(Interview questions) abstract classes and static properties and static methods (October 17, 2019)

1. abstract methods in an abstract class must do?

  Is constant in the abstract method of the abstract class, an abstract class has 0 ~ N abstract methods

2. The difference between stack and heap

Big heap memory, but slow operation, a smaller space on the stack, but the computing speed

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Origin www.cnblogs.com/Starlets/p/11694079.html