For "Java Infinite Streams" discussion on Coursera

gistfile1.java

class Cons<T, R> {

    T car;
    R cdr;

    Cons(T car, R cdr) {
	this.car = car;
	this.cdr = cdr;
    }

}

interface Supplier<T> {
    T apply();
}

interface Stream<T> extends Supplier<Cons<T, Stream<T>>> {

}

class Main {

    static Stream<Integer> naturalsFrom(final int n) {
	return new Stream<Integer>() {
	    public Cons<Integer, Stream<Integer>> apply() {
		return new Cons<Integer, Stream<Integer>>(n, naturalsFrom(n+1));
	    }
	};
    }

    public static void main(String args[]) {	
	Stream<Integer> st = naturalsFrom(1);

	for( int ii = 0 ; ii < 10 ; ii++) {
	    Integer car = st.apply().car;
	    st = st.apply().cdr;
	    System.out.println(car);
	}
    }

}