package holding;

/**

* RUN:

* javac holding/AdapterMethodIdiom.java && java holding.AdapterMethodIdiom

* OUTPUT:

* To be or not to be

* be to not or be To

*/

import java.util.*;

public class AdapterMethodIdiom {

public static void main(String[] args) {

ReversibleArrayList<String> ral = new ReversibleArrayList<String>(Arrays.asList("To be or not to be".split(" ")));

// using direct iterator

for (String s : ral) {

System.out.print(s + " ");

}

System.out.println();

// using reversed iterator

for (String s : ral.reversed()) {

System.out.print(s + " ");

}

System.out.println();

}

}

class ReversibleArrayList<T> extends ArrayList<T> {

public ReversibleArrayList(Collection<T> c) {

super(c);

}

public Iterable<T> reversed() {

return new Iterable<T>() {

public Iterator<T> iterator() {

return new Iterator<T>() {

int current = size() - 1;

public boolean hasNext() {

return current > -1;

}

public T next() {

return get(current--);

}

public void remove() {

throw new UnsupportedOperationException();

}

};

}

};

}

}