14.3 Exception Class

Exception Class Hierarchy

1. All Exceptions and Errors are subclasses of the Throwable superclass, which gives programs the ability to “throw” errors/exceptions.

2. All checked exceptions are subclasses of the Exception class.

3. All unchecked exceptions are subclasses of the RuntimeException class.

4. Errors will not be discussed in detail, but these signify serious and/or abnormal problems that you should not try to catch because it could potentially be dangerous. The purpose of this class is mainly to provide information about the error.

User-Defined Exceptions

public class MyException extends Exception {
}

public static void main(String[] args) {
		try {
					call(null);
		} catch(MyException e) {
					System.out.println("Caught MyException");
		}
}

public static void call(String s) throws MyException {
		if (s == null)
					throw new MyException();
}

throw new ArithmeticException("divide by zero error");

public class MyException extand Exception {
			
			public MyException() {}
		
			public MyException(Strong message) {
						super(message);
			}
}