Bifalgorithm post · Computer science one · Creating Custom Exceptions

How do you create a custom exception in Java?

How do you create a custom exception in Java? (Computer science one · Creating Custom Exceptions) — "To create your own exceptions, you need to create a new cl…

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Creating custom exceptions in Java
Create a new class to represent the exception.
Make the class extend RuntimeException by using the extends keyword.
The custom exception becomes a subclass or subtype of RuntimeException.
This relationship is an example of inheritance in object-oriented programming.
In the quadratic-polynomial example, the roots may be complex numbers.
A ComplexRootException class can represent this error situation.
The class includes a constructor that takes an error message.
The constructor passes the error message to the superclass with super(errorMessage).

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How do you create a custom exception in Java?

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Computer science one

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sam23

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"To create your own exceptions, you need to create a new class to represent the exception and make it extend RuntimeException by using the keyword extends. This makes your exception a subclass or subtype of the RuntimeException. This is a concept known as inheritance in OOP. Consider the example in the previous chapter of computing the roots of a quadratic polynomial. One possible error situation is when the roots are complex numbers. We could define a new Java class as follows.\n\npublic class ComplexRootException extends RuntimeException {\n\n/**\n\n* Constructor that takes an error message\n\n*/\n\npublic ComplexRootException(String errorMessage) {\n\nsuper(errorMessage);\n\n}\n\n}"

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