public class TryThrowCatchFinally1 {

	public static void main(String[] args) {
		try {
			final double dividend = Double.MAX_VALUE;
			final double divisor = 2 * Math.random();

			if (divisor == 0.0) {
				DivideByZero dividebyzero = new DivideByZero();
				throw dividebyzero;

				/*
				Could write the above as
				throw new DivideByZero();
				*/
			}

			if (divisor < 1.0) {
				throw new OverFlow();
			}

			System.out.println(dividend/divisor);
		}

		catch (DivideByZero d) {
			System.err.println(d.getMessage());
		}

		catch (OverFlow ov) {
			System.err.println(ov.getMessage());
		}

		finally {
			//Arrive here if no exception was thrown,
			//or if DivideByZero or OverFlow was thrown,
			//or if any other excpetion was thrown.

			System.out.println("All done.");
		}
	}
}

/*
Class DividebyZero is derived from class Exception.
An object of class Exception can hold a string,
and has a method named getMessage.
*/

class DivideByZero extends Exception {
	public DivideByZero() {		//constructor
		super("can't divide by zero");
	}
}

class OverFlow extends Exception {
	public OverFlow() {
		super("quotient would overflow");
	}
}