Chapter 14: Exception and Event Handling

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Questions and Answers

What keyword is used to raise an exception in C++?

raise

catch

exception

throw (correct)

What happens to an unhandled exception in a function?

It re-raises itself within the same function.

It is propagated to the calling function. (correct)

It terminates the program immediately.

It is ignored and execution continues.

Which of the following statements about exception handlers is true?

The catch function can take an ellipsis to handle all exceptions. (correct)

Handlers cannot use formal parameters to transfer information.

All handlers must have the same formal parameter type.

Handlers can only handle one specific type of exception.

What is the role of the formal parameter in a catch block?

It can differentiate between multiple handlers. Signup and view all the answers

When an exception is thrown without an operand inside a handler, what does it do?

It re-raises the current exception. Signup and view all the answers

What is a significant design feature of C++ exception handling?

User-defined exceptions can be specified by the programmer. Signup and view all the answers

Which statement regarding predefined exceptions is true?

They can be handled by user-defined exception handlers. Signup and view all the answers

How are catch blocks structured in C++?

Each must contain a unique formal parameter. Signup and view all the answers

What event is associated with the ItemEvent class?

Clicking a checkbox Signup and view all the answers

Which interface must be implemented to handle ItemEvent events in Java?

ItemListener Signup and view all the answers

In C#, what must all event handlers return?

void Signup and view all the answers

How are radio buttons typically created in a C# Windows Forms application?

By subclassing the RadioButton class Signup and view all the answers

What property is used to determine if a radio button is checked in C#?

Checked Signup and view all the answers

Which of the following correctly registers an event handler for a radio button in C#?

plain.CheckedChanged += new EventHandler(rb_CheckedChanged); Signup and view all the answers

In C#, what does an EventHandler object typically reference?

A method that takes parameters of object and EventArgs Signup and view all the answers

Which action does the CheckedChanged event signify for a radio button in C#?

The button's checked state changed Signup and view all the answers

What is the purpose of the assert statement in Python?

To raise exceptions based on Boolean expressions Signup and view all the answers

In Ruby, what is the base class for user-handled exceptions?

StandardError Signup and view all the answers

Which of the following statements is true about Ruby exception handling?

The rescue keyword is used to define exception handlers. Signup and view all the answers

What is the role of an event handler in programming?

To execute code in response to an event Signup and view all the answers

What is a JTextField in Java's Swing GUI?

An object representing a text box Signup and view all the answers

How does the Java event model inform a listener about an event?

By sending a message from an event generator Signup and view all the answers

Which statement about exception handling in Ruby is correct?

The retry statement reruns the code that raised an exception. Signup and view all the answers

What is the function of layout manager objects in Java Swing?

To control the placement of GUI components Signup and view all the answers

What occurs in a language without exception handling when an exception arises?

Control transfers to the operating system and the program is terminated. Signup and view all the answers

What is the primary benefit of built-in exception handling?

It encourages consideration of various possible errors. Signup and view all the answers

What term describes the code unit that processes exceptions after they are detected?

Exception handler Signup and view all the answers

Which of the following is a method to handle exceptions in languages without built-in support?

Use return values to indicate error status. Signup and view all the answers

What is an unusual event detectable by hardware or software that may require special processing called?

Exception Signup and view all the answers

How does exception propagation benefit programmers?

By allowing the reuse of exception handling code. Signup and view all the answers

Which design issue involves determining how an exception occurrence is linked to an exception handler?

Exception binding Signup and view all the answers

What can an exception handler do that basic error checking cannot?

Handle multiple types of errors uniformly. Signup and view all the answers

What is the main purpose of an assertion in a program?

To declare a boolean expression regarding the program state Signup and view all the answers

What happens when an assertion evaluates to false?

An AssertionError is thrown Signup and view all the answers

In Python, which block executes regardless of whether an exception is raised?

finally block Signup and view all the answers

Which class is the base class for all exceptions in Python?

BaseException Signup and view all the answers

What happens when an unhandled exception occurs in Python?

It gets propagated to the nearest enclosing try block Signup and view all the answers

Which statement about the finally clause in exception handling is accurate?

It can only be used in conjunction with a try block Signup and view all the answers

What types of exceptions does a handler for a named exception also handle?

The named exception and all of its subclasses Signup and view all the answers

Which of the following is NOT a predefined subclass of Exception in Python?

FileNotFoundError Signup and view all the answers

What happens if no handler is found for an exception in Java?

The exception is propagated to the method's caller. Signup and view all the answers

Which type of exceptions does the Java throws clause specifically address?

Checked exceptions that must be handled or declared. Signup and view all the answers

What is true regarding the use of the finally clause in Java?

It ensures a block of code runs regardless of exceptions. Signup and view all the answers

What are the checked exceptions that a method may throw required to do?

They must be declared in the throws clause or handled. Signup and view all the answers

Which option correctly describes the binding of an exception to a handler in Java?

It binds to the first handler with a matching or ancestor class. Signup and view all the answers

What must a method that overrides another method's exception behavior do?

