static class is great vernacular
static representation does not belong to an instance, belongs to the class members can be modified, can also be modified method
For example, the definition of man
class Person{
static long totalNum; // total number of human beings, does not belong to a specific example of a person belonging to the class of variable human
}
Scarlet will use the static understanding of the
https://blog.csdn.net/touziss/article/details/81865100
https://www.cnblogs.com/dolphin0520/p/3799052.html