Tuple3.java

public class TupleTest {

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

        public Tuple3(T1 v1, T2 v2, T3 v3) {
            this.v1 = v1;
            this.v2 = v2;
            this.v3 = v3;
        }
    }

    static <T> void forEach(Tuple3<? extends T, ? extends T, ? extends T> tuple, Consumer<? super T> consumer) {
        consumer.accept(tuple.v1);
        consumer.accept(tuple.v2);
        consumer.accept(tuple.v3);
    }

    public static void main(String[] args) {
        Tuple3<Integer, Long, Byte> t = new Tuple3<>(42, 0L, (byte) 1);
        forEach(t, e -> System.out.println(e.doubleValue()));
    }

}