This README provides brief answers to common questions about exception handling in Java.
- Use try-catch blocks to encapsulate code that may throw exceptions.
- Catch specific exceptions or groups of exceptions to handle them appropriately.
- Optionally, include a finally block for cleanup operations.
- Ensures graceful handling of errors, preventing crashes.
- Provides feedback to users about what went wrong.
- Helps maintain software stability and reliability.
java.lang.Throwable
serves as the superclass for both exceptions and errors.
java.lang.Exception
is the superclass for all exceptions, excluding errors.
- Keywords include try, catch, finally, throw, and throws.
- Includes checked exceptions (Exception class and subclasses) and unchecked exceptions (RuntimeException and its subclasses).
- Yes, statements can be written between try and catch blocks.
- The Try-Catch pattern is commonly used for exception handling.
- The finally block ensures that certain code executes regardless of whether an exception occurred.
- Code in finally may not execute if the JVM exits abruptly or if there's an infinite loop or System.exit() call within try or catch.
- Yes, try without catch is allowed if followed by finally or catch.
- An exception handler is a block of code responsible for catching and handling exceptions.
- Typically found in the main method or methods at the top of the call stack.
- No, try must be followed by finally or catch blocks.
- Starts with Throwable, which has Error and Exception subclasses, with Exception further subclassing into checked and unchecked exceptions.
- First throws ArithmeticException, second prints Infinity due to floating-point behavior.
- Errors are irrecoverable conditions, while exceptions represent errors in code or unexpected conditions.
- Checked exceptions are checked at compile-time, while unchecked exceptions are not.
- java.lang.Exception can handle both checked exceptions.
- throw is used to raise an exception, while throws is used to declare exceptions that a method may throw.
- Use the throw keyword followed by the exception object.
- Must be caught using try-catch or declared using throws in the method signature.
- Use try-catch or declare exceptions using throws in the method signature.
- Extend Exception class or its subclasses to create custom exceptions.
- Separate exception types using the pipe symbol (|).
- Automatically manages resources, closing them at the end of try block.
- Automatically closes declared resources at the end of try block.
- Catch specific exceptions, provide meaningful error messages, log exceptions, and use try-with-resources for resource management.