Use the dot operator on the class name, as opposed to using it on a reference to an instance : static « Modifiers « SCJP

1. SCJP
2. Modifiers
3. static

class Car {
   static int frogCount = 0;  // Declare and initialize static variable
   public Car() {
      frogCount += 1;  // Modify