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What is the purpose of exception handling in a program?
What is the purpose of exception handling in a program?
To handle runtime errors in a program and allow it to continue executing even if an error occurs.
What is the difference between checked and unchecked exceptions?
What is the difference between checked and unchecked exceptions?
Checked exceptions are checked by the compiler at compile-time, while unchecked exceptions are not checked by the compiler at compile-time.
What is the purpose of the try block in a try-catch block?
What is the purpose of the try block in a try-catch block?
The try block contains the code that may throw an exception.
What is the purpose of the finally block in a try-catch-finally block?
What is the purpose of the finally block in a try-catch-finally block?
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What is the Exception Hierarchy in Java?
What is the Exception Hierarchy in Java?
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What is a best practice for handling exceptions?
What is a best practice for handling exceptions?
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How can custom exceptions be created in Java?
How can custom exceptions be created in Java?
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What is the purpose of the throw keyword in Java?
What is the purpose of the throw keyword in Java?
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Study Notes
Exception Handling in Java
What is Exception Handling?
- Exception handling is a mechanism to handle runtime errors in a program.
- It allows the program to continue executing even if an error occurs.
Types of Exceptions
- Checked Exceptions: These are exceptions that are checked by the compiler at compile-time.
- Unchecked Exceptions: These are exceptions that are not checked by the compiler at compile-time.
- Runtime Exceptions: These are exceptions that occur during the execution of a program.
Exception Handling Keywords
- try: A block of code where an exception may occur.
- catch: A block of code that handles the exception.
- finally: A block of code that is executed regardless of whether an exception occurs.
- throw: Used to throw an exception explicitly.
- throws: Used to declare an exception that a method may throw.
try-catch Block
- The try block contains the code that may throw an exception.
- The catch block contains the code to handle the exception.
- Multiple catch blocks can be used to handle different types of exceptions.
finally Block
- The finally block is executed regardless of whether an exception occurs.
- It is used to release resources, such as closing a file.
Exception Hierarchy
- Throwable: The parent class of all exceptions.
- Exception: The parent class of all checked exceptions.
- RuntimeException: The parent class of all unchecked exceptions.
Best Practices
- Handle specific exceptions: Catch specific exceptions rather than general exceptions.
- Handle exceptions close to the source: Handle exceptions as close to the source as possible.
- Log exceptions: Log exceptions to track and debug errors.
- Document exceptions: Document the exceptions that a method may throw.
Custom Exceptions
- Custom exceptions can be created by extending the Exception class.
- They can be used to provide more specific and meaningful error messages.
Exception Handling in Java
What is Exception Handling?
- A mechanism to handle runtime errors in a program, allowing it to continue executing even if an error occurs.
Types of Exceptions
- Checked Exceptions: Checked by the compiler at compile-time.
- Unchecked Exceptions: Not checked by the compiler at compile-time.
- Runtime Exceptions: Occur during the execution of a program.
Exception Handling Keywords
- try: A block of code where an exception may occur.
- catch: A block of code that handles the exception.
- finally: A block of code executed regardless of whether an exception occurs.
- throw: Used to throw an exception explicitly.
- throws: Used to declare an exception that a method may throw.
try-catch Block
- The try block contains code that may throw an exception.
- The catch block contains code to handle the exception.
- Multiple catch blocks can be used to handle different types of exceptions.
finally Block
- Executed regardless of whether an exception occurs.
- Used to release resources, such as closing a file.
Exception Hierarchy
- Throwable: The parent class of all exceptions.
- Exception: The parent class of all checked exceptions.
- RuntimeException: The parent class of all unchecked exceptions.
Best Practices
- Handle specific exceptions: Catch specific exceptions rather than general exceptions.
- Handle exceptions close to the source: Handle exceptions as close to the source as possible.
- Log exceptions: Log exceptions to track and debug errors.
- Document exceptions: Document the exceptions that a method may throw.
Custom Exceptions
- Can be created by extending the Exception class.
- Used to provide more specific and meaningful error messages.
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Description
Learn about exception handling in Java, including types of exceptions such as checked, unchecked, and runtime exceptions.
