Exception Handling Custom exceptions | Summary and Q&A

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August 16, 2023
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Exception Handling Custom exceptions

TL;DR

Custom exceptions in Java are user-defined exceptions that can be checked or unchecked, created by extending a predefined exception class.

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Key Insights

  • 👤 Custom exceptions in Java are user-defined exceptions that extend a predefined exception class.
  • 🍵 By creating custom exceptions, developers can handle specific conditions or requirements in their applications.
  • 🛃 Custom exceptions can be used to enforce criteria for data input and processing.
  • 🍵 They can be categorized as checked or unchecked, depending on whether the compiler enforces handling or not.
  • 💨 Custom exceptions provide a way to handle exceptions in a more structured and specific manner.
  • 🥳 Custom exceptions can be reused in multiple parts of an application.
  • 👻 The creation of custom exceptions allows for better organization and readability of code.

Transcript

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Questions & Answers

Q: What is a custom exception in Java?

A custom exception in Java is a user-defined exception created by extending a predefined exception class. It allows developers to handle specific conditions or requirements in an application.

Q: How do you create a custom exception in Java?

To create a custom exception in Java, you need to create a class that extends a predefined exception class. By adding custom methods and properties to the class, you can customize the behavior of the exception.

Q: What is the difference between a checked and unchecked custom exception?

A checked custom exception is a user-defined exception that inherits from a checked exception class. The compiler forces the handling of checked exceptions, ensuring that the exception is either caught or declared in the method signature. Unchecked custom exceptions, on the other hand, do not need to be explicitly handled.

Q: How can custom exceptions be used in Java applications?

Custom exceptions can be used to enforce specific criteria or requirements for data input and processing. For example, in a social networking website, a custom exception can be thrown when the age input by the user is below the specified limit to prevent access to certain features.

Summary & Key Takeaways

  • Custom exceptions in Java are created by extending a predefined exception class and are used to handle specific conditions in an application.

  • By creating a custom exception class, developers can enforce certain criteria or requirements for data input and processing.

  • Custom exceptions can be classified as checked or unchecked, depending on whether the compiler forces the handling of the exception or not.

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