Painful menstrual periods are periods in which a woman has crampy lower abdominal pain, sharp or aching pain that comes and goes, or possibly back pain. Some pain during your period is normal, but a large amount of pain is not. The medical term for painful menstrual periods is dysmenorrhea.
When an exception occurs, we say that the exception is thrown. For example, we say that Integer.parseInt(str) throws an exception of type NumberFormatException when the value of str is illegal. When an exception is thrown, it is possible to catch the exception and prevent it from crashing the program. This is done with a try..catch statement.
The Throwable class is the superclass of all errors and exceptions in the Java language. Only objects that are instances of this class (or one of its subclasses) are thrown by the Java Virtual Machine or can be thrown by the Java throw statement.