JAVA设计模式（行为型）------ 迭代器模式

提供一种方法顺序访问一个聚合对象中各个元素, 而又无须暴露该对象的内部表示。
实现Iterator接口

public class Iterator_Main {

    public static void main(String[] args) {
        List<Integer> integerList = new ArrayList(){{add(1);add(2);}};
        MyArr<Integer> arr = new MyArr<>(integerList);
        Iterator<Integer> iter = arr.getIter();
        while (true) {
            if (iter.hasNext()) {
                System.out.println(iter.next());
            } else {
                break;
            }
        }
    }
}

class MyArr<T> {
    private T[] arrs;
    MyArr(T[] t) {
        this.arrs = t;
    }
    MyArr(List<T> list) {
        if (!CollectionUtils.isEmpty(list))
            arrs = (T[]) list.toArray();
    }
    public Iterator<T> getIter() {return new Iter(); }
    private class Iter implements Iterator<T> {
        int cursor;
        @Override
        public boolean hasNext() {return cursor <= arrs.length - 1;}
        @Override
        public T next() {
            T arr = arrs[cursor];
            cursor++;
            return arr;
        }
    }
}