What is a user defined exception?
User defined exceptions may be implemented by defining a new exception class by extending the Exception class. public class MyException extends Exception { /* class definition of constructors goes here */ public MyException() { super(); } public MyException (String errorMessage) { super (errorMessage); } } Throw and/or throws statement is used to signal the occurrence of an exception. To throw an exception: throw new MyException(I threw my own exception.
At times, depending on the need of a program, a programmer might need to create his own set of exceptions. These exceptions are called as the User defined Exceptions. The user defined exception class should extend from Exception class. You may override the toString() method in order to display a user friendly message. Eg: BloodGroupException.java public class BloodGroupException extends Exception { private String gp; public BloodGroupException (String gp){ this.
