Pattern matching in Java via exceptions

Main.java

public class Main {

	public static void main(String[] args) {
		System.out.println(example());
	}

	public static String example() {
		try {
			throw match();
		} catch (Int x) {
			return "This is an integer. Its value is " + x.value;
		} catch (Str str) {
			return "This is a string. Its value is " + str.value;
		}
	}

	public static Matchable match() {
		throw new Int(5);
	}
}

class Matchable extends Error {

}

class Int extends Matchable {
	final int value;

	Int(int value) {
		this.value = value;
	}
}

class Str extends Matchable {
	final String value;

	Str(String value) {
		this.value = value;
	}
}