java - Map map = new HashMap<>这个是c++里面的运行期绑定？

Question

我个人理解，接口本质上是抽象类，依此理解的话，HashMap就是Map的子类对不对？
所以以上语句会出现运行期绑定？还是我哪里理解错了？
java子类可以重载父类的方法，而不overload那个方法？

Answer 1

1. In Java, the constructor of Map map = new HashMap() 是在编译期就通过类型推断绑定了, 可以看到这里已经显式的调用了 HashMap

2. Overload is Overload, and "subclasses can override methods of parent classes" refers to Override, which is called rewriting or overwriting https://en.wikipedia.org/wiki...

Answer 2

The nature of Java is to perform type inference at compile time, not at runtime.