FREE ORACLE 1Z0-830 EXAM QUESTIONS UPDATES FOR UP TO 365 DAYS

Free Oracle 1z0-830 Exam Questions updates for up to 365 days

Free Oracle 1z0-830 Exam Questions updates for up to 365 days

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Oracle Java SE 21 Developer Professional Sample Questions (Q13-Q18):

NEW QUESTION # 13
Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

  • A. ClassCastException
  • B. 0
  • C. NotSerializableException
  • D. Compilation fails
  • E. 1

Answer: A

Explanation:
In this program, we have two classes, A and B, both implementing the Serializable interface, and a Test class with the main method.
Program Flow:
* Serialization:
* An instance of class A is created and assigned to the variable a.
* An ObjectOutputStream is created to write to the file "o.ser".
* The object a is serialized and written to the file.
* The ObjectOutputStream is closed.
* Deserialization:
* An ObjectInputStream is created to read from the file "o.ser".
* The program attempts to read an object from the file and cast it to an instance of class B.
* The ObjectInputStream is closed.
Analysis:
* Serialization Process:
* The object a is an instance of class A and is serialized into the file "o.ser".
* Deserialization Process:
* When deserializing, the program reads the object from the file and attempts to cast it to class B.
* However, the object in the file is of type A, not B.
* Since A and B are distinct classes with no inheritance relationship, casting an A instance to B is invalid.
Exception Details:
* Attempting to cast an object of type A to type B results in a ClassCastException.
* The exception message would be similar to:
pgsql
Exception in thread "main" java.lang.ClassCastException: class A cannot be cast to class B Conclusion:
The program compiles successfully but throws a ClassCastException at runtime when it attempts to cast the deserialized object to class B.


NEW QUESTION # 14
Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

  • A. It compiles.
  • B. It does not compile.
  • C. It throws an exception at runtime.

Answer: B

Explanation:
In the provided code, the class ThisCalls has two constructors:
* No-Argument Constructor (ThisCalls()):
* This constructor calls the boolean constructor with this(true);.
* Boolean Constructor (ThisCalls(boolean flag)):
* This constructor attempts to call the no-argument constructor with this();.
This setup creates a circular call between the two constructors:
* The no-argument constructor calls the boolean constructor.
* The boolean constructor calls the no-argument constructor.
Such a circular constructor invocation leads to a compile-time error in Java, specifically "recursiveconstructor invocation." The Java Language Specification (JLS) states:
"It is a compile-time error for a constructor to directly or indirectly invoke itself through a series of one or more explicit constructor invocations involving this." Therefore, the code will not compile due to this recursive constructor invocation.


NEW QUESTION # 15
Which two of the following aren't the correct ways to create a Stream?

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

Answer: A,B

Explanation:
In Java, the Stream API provides several methods to create streams. However, not all approaches are valid.


NEW QUESTION # 16
Which two of the following aren't the correct ways to create a Stream?

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

Answer: A,B


NEW QUESTION # 17
A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

  • A. bash
    CopyEdit
    javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
  • B. css
    CopyEdit
    javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop
  • C. css
    CopyEdit
    javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
  • D. css
    CopyEdit
    javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

Answer: D

Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding Java Module Compilation (javac)
Java modules are compiled using the javac command with specific options to specify:
* Where the source files are located (--module-source-path)
* Where required dependencies (external modules) are located (-p / --module-path)
* Where the compiled output should be placed (-d)
Breaking Down the Correct Compilation Command
css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
* --module-source-path src # Specifies the directory where module sources are located.
* -p lib/com.eiffel.membership.jar # Specifies the module path (JAR dependency in lib).
* -d out # Specifies the output directory for compiled .class files.
* -m com.eiffeltower.shop # Specifies the module to compile (com.eiffeltower.shop).


NEW QUESTION # 18
......

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