Declare the same exceptions or fewer in its throws clause. Signup and view all the answers

If a method calls another method with a checked exception, which option is NOT a valid way to handle it?

Ignore it completely and let it propagate. Signup and view all the answers

What class types are categorized as unchecked exceptions in Java?

Error and RuntimeException classes. Signup and view all the answers

What is the purpose of using custom exceptions in a system?

To provide detailed error handling specific to the application's domain. Signup and view all the answers

In the checkout application example using Java, what does the ActionListener do?

It performs actions based on user interactions, like placing an order. Signup and view all the answers

Which method in the C# example is responsible for periodically updating the price displayed?

UpdatePrice Signup and view all the answers

What is one key benefit of implementing the 'finally' block in exception handling?

It allows for cleanup actions to be executed regardless of whether an exception occurred. Signup and view all the answers

What is the role of an event-driven system in real-time data processing?

To capture and respond to events instantly as they occur. Signup and view all the answers

What exception is raised in the Ruby example for invalid tracking numbers?

InvalidTrackingNumberException Signup and view all the answers

Why is it important for a GUI application to handle user inputs effectively?

To improve user experience through responsiveness. Signup and view all the answers

How does the Java Swing GUI application ensure the visibility of the frame?

By calling setVisible(true) Signup and view all the answers

What does the timer in the C# stock trading example typically do?

Invokes the price update method at specified intervals. Signup and view all the answers

What kind of exceptions does the 'DatabaseConnectionException' represent?

Errors related to database connectivity issues. Signup and view all the answers

What exception is raised when a withdrawal amount exceeds the account balance?

InsufficientFundsException Signup and view all the answers

Which component of Java exception handling allows for cleanup actions to be performed regardless of whether an exception was thrown?

finally block Signup and view all the answers

What is the purpose of logging exceptions in a banking application?

To audit transaction errors and improve system reliability Signup and view all the answers

In the context of handling user interactions on an e-commerce website, what might occur if event handling is not implemented correctly?

Unprocessed events leading to transaction failures Signup and view all the answers

How can the use of custom exceptions enhance the clarity of code in a banking application?

By providing specific error information and improving code readability Signup and view all the answers

What event must be managed during the checkout process on an e-commerce platform?

Validating the cart before processing the order Signup and view all the answers

What happens after an exception is caught in the code example provided?

An error message is printed and the transaction is logged Signup and view all the answers

What occurs if a valid account number is not provided during a transaction in the banking application?

An InvalidAccountException is raised Signup and view all the answers

Study Notes

Chapter 14: Exception Handling and Event Handling

Exception handling in programming languages deals with unexpected events (exceptions) during program execution.
Languages without exception handling terminate the program when an exception occurs, displaying an error message to the operating system.
Programming languages with exception handling allow programs to "trap" some exceptions, fixing the problem and continuing execution.
An exception is an unusual event, either erroneous or not, detectable by hardware or software, that requires special processing.
Exception handling code is called an exception handler.
Alternatives to exception handling include sending an auxiliary parameter, using return values to indicate subprogram status, passing a label parameter to all subprograms, or passing an exception handling subprogram to all subprograms.
Built-in exception handling offers advantages: error detection code is concise; programs consider various possible errors; and exception propagation enables high-level code reuse.
Design issues in exception handling include: how exception handlers are specified, their scope, how exceptions are bound to handlers, information passed to handlers, continuation after handling, and finalization.
User-defined exceptions can be specified in some languages; some languages have default exception handlers; some exceptions can be explicitly raised.
Hardware-detectable errors can sometimes be handled as exceptions.
Some exceptions can be disabled.
Exception handling control flow involves executing code, binding to exception handlers, and handling possible continuations or terminations.
C++ added exception handling in 1990, based on similar designs in other languages.
C++ exception handlers use a try block of code followed by catch blocks for handling specific exceptions.
The catch function can accept named parameters, helping to differentiate handling of different exception types.
Exceptions are raised explicitly using the throw statement.
Unhandled exceptions are propagated to the caller.
Handling continues after an exception handler's completion, optionally continuing from where it left off or otherwise handling it.
Some languages allow exceptions to be user-defined or specified, and handled differently in different function calls.
Java exception handling is object-oriented, based on the Throwable class.
Java has two subclasses of Throwable: Error and Exception.
Error exceptions are typically system-level, or unhandled.
Exception exceptions are usually user-defined.
Java exception handlers require that exceptions be declared with the same class or subclasses; exception handling is generally simpler in Java than in C++.
Error handling or other exceptions can be handled in try constructs.
The finally clause in Java always executes, regardless of whether an exception was handled or not—useful for cleanup tasks.
Assert statements evaluate boolean expressions; if true, nothing happens; but, if false, a specific exception (AssertionError) is thrown.
The various types of exceptions, throws clause, and finally clause, and Java interpreter exception handling are generally useful for error prevention.
Python uses exceptions as objects derived from the Exception class; Python predefined exceptions include ArithmeticError, LookupError, OverflowError, ZeroDivisionError, FloatingPointError, IndexError, and KeyError.
Python's try-except-else-finally blocks handle exceptions.
Ruby also treats exceptions as objects with a StandardError base type; exceptions are raised using the raise statement; handling is done by placing rescue blocks at the end of begin...end blocks.
Ruby supports explicit retry.

