The constructor is an unusual type of method because it has no return value. This is distinctly different from a void return value, in which the method returns nothing but you still have option to make it return something else. Constructors return nothing and you don’t have an option (the new expression does return a reference to the newly created object, but the constructor itself has no return value).
构造器是一种特殊的Method，因为它没有返回值，这个跟void空返回值有很大的区别。因为即使void method本身不会返回什么，你依旧可以让它返回一些东西。构造器不会返回任何东西，你也没有任何选择让它返回什么东西。