下面是迭代器模式的一个小例子:
interface Selector { boolean end(); Object current(); void next(); } public class Sequence { private Object[] items; private int next = 0; public Sequence(int size) { items = new Object[size]; } public void add(Object x) { if (next < items.length) items[next++] = x; } private class SequenceSelector implements Selector { private int i = 0; public boolean end() { return i == items.length; } public Object current() { return items[i]; } public void next() { if (i < items.length) i++; } } public Selector selector() { return new SequenceSelector(); } public static void main(String[] args) { Sequence sequence = new Sequence(10); for (int i = 0; i < 10; i++) sequence.add(Integer.toString(i)); Selector selector = sequence.selector(); while (!selector.end()) { System.out.print(selector.current() + " "); selector.next(); } } }