TRUSTABLE 1Z0-830 TEST PRACTICE & NEWEST ORACLE CERTIFICATION TRAINING - PASS-SURE ORACLE JAVA SE 21 DEVELOPER PROFESSIONAL

Trustable 1z0-830 Test Practice & Newest Oracle Certification Training - Pass-Sure Oracle Java SE 21 Developer Professional

Trustable 1z0-830 Test Practice & Newest Oracle Certification Training - Pass-Sure Oracle Java SE 21 Developer Professional

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Oracle Java SE 21 Developer Professional Sample Questions (Q83-Q88):

NEW QUESTION # 83
Which two of the following aren't the correct ways to create a Stream?

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

Answer: B,F


NEW QUESTION # 84
Which of the following suggestions compile?(Choose two.)

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

Answer: C,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 # 85
Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

  • A. IOException
  • B. Compilation fails
  • C. ArithmeticException
  • D. RuntimeException

Answer: C

Explanation:
In this code, the try block throws an IOException. The catch block catches this exception and throws a new RuntimeException. Regardless of exceptions thrown in the try or catch blocks, the finally block is always executed. In this case, the finally block throws an ArithmeticException.
When an exception is thrown in a finally block, it overrides any previous exceptions that were thrown in the try or catch blocks. Therefore, the ArithmeticException thrown in the finally block is the exception that propagates out of the method. As a result, the program terminates with an ArithmeticException.


NEW QUESTION # 86
Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

  • A. Beaujolais Nouveau, Chablis, Saint-Emilion
  • B. Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
  • C. Saint-Emilion
  • D. Rose

Answer: A

Explanation:
* Analyzing the thrower() Method Execution
java
int i = 0;
return i / i;
* i / i evaluates to 0 / 0, whichthrows ArithmeticException (/ by zero).
* Since catch (NumberFormatException e) doesnot matchArithmeticException, it is skipped.
* The finally block always executes, printing:
nginx
Beaujolais Nouveau,
* The exceptionpropagates backto main().
* Handling the Exception in main()
java
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
* Since thrower() throws ArithmeticException, it is caught by catch (Exception e).
* "Chablis, "is printed.
* Thefinally block always executes, printing "Saint-Emilion".
* Final Output
nginx
Beaujolais Nouveau, Chablis, Saint-Emilion
Thus, the correct answer is:Beaujolais Nouveau, Chablis, Saint-Emilion
References:
* Java SE 21 - Exception Handling
* Java SE 21 - finally Block Execution


NEW QUESTION # 87
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: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
  • C. postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
  • D. postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5

Answer: B

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 # 88
......

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