static in class level

Question

Can anyone say about static un class level

Answer 1

In Java, if something is static at the class level then it is a class variable. Unlike instance variables, which require instantiation to access the variable, class variables are accessed through the class itself.

Person p = new Person();
p.age = 25; // <- age is instance variable

Person.num_people++; //<- num_people is class variable

p.num_people++; //<- CANNOT DO THIS

Class variables are static, this there is only one reference across all instances.