迭代器模式

interface Iterator {
    public boolean hasNext();
    public Object next();
}

class NameIterator implements Iterator {
    private int index;
    private String array[];

    public NameIterator(String[] array) {
        this.array = array;
    }

    public boolean hasNext() {
        if (index < array.length) { //length是个成员变量，不加()
            return true;
        } else {
            return false;
        }
    }

    public Object next() {
        if(hasNext()) {
            return array[index++];
        } else {
            return null;
        }
    }
}


interface Container {
    public Iterator getIterator();
}


class NamePropersity implements Container {
    private String array[];

    public NamePropersity(String array[]) { //通过构造函数将Propersity和Iterator关联起来
        this.array = array;
    }

    public Iterator getIterator() {
        return new NameIterator(array);
    }
}


public class IteratorPatternDemo {
    public static void main(String args[]) {
        String names[] = {"AA", "BB", "CC", "DD", "EE", "FF", "GG", "HH"};
        Container container = new NamePropersity(names);

        /*面向对象编程就不只是从参数传参了，可以直接是某个对象进行调用*/
        for (Iterator iterator = container.getIterator(); iterator.hasNext();) {
            System.out.println("name: " + iterator.next());
        }
    }
}