初始化时你称之为超类和子类？ [英] What do you call the superclass and subclass when initializing?

问题描述

List<String> list = new ArrayList<String>();

在识别除超类和子类之外的部分时，List和ArrayList是什么？

What is List and ArrayList when identifying the parts besides super class and subclass?

列表是引用而ArrayList是类吗？

Is List the reference and ArrayList the class?

如果它们是相同的，它们会被调用吗：

Would they be called something else if they were the same like:

ArrayList<String> list = new ArrayList<String>();

推荐答案

此声明分为三部分：

1. 命名参考（列表）


2. 编译时，引用的静态类型（ List< String> ）


3. 运行时，引用的动态类型（ ArrayList< String> ）

1. A named reference (list)
2. The compile time, static type of the reference (List<String>)
3. The run time, dynamic type of the reference (ArrayList<String>)

无论如何，每个部分都将保留其角色你修改了编译时类型。

Each of those pieces would retain their character regardless of how you modified the compile time type.

List 是一个接口; ArrayList 是该接口的实现。

List is an interface; ArrayList is an implementation of that interface.

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