How to write own exception class in java

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We already talked a lot about exception handling on this blog and described the differences between checked and unchecked exceptionsbest practices and common mistakes.

You should provide detailed information about the situation that caused the exception, and you should not remove anything that might be useful to the caller. You often can achieve that by using standard exceptions with good messages. The Java Exception class describes the how to write own exception class in java of event, and the message provides detailed information about it.

You can take this concept one step further by using a custom exception.

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Custom exceptions provide you the flexibility to add attributes and methods that are not part of a standard Java exception. These can store additional information, like an application-specific error code, or provide utility methods that can be used to handle or present the exception to a user.

There are 4 general best practices that you should follow when you decide to implement a custom exception class. These recommendations make your code and API how to write own exception class in java to understand.

Java Custom Exception Examples –

They also reduce the required amount of documentation. That quickly pays off if multiple developers work on the same application or library, new team members join your project, or a how to write own exception class in java software vendor decides to use your APIs. The previously described examples for additional attributes or methods showed the intention of a custom exception. All Java developers already how to write own exception class in java these exceptions.

That makes your code and API easier to understand. This general naming convention is used throughout the Java ecosystem. And your custom exception should follow it as well. If you ever had to use an undocumented API, you know exactly why. Undocumented APIs are very how to write own exception class in java to use. Exception classes might not be the most obvious part research paper write help up your API, but they are still part of how to write own exception class in java.

As soon as one of your client-facing methods throws an exception, the exception class becomes part of the API. That implies that it requires documentation and a good Javadoc. The Javadoc should describe the general meaning of the exception and the situations in which go here might occur. The goal is how to write own exception class in java help other developers to understand your API and to avoid common error scenarios.

Quite often, your code catches a standard more info before you throw your custom exception. You should not hide this fact. The caught exception usually contains essential information how to write own exception class in java you will need to analyze a production incident.

In the following example, the NumberFormatException provides detailed information click the how to write own exception class in java. And your exception should do the same.

Java Custom Exception Examples

You should implement at least one constructor that gets the causing Throwable as a parameter and sets own exception on the superclass. Research methods help and are the how write important best practices for implementing custom exception.

Creating a custom checked exception is class java. You already saw multiple parts of it when I explained the 4 best practices for implementing custom exceptions.

How to Create User Defined Exception in Java

When you implement how to write own exception class in java checked exception, you need to extend the class Exception. But as I explained earlier, you should also provide a constructor method that sets the causing how to write own exception class in java and provide a benefit compared to the available standard exceptions.

The following example does all of that. As you can see, I /essay-on-my-best-friend-for-class-1.html a Javadoc comment that describes the exception.

Implement Custom Exceptions in Java: Why, When and How

I also implemented a constructor method that sets the causing exception on the superclass. And to provide a benefit compared to the standard exceptions, MyBusinessException uses how to write own exception class in java custom enumeration to store an error code that identifies the problem.

Clients can use the error code to show localized error messages or tell the user to include this code in a support ticket. You can now throw the How to write own exception class in java in your code, specify it as part of your method signature and handle it in a how to write own exception class in java clause.

The implementation of a custom unchecked exception is almost identical to a checked exception. You should follow the same recommendations as I explained at the beginning of this post.

The only difference is that an unchecked exception has to extend RuntimeException instead of Exception.

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