JAVA:嵌套在公共(public)类的迭代器中

Question

因此，对于一个学校项目，我需要创建一个实现 Iterator 接口(interface)的私有(private)方法。我有我的方法 SetIterator，它看起来像这样:

  private class SetIterator implements Iterator<T> {
  private T[] items; 
  private int count; 
  private int current; 

  private SetIterator(T[] elements, int size) {
     items = elements;
     count = size;
     current = 0;
  }

  private boolean hasNext() {
     return (current < count);
  }

  private T next() {
     if (!hasNext()) {
        throw new NoSuchElementException();
     }

     return items[current++];
  }

但是，我无法编译，因为收到此错误消息:

ArraySet.java:311: error: next() in ArraySet.SetIterator cannot implement next() in Iterator
  private T next() {
            ^
attempting to assign weaker access privileges; was public
where T,E are type-variables:
T extends Comparable<? super T> declared in class ArraySet
E extends Object declared in interface Iterator
ArraySet.java:307: error: hasNext() in ArraySet.SetIterator cannot implement hasNext() in Iterator
private boolean hasNext() {
                  ^
attempting to assign weaker access privileges; was public

我以前从未真正遇到过这个问题，所以任何帮助将不胜感激。

Answer 1

迭代器是一个接口(interface)。因此，它的方法是公开的。您无法实现该方法并将其设置为私有(private)。

将可见性更改为公开。

public boolean hasNext() {
  return (current < count);
}