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//: holding/AdapterMethodIdiom.java

// The "Adapter Method" idiom allows you to use foreach

// with additional kinds of Iterables.

import java.util.*;

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() { // Not implemented

throw new UnsupportedOperationException();

}

};

}

};

}

}

public class AdapterMethodIdiom {

public static void main(String[] args) {

ReversibleArrayList<String> ral =

new ReversibleArrayList<String>(

Arrays.asList("To be or not to be".split(" ")));

// Grabs the ordinary iterator via iterator():

for(String s : ral)

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

System.out.println();

// Hand it the Iterable of your choice

for(String s : ral.reversed())

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

}

} /* Output:

To be or not to be

be to not or be To

*///:~