Another classic use of static is to keep count of how many objects are created from a given class. Since Memory is allocated only once for a static variable, If you create any number of objects ,then all objects will have only one common static variable. In this way we can count the number of objects created by incrementing the static variable inside that class

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Class Test{  static void change(){       st_var = "CHANGED";   }   }  and call Like this     Test.change(); // no need of object creation Restrictions for static method There are two main restrictions for the static method. They are: The static method can not use non static data member or call non-static method directly. this and super cannot be used in static context. For Example 1 2 3 4 5 6 7 class A{   int num=50;//non static        public static void main(String args[]){    System.out.println(num);   }  }  The output of above program will be a Compile Time Error.