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Java Exception Handling

This README provides brief answers to common questions about exception handling in Java.

1. How to Handle Exceptions 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.

2. Why is Exception Handling Important?

  • Ensures graceful handling of errors, preventing crashes.
  • Provides feedback to users about what went wrong.
  • Helps maintain software stability and reliability.

3. Superclass for All Exceptions and Errors

  • java.lang.Throwable serves as the superclass for both exceptions and errors.

4. Superclass for All Exceptions

  • java.lang.Exception is the superclass for all exceptions, excluding errors.

5. Keywords for Exception Handling in Java

  • Keywords include try, catch, finally, throw, and throws.

6. Different Types of Exceptions in Java

  • Includes checked exceptions (Exception class and subclasses) and unchecked exceptions (RuntimeException and its subclasses).

7. Can Statements be Written Between try and catch Blocks?

  • Yes, statements can be written between try and catch blocks.

8. Common Design Pattern for Exception Handling

  • The Try-Catch pattern is commonly used for exception handling.

9. Purpose of finally Block

  • The finally block ensures that certain code executes regardless of whether an exception occurred.

10. Scenarios Where Code in finally is Not Executed

  • 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.

11. Is try Without a catch Allowed?

  • Yes, try without catch is allowed if followed by finally or catch.

12. Definition of Exception Handler in Java

  • An exception handler is a block of code responsible for catching and handling exceptions.

13. Code that Catches the Exception Thrown by JVM

  • Typically found in the main method or methods at the top of the call stack.

14. Can try be Used Without finally and catch Blocks?

  • No, try must be followed by finally or catch blocks.

15. Hierarchy of Exception Handling Classes

  • Starts with Throwable, which has Error and Exception subclasses, with Exception further subclassing into checked and unchecked exceptions.

16. Difference between System.out.println(1/0) and System.out.println(2.0/0)

  • First throws ArithmeticException, second prints Infinity due to floating-point behavior.

17. Difference between Error and Exception

  • Errors are irrecoverable conditions, while exceptions represent errors in code or unexpected conditions.

18. Difference between Checked and Unchecked Exceptions

  • Checked exceptions are checked at compile-time, while unchecked exceptions are not.

19. Exception Class to Handle Both Checked Exceptions

  • java.lang.Exception can handle both checked exceptions.

20. Difference between throw and throws Keywords

  • throw is used to raise an exception, while throws is used to declare exceptions that a method may throw.

21. How to Throw an Exception from a Method?

  • Use the throw keyword followed by the exception object.

22. What Happens When a Checked Exception is Thrown from a Method?

  • Must be caught using try-catch or declared using throws in the method signature.

23. Options to Eliminate Compilation Errors When Handling Checked Exceptions

  • Use try-catch or declare exceptions using throws in the method signature.

24. How to Create a Custom Exception?

  • Extend Exception class or its subclasses to create custom exceptions.

25. Handling Multiple Exceptions in a Single catch Block

  • Separate exception types using the pipe symbol (|).

26. Explanation of try with Resources

  • Automatically manages resources, closing them at the end of try block.

27. How does try with Resources Work?

  • Automatically closes declared resources at the end of try block.

28. Exception Handling Best Practices

  • Catch specific exceptions, provide meaningful error messages, log exceptions, and use try-with-resources for resource management.

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