对于具有通用数组的循环？ [英] For loop with a generic array?

问题描述

在这里回顾我的基本ADT知识，然后尝试通过学习Java来用一块石头杀死两只鸟。我正在尝试编写一种用于通用排序列表的归并排序的简单算法（这是我自己创建的）。事实证明，这比我最初想象的要困难得多！有人可以帮我吗？我将开始研究基础知识，并在以后继续学习。

Going back over my basic ADT stuff here, and trying to kill two birds with one stone by learning Java while I amTrying to write a simple algorithm for a merge sort with a generic linked list ( which I am creating myself). It's proving to be far more difficult than I had first imagined ! Can anyone help me out please ? I will start out working on the basics and will update this post as I get further in.

我的通用链接列表代码如下：

My code for the generic linked list is as follows :

    public class NodeList<T> {
  private Comparable head;
  private NodeList tail;
  public NodeList( Comparable item, NodeList list ) {
    head = item;
    tail = list;
  }

}

我正在尝试访问此类

public class MyList<T> {

  private NodeList<T> nodes;
  private int size;
  public MyList( ) { 
    nodes = null; 
  }

  public MyList(T[] array ){
    for(int countArray = 0; countArray <= array.length() ; countArray++) {
      nodes= new NodeList( value, nodes );
      size++;
    }
  }

应使用数组从数组中添加通用项链表。不幸的是，这不是我遇到的第一个问题。我收到错误消息：

which should add generic items from an array, using a linked list. Unfortunately, it doesn't and this is the first problem I have encountered. I am getting the error :

找不到符号：方法length（）。

cannot find symbol : method length().

有人可以给我一些如何解决此问题的建议吗？

Can someone give me some advice on how I could fix this?

非常感谢！

推荐答案

在数组上没有length（）方法，但是有一个length成员：array.length

on the array you don't have a length() method but a length member : array.length

另外，您将要在countArray到达array.length和初始化大小之前停止迭代，然后再使用它：

Additionally, you'll want to stop iterating before countArray reaches array.length and initialise size before using it:

final int arrayLength = array.length;
size = arrayLength;
nodes = null;
for(int i = 0; i < arrayLength; ++i) {
      nodes = new NodeList(array[i], nodes);
}

或

nodes = null;
size = array.length;
for(T element : array) {
      nodes = new NodeList(element, nodes);
}

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