Emulated Sum Type in Java as described by Lukas Eder and Daniel Dietrich

EmulatedSumType.java

import java.math.BigInteger;
import java.util.function.Consumer;

// http://blog.jooq.org/2016/02/16/an-ingenious-workaround-to-emulate-sum-types-in-java/
public class EmulatedSumType {

	static class Tuple3<T1, T2, T3> {
		final T1 v1;
		final T2 v2;
		final T3 v3;

		public Tuple3(T1 t1, T2 t2, T3 t3) {
			v1 = t1;
			v2 = t2;
			v3 = t3;
		}

		// Lots of useful stuff here
	}

	static <T, T1 extends T, T2 extends T, T3 extends T> void forEach(Tuple3<T1, T2, T3> tuple,
			Consumer<? super T> consumer) {
		consumer.accept(tuple.v1);
		consumer.accept(tuple.v2);
		consumer.accept(tuple.v3);
	}
	
	public static void main(final String[] bla) {
		Tuple3<BigInteger, Long, Integer> tuple3 = new Tuple3<BigInteger, Long, Integer>(BigInteger.TEN, 1L, 3);
		forEach(tuple3, v -> System.out.println(v.doubleValue()));
	}
}