/**
 * java 自定义异常类
 */
class MyException extends Exception {
	private int detail;

	MyException(int a) {
		detail = a;
	}

	public String toString() {
		return "MyException[" + detail + "]";
	}
}

class ExceptionDemo {
	static void compute(int a) throws MyException {
		System.out.println("called compute(" + a + ").");
		if (a > 10)
			throw new MyException(a);
		System.out.println("normal exit.");
	}

	public static void main(String args[]) {
		try {
			compute(1);
			compute(20);
		} catch (MyException e) {
			System.out.println("caught " + e);
		}
	}
}