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How To Create User Defined Exception In Java

Last Updated : Jul 1, 2023

How To Create User Defined Exception In Java

In this article we will show you the solution of how to create user defined exception in java, creating your custom exception class and using the keyword "throw" to throw that exception is known as a user-defined exception or custom exception.

The class Exception can be extended to achieve this.

None of the aforementioned methods from the Exception class, which are available to your derived class, need to be overridden.

But in reality, you'll need to make some adjustments to suit your programming requirements.

Java requires that we build a class and extend it with the Exception class from of the java.lang package in order to generate a custom exception.

To make our exception class's benefits and identification easier to understand, it's usually a good idea to add comments or adhere to naming conventions.

The process for writing a Java user-defined exception is outlined below.

Checked exceptions are the class Exception as well as any subclasses that aren't also subclasses of RuntimeException.

Checked exceptions must be declared in the throws clause of a method or function Object() { [native code] } if they are thrown by the method or constructor's execution and propagate outside of the technique or function Object() { [native code] } boundary.

An inaccuracy is a problem, bug, or human-made mistake that occurs during the execution of a programme.

An exception disrupts the program's flow and causes it to terminate abnormally. It is not recommended to terminate the programme abnormally, so we must handle these exceptions.

For handling exceptions, Java provides the Java.lang.Exception class, which inherits this same methods and properties of the Object and Throwable classes.

Step By Step Guide On How To Create User Defined Exception In Java :-

public class TalkersCode extends Exception{
}
public class SimpleCustomException extends Exception {
    SimpleCustomException(String msg) {
     super(msg);
 }
}
  1. Pass the Exception Message to Super Class Constructor and Retrieve It Using the getMesssage() Method.
  2. Using the super keyword, we called the parent class function Object() { [native code] } in the code above.
  3. Then the custom class is extended by the Exception class, it is considered to be the parent class.
  4. Then we specify that the function Object() { [native code] } of the Exception class expects a string as a parameter.
  5. Then it will create a new exception that contains the specified message, which can later be retrieved with the getMessage() method.

Conclusion :-

Creating your custom exception class and using the keyword "throw" to throw that exception is known as a user-defined exception or custom exception.

The class Exception can be extended to achieve this.

I hope this article on how to create user defined exception in java helps you and the steps and method mentioned above are easy to follow and implement.

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