Introduction to Event Handling

An event is a notification that a specific action has occurred, like a mouse click.
Event handling involves executing code in response to an event.
Java Swing, GUI components (like text boxes, radio buttons, and dropdowns) are part of an event handling process, displaying complex layered structures including the JFrame, JPanel, JTextField, JRadioButton, and JComboBox.
The Java Event Model uses event listeners and "event generating" methods for communication.
Java uses interfaces like ItemListener with methods triggered based on GUI element interactions, so, code runs as an event-generated action.
C# event handling is similar to Java, with a protocol of having void return types and two object and EventArgs parameters.
C# uses delegates to register event handlers.

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This quiz covers Chapter 14 focusing on exception handling and event handling in programming. Learn how different programming languages manage unexpected events and explore various strategies for error detection. Understand the advantages of built-in exception handling and its impact on program execution.

Chapter 14: Exception and Event Handling

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Questions and Answers

What keyword is used to raise an exception in C++?

What happens to an unhandled exception in a function?

Which of the following statements about exception handlers is true?

What is the role of the formal parameter in a catch block?

When an exception is thrown without an operand inside a handler, what does it do?

What is a significant design feature of C++ exception handling?

Which statement regarding predefined exceptions is true?

How are catch blocks structured in C++?

What event is associated with the ItemEvent class?

Which interface must be implemented to handle ItemEvent events in Java?

In C#, what must all event handlers return?

How are radio buttons typically created in a C# Windows Forms application?

What property is used to determine if a radio button is checked in C#?

Which of the following correctly registers an event handler for a radio button in C#?

In C#, what does an EventHandler object typically reference?

Which action does the CheckedChanged event signify for a radio button in C#?

What is the purpose of the assert statement in Python?

In Ruby, what is the base class for user-handled exceptions?

Which of the following statements is true about Ruby exception handling?

What is the role of an event handler in programming?

What is a JTextField in Java's Swing GUI?

How does the Java event model inform a listener about an event?

Which statement about exception handling in Ruby is correct?

What is the function of layout manager objects in Java Swing?

What occurs in a language without exception handling when an exception arises?

What is the primary benefit of built-in exception handling?

What term describes the code unit that processes exceptions after they are detected?

Which of the following is a method to handle exceptions in languages without built-in support?

What is an unusual event detectable by hardware or software that may require special processing called?

How does exception propagation benefit programmers?

Which design issue involves determining how an exception occurrence is linked to an exception handler?

What can an exception handler do that basic error checking cannot?

What is the main purpose of an assertion in a program?

What happens when an assertion evaluates to false?

In Python, which block executes regardless of whether an exception is raised?

Which class is the base class for all exceptions in Python?

What happens when an unhandled exception occurs in Python?

Which statement about the finally clause in exception handling is accurate?

What types of exceptions does a handler for a named exception also handle?

Which of the following is NOT a predefined subclass of Exception in Python?

What happens if no handler is found for an exception in Java?

Which type of exceptions does the Java throws clause specifically address?

What is true regarding the use of the finally clause in Java?

What are the checked exceptions that a method may throw required to do?

Which option correctly describes the binding of an exception to a handler in Java?

What must a method that overrides another method's exception behavior do?

If a method calls another method with a checked exception, which option is NOT a valid way to handle it?

What class types are categorized as unchecked exceptions in Java?

What is the purpose of using custom exceptions in a system?

In the checkout application example using Java, what does the ActionListener do?

Which method in the C# example is responsible for periodically updating the price displayed?

What is one key benefit of implementing the 'finally' block in exception handling?

What is the role of an event-driven system in real-time data processing?

What exception is raised in the Ruby example for invalid tracking numbers?

Why is it important for a GUI application to handle user inputs effectively?

How does the Java Swing GUI application ensure the visibility of the frame?

What does the timer in the C# stock trading example typically do?

What kind of exceptions does the 'DatabaseConnectionException' represent?

What exception is raised when a withdrawal amount exceeds the account balance?

Which component of Java exception handling allows for cleanup actions to be performed regardless of whether an exception was thrown?

What is the purpose of logging exceptions in a banking application?

In the context of handling user interactions on an e-commerce website, what might occur if event handling is not implemented correctly?

How can the use of custom exceptions enhance the clarity of code in a banking application?

What event must be managed during the checkout process on an e-commerce platform?

What happens after an exception is caught in the code example provided?

What occurs if a valid account number is not provided during a transaction in the banking application?

Study Notes

Chapter 14: Exception Handling and Event Handling

Introduction to Event Handling

Studying That Suits You

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