java - 当场初始化一个类时，它叫什么？

Question

这个问题已经有答案了:

Can we create an object of an interface? (6 个回答)

已关闭 5 年前。

像这样:

Kernel kernel = new Kernel() {};

我不知道它的名字。我想知道这叫什么，这样我就可以了解更多信息，但不幸的是我自己无法通过搜索引擎找到答案。

Answer 1

它被称为匿名类。摘自Oracle tutorial :

The anonymous class expression consists of the following:

• The new operator

• The name of an interface to implement or a class to extend. In this example, the anonymous class is implementing the interface HelloWorld.

• Parentheses that contain the arguments to a constructor, just like a normal class instance creation expression. Note: When you implement an interface, there is no constructor, so you use an empty pair of parentheses, as in this example.

• A body, which is a class declaration body. More specifically, in the body, method declarations are allowed but statements are not.