java - 列表迭代器不工作

Question

我不断收到错误:Salama 类型的方法 listIterator() 未定义。

是因为Salama不是LinkedList吗？

这是 main 中的代码:

private Salama asteroids = new Salama();
private Salama rockets = new Salama(); 
private Station station = new Station (FrameWidth/2, FrameHeight-20); 

public void paint (Graphics g) { 
    station.paint(g); 

    ListIterator <Faeton> aIt = asteroids.listIterator();
    while (aIt.hasNext()) {
        Faeton asteroid = (Faeton) aIt.next();
        asteroid.paint(g); 

这是类里面的内容:

class Salama {     
    private Object data;  
    private Salama next;     
    private Salama head;

    Salama (){
        head = new Salama();
        head.setNext(null);
       }

    public void setNext(Salama e) {
    public Salama getNext()
    public void setData(Object d)

    public void add (Object o){
        Salama temp = new Salama();
        temp.setData(o);
        Salama current = head;
        while (current.getNext() != null){
            current = current.getNext();
        }
        current.setNext(temp);
    }
}

Answer 1

您的 Salama 类需要一个 listIterator 方法(如果您想使用列表迭代器)。根据您的使用情况，签名应如下所示

public ListIterator<Faeton> listIterator() {
    // Create a list iterator and return here.
}

可能值得阅读标准 ListIterator 文档:http://docs.oracle.com/javase/7/docs/api/java/util/ListIterator.html