Java中泛型数组的解决方法 [英] Workaround for generic arrays in java

问题描述

我有一个任务，我需要创建自己的（简单）通用链表：

  public class Node< T> ; {
 
 private int key; 
私人T数据; 
私人节点< T> nextNode; 
 
} 
  

但是我需要用哈希表实现一个字典。我想制作一个包含节点的列表。如果发生冲突（两个类型的对象分散到同一个节点，我只需链接它们 - 链表）。

我必须自己实现这个，没有外部帮助（已经实施的清单或以往）

我是如何做到这一点的：

  public class GenericDictionary< T>实现GenericDictionary_interface< T> {
 
 private int capacity; 
私人节点< T> []插槽; 
 
 public GenericDictionary（）{
 this.capacity = 31; 
 slots =新节点< T> [容量]; //我需要分散到
} 
} 
  

的数组然而并不完全可能。我尝试了解这个主题，试着在这里搜索......但是我没有得到它。

我唯一的要求是...不要对变量/方法的名字不要太在意，让它们易于理解。 解决方案

以下是你可以做的最好的：

  @SuppressWarnings（unchecked）
节点< T> [] slots =（Node< T> []）新节点<> [容量]; 
  

你不能摆脱警告（除了压制它）。当你需要一个泛型类的数组时，你需要创建一个未指定泛型类型的数组，然后进行转换。

I have an assignment and I need to make my own (simple) generic linked list:

public class Node<T> {

   private int key;
   private T data;
   private Node<T> nextNode;

}

But I need to implement a dictionary with a hash table. I wanted to make a list containing Node(s). In case of a conflict (two objects of type disperse to the same node, I simply link them - linked lists).

I have to implement this by myself, no outside help (already implemented lists or what ever)

How I wanted to do this:

public class GenericDictionary<T> implements GenericDictionary_interface<T> {

    private int capacity;   
    private Node<T> [] slots;

    public GenericDictionary () {   
        this.capacity = 31;
        slots = new Node<T>[capacity];  // the array I need which I disperse to
    }
}

This however is not exactly possible. I did try and read on the subject, tried searching here on SO ... but I didn't get it at all.

My only request is ... don't be lazy on variable / method names, make them easy to understand please.

解决方案

Here's the best you can do:

    @SuppressWarnings("unchecked")
    Node<T>[] slots = (Node<T>[]) new Node<?>[capacity];

You can't get rid of the warning (aside from suppressing it). When you need an array of a generic class, you need to create the array with unspecified generic type then cast it.

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