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Questions and Answers
When an exception is thrown in Java, what primary action occurs?
When an exception is thrown in Java, what primary action occurs?
- The program immediately halts execution.
- An exception object is instantiated, encapsulating error details. (correct)
- The JVM disregards the exception, allowing the program to proceed.
- The exception is automatically resolved by the JVM without intervention.
Which of the following exceptions is classified as a checked exception in Java?
Which of the following exceptions is classified as a checked exception in Java?
- FileNotFoundException (correct)
- ArithmeticException
- NullPointerException
- ArrayIndexOutOfBoundsException
Which Java keyword is specifically used to manually trigger an exception within a program?
Which Java keyword is specifically used to manually trigger an exception within a program?
- catch
- throw (correct)
- throws
- finally
Which of the following exceptions, if unhandled, would not result in a compile-time error?
Which of the following exceptions, if unhandled, would not result in a compile-time error?
What is the primary function of a finally block in Java exception handling?
What is the primary function of a finally block in Java exception handling?
In Java, what occurs if an exception is thrown but no suitable catch block is found to handle it?
In Java, what occurs if an exception is thrown but no suitable catch block is found to handle it?
Which class serves as the root of the exception hierarchy in Java, acting as the ancestor for all exceptions and errors?
Which class serves as the root of the exception hierarchy in Java, acting as the ancestor for all exceptions and errors?
Which category of exceptions is most often associated with flaws in program logic or design?
Which category of exceptions is most often associated with flaws in program logic or design?
What defines a custom exception in Java?
What defines a custom exception in Java?
Consider the method signature: public void readFile() throws IOException. What does this declaration imply for code that calls readFile()?
Consider the method signature: public void readFile() throws IOException. What does this declaration imply for code that calls readFile()?
Unchecked exceptions must be declared in the method signature.
Unchecked exceptions must be declared in the method signature.
Errors typically represent conditions that the application can recover from.
Errors typically represent conditions that the application can recover from.
The finally block is always executed, even if an exception occurs.
The finally block is always executed, even if an exception occurs.
A custom exception must extend either the Throwable or Error class.
A custom exception must extend either the Throwable or Error class.
FileNotFoundException is a subclass of IOException.
FileNotFoundException is a subclass of IOException.
Which of the following are checked exceptions? (Select all that apply)
Which of the following are checked exceptions? (Select all that apply)
Which statements about exception handling are true? (Select all that apply)
Which statements about exception handling are true? (Select all that apply)
Which of these classes can be used to create custom exceptions? (Select all that apply)
Which of these classes can be used to create custom exceptions? (Select all that apply)
What happens if a FileNotFoundException is not handled?
What happens if a FileNotFoundException is not handled?
Which blocks can be used in a try-catch-finally structure? (Select all that apply)
Which blocks can be used in a try-catch-finally structure? (Select all that apply)
Flashcards
Exception Thrown
Exception Thrown
When an exception is thrown, an exception object is created containing information about the error.
Checked Exception
Checked Exception
A checked exception is a type of exception that must be either caught or declared in the method signature.
Throw Keyword
Throw Keyword
The 'throw' keyword is used to explicitly throw an exception in Java.
ArithmeticException
ArithmeticException
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Finally Block
Finally Block
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Uncaught Exception
Uncaught Exception
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Throwable Class
Throwable Class
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Unchecked Exception
Unchecked Exception
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Custom Exception
Custom Exception
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Throws IOException
Throws IOException
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Errors
Errors
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FileNotFoundException
FileNotFoundException
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Catch Block
Catch Block
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Try Block
Try Block
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UnHandled FileNotFoundException
UnHandled FileNotFoundException
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Study Notes
Multiple Choice Questions
- When an exception is thrown, an exception object is created containing information about the error.
FileNotFoundExceptionis a checked exception.- The
throwkeyword is used to explicitly throw an exception in Java. ArithmeticExceptionwill not cause a compile-time error if unhandled.- The purpose of the
finallyblock is to execute code regardless of whether an exception occurs - If there is no matching catch block for an exception, the program will terminate with an error message.
Throwableis the parent class of all exceptions and errors.- Unchecked exceptions typically represent logical errors in the program.
- A custom exception in Java is a subclass of
ExceptionorRuntimeException. - The method signature
public void readFile() throws IOExceptionindicates that the caller must handleIOException.
True/False Questions
- Unchecked exceptions do not need to be declared in the method signature.
- Errors indicate conditions the application cannot recover from.
- The
finallyblock is always executed, even if an exception occurs. - Custom exceptions should extend
ExceptionorRuntimeException. FileNotFoundExceptionis a subclass ofIOException.- Unchecked exceptions must be declared in the method signature: False
- A custom exception must extend either the Throwable or Error class: False, it should extend Exception or RuntimeException.
Select All That Apply
IOExceptionandFileNotFoundExceptionare checked exceptions.- It's true that all checked exceptions must be handled explicitly.
- It's also true that multiple catch blocks for a single try are possible.
ExceptionandRuntimeExceptionare classes used to create custom exceptions.- If
FileNotFoundExceptionis not handled, the compiler will report an error. - A
tryblock is mandatory, whilecatchandfinallyblocks are optional in a try-catch-finally structure.
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Description
Test your knowledge of Java exceptions with multiple-choice and true/false questions. Topics covered include exception handling, checked vs. unchecked exceptions, try-catch blocks, and custom exceptions. This quiz will help you understand how to effectively handle errors in your Java code.
