ExceptHand.java

class Test {
	static int div(int a, int b) {
		return a / b;
	}

	public static void main(String args[]) {
		try {
			int a = args.length;
			int b = 42;
			b = div(a, b);
		} catch (ArithmeticException e) {
			System.out.println("Exception: " + e);
		}
	}
}

class TestExcept {
	public static void getExcept() {
		try {
			throw new NullPointerException("Exception test");
		} catch (NullPointerException e) {
			System.out.println("Exception caught: " + e);
		}
	}

	public static void main(String args[]) {
		try {
			getExcept();
		} catch (NullPointerException e) {
			System.out.println("Caught inside main: " + e);
		}
	}
}

class TestTwoExcept {
	public static void nestedTry() {
		try {
			try {
				throw new NullPointerException("called within the nested try");
			} catch (ArithmeticException e) {
				System.out.println("Caught in inener catch: " + e);
			}
		} catch (ArithmeticException e) {
			System.out.println("Caught exception in outer catch: " + e);
		} catch (NullPointerException e) {
			System.out.println("Caught exception in outer catch: " + e);
		}
	}

	public static void main(String args[]) {
		nestedTry();
	}
}

class TestUserExcept {
	public static int div(int a, int b) throws DivByZero {
		int res;
		System.out.println("Division method called");
		if (b == 0) {
			throw new DivByZero(b);
		} else {
			res = a / b;
		}
		return res;
	}

	public static void main(String args[]) {
		int a = 10, b = 0;
		try {
			int res = div(a, b);
			System.out.println("Division of " + a + " and " + b + " is: " + res);
		} catch (DivByZero e) {
			System.out.println("Exception caught: " + e);
		}
	}
}

class DivByZero extends Exception {
	private int divisor;

	DivByZero(int a) {
		divisor = a;
	}

	public String toString() {
		return "Divide by zero attempt caught!";
	}
}