LinkedList、队列与列表的区别 [英] Difference in LinkedList, queue vs list
问题描述
创建这两个对象有什么区别
What is the difference when creating these two objects
Queue<String> test = new LinkedList<String>();
和
List<String> test2 = new LinkedList<String>();
test 和 test2 之间的实际区别是什么?他们都是 LinkedList 吗?是否存在性能差异或使用其中一种的原因?
What are the actual differences between test and test2? Are both of them LinkedList ? Are there performance differences or reasons to use one over the other?
推荐答案
您编写的两个语句分别构造了一个 LinkedList 对象来保存字符串列表，然后将其分配给一个变量.区别在于变量的类型.
The two statements you've written each construct a LinkedList<String> object to hold a list of strings, then assign it to a variable. The difference is in the type of the variable.
通过将LinkedList赋值给Queue类型的变量，你只能访问LinkedList中的方法在 Queue 接口中可用，其中包括对入队和出队元素的支持.如果您需要编写使用队列进行各种操作的程序，并希望使用链表实现该队列，这将非常有用.
By assigning the LinkedList<String> to a variable of type Queue<String>, you can only access the methods in the LinkedList that are available in the Queue<String> interface, which includes support for enqueuing and dequeuing elements. This would be useful if you needed to write a program that used a queue for various operations and wanted to implement that queue by using a linked list.
通过将LinkedList赋值给List类型的变量，你只能访问LinkedList中的方法在 List 接口中可用，这是维护元素序列的正常操作.这将很有用，例如，如果您需要处理可以随处增长和缩小的元素列表.
By assigning the LinkedList<String> to a variable of type List<String>, you can only access the methods in the LinkedList that are available in the List<String> interface, which are normal operations for maintaining a sequence of elements. This would be useful, for example, if you needed to process a list of elements that could grow and shrink anywhere.
简而言之，这两行创建了相同的对象，但打算以不同的方式使用它们.一个说它需要一个由链表支持的队列，而另一个说它需要一个由链表支持的一般元素序列.
In short, the two lines create the same object but intend to use them in different ways. One says that it needs a queue backed by a linked list, while the other says that it needs a general sequence of elements backed by a linked list.
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