle extends Figure {} // OR
sealed class Rectangle permits OtherClass {} // OR
non-sealed class Rectangle extends Figure {}
Option C (final sealed class Circle extends Figure {}) -#Invalid
* Why it fails?
* A class cannot be both final and sealedat the same time.
* sealed meansit must have permitted subclasses, but final meansit cannot be extended.
* Fix:Change final sealed to just final:
java
final class Circle extends Figure {}
Option D (public sealed class Figure permits Circle, Rectangle {} with final class Circle and non-sealed class Rectangle) - Valid
* Why it compiles?
* Figure issealed, meaning it mustdeclare its permitted subclasses(Circle and Rectangle).
* Circle is declaredfinal, so itcannot have subclasses.
* Rectangle is declarednon-sealed, meaningit can be subclassedfreely.
* This correctly followsJava's sealed class rules.
Thus, the correct answers are:A, D
References:
* Java SE 21 - Sealed Classes
* Java SE 21 - Class Modifiers


NEW QUESTION # 74
Given:
java
String colors = "redn" +
"greenn" +
"bluen";
Which text block can replace the above code?

  • A. java
    String colors = """
    red s
    greens
    blue s
    """;
  • B. java
    String colors = """
    red t
    greent
    blue t
    """;
  • C. java
    String colors = """
    red
    green
    blue
    """;
  • D. java
    String colors = """
    red
    green
    blue
    """;
  • E. None of the propositions

Answer: D

Explanation:
* Understanding Multi-line Strings in Java (""" Text Blocks)
* Java 13 introducedtext blocks ("""), allowing multi-line stringswithout needing explicit n for new lines.
* In a text block,each line is preserved as it appears in the source code.
* Analyzing the Options
* Option A: (Backslash Continuation)
* The backslash () at the end of a lineprevents a new line from being added, meaning:
nginx
red green blue
* Incorrect.
* Option B: s (Whitespace Escape)
* s represents asingle space,not a new line.
* The output would be:
nginx
red green blue
* Incorrect.
* Option C: t (Tab Escape)
* t inserts atab, not a new line.
* The output would be:
nginx
red green blue
* Incorrect.
* Option D: Correct Text Block
java
String colors = """
red
green
blue
""";
* Thispreserves the new lines, producing:
nginx
red
green
blue
* Correct.
Thus, the correct answer is:"String colors = """ red green blue """."
References:
* Java SE 21 - Text Blocks
* Java SE 21 - String Formatting


NEW QUESTION # 75
Which of the following isn't a valid option of the jdeps command?

  • A. --check-deps
  • B. --list-reduced-deps
  • C. --generate-open-module
  • D. --list-deps
  • E. --print-module-deps
  • F. --generate-module-info

Answer: A

Explanation:
The jdeps tool is a Java class dependency analyzer that can be used to understand the static dependencies of applications and libraries. It provides several command-line options to customize its behavior.
Valid jdeps Options:
* --generate-open-module: Generates a module declaration (module-info.java) with open directives for the given JAR files or classes.
* --list-deps: Lists the immediate dependencies of the specified classes or JAR files.
* --generate-module-info: Generates a module declaration (module-info.java) for the given JAR files or classes.
* --print-module-deps: Prints the module dependencies of the specified modules or JAR files.
* --list-reduced-deps: Lists the reduced dependencies, showing only the packages that are directly depended upon.
Invalid Option:
* --check-deps: There is no --check-deps option in the jdeps tool.
Conclusion:
Option A (--check-deps) is not a valid option of the jdeps command.


NEW QUESTION # 76
Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

  • A. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
  • B. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
  • C. MyService service = ServiceLoader.load(MyService.class).iterator().next();
  • D. MyService service = ServiceLoader.getService(MyService.class);

Answer: A,C

Explanation:
The ServiceLoader class in Java is used to load service providers implementing a given service interface. The following methods are evaluated for their correctness in loading an implementation of MyService:
* A. MyService service = ServiceLoader.load(MyService.class).iterator().next(); This method uses the ServiceLoader.load(MyService.class) to create a ServiceLoader instance for MyService.
Calling iterator().next() retrieves the next available service provider. If no providers are available, a NoSuchElementException will be thrown. This approach is correct but requires handling the potential exception if no providers are found.
* B. MyService service = ServiceLoader.load(MyService.class).findFirst().get(); This method utilizes the findFirst() method introduced in Java 9, which returns an Optional describing the first available service provider. Calling get() on the Optional retrieves the service provider if present; otherwise, a NoSuchElementException is thrown. This approach is correct and provides a more concise way to obtain the first service provider.
* C. MyService service = ServiceLoader.getService(MyService.class);
The ServiceLoader class does not have a method named getService. Therefore, this method is incorrect and will result in a compilation error.
* D. MyService service = ServiceLoader.services(MyService.class).getFirstInstance(); The ServiceLoader class does not have a method named services or getFirstInstance. Therefore, this method is incorrect and will result in a compilation error.
In summary, options A and B are correct methods to load an implementation of MyService using ServiceLoader.


NEW QUESTION # 77
......

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