Java 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()); 
        } 
    } 
}