Java 如何初始化一个迭代器
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how to init an iterator
提问by mkind
i just intent to initialize an iterator over a generic linked list like that (generic typ T seems to be erased in here since the site interpret it as tag)
我只是打算在这样的通用链表上初始化迭代器（通用 typ T 似乎在这里被删除，因为站点将其解释为标签）
public <T> LinkedList<T> sort(LinkedList<T> list){
Iterator<T> iter = new list.iterator();
...
but i got the error:
但我得到了错误：
"list cannot be resolved"
“列表无法解析”
what's wrong?
怎么了？
采纳答案by Jon Bright
To further clarify Mykola's correct answer: you're trying to create a new object of the class list. So you just want to call list.iterator()(which, somewhere inside it, is itself doing new Iteratoror something like it and returning that to you).
为了进一步澄清 Mykola 的正确答案：您正在尝试创建类的新对象list。所以你只想调用list.iterator()（它在它内部的某个地方，它本身正在做new Iterator或类似的事情并将其返回给你）。
Since you're clearly using Java 5 or above, though, the better way might be instead of doing
但是，由于您显然使用的是 Java 5 或更高版本，因此更好的方法可能是不要这样做
public <T> LinkedList<T> sort(LinkedList<T> list){
Iterator<T> iter = new list.iterator();
while (iter.hasNext()){
T t = iter.next();
...
}
}
instead doing this:
而是这样做：
public <T> LinkedList<T> sort(LinkedList<T> list){
for (T t : list){
...
}
}
Still better, don't write that method at all and instead use
更好的是，根本不要写那个方法，而是使用
Collections.sort(list);
回答by Mykola Golubyev
Remove the newkeyword:
删除new关键字：
Iterator<T> iter = list.iterator();
回答by Niger
The word followed by new operator must be a Class name. Here list.iterator() is already returning a Object. So at this point new is uncessary.
new 运算符后面的单词必须是类名。这里 list.iterator() 已经返回了一个对象。所以在这一点上 new 是不必要的。
