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JavaIntermediate#exceptions
JavaBeginner#exceptions
What is a custom exception and how do you create one?
A user-defined exception class extending Exception (checked) or RuntimeException (unchecked), used to represent domain-specific error conditions with more meaningful names and data.
Example
class InsufficientFundsException extends RuntimeException {
InsufficientFundsException(String msg) { super(msg); }
}
throw new InsufficientFundsException("Balance too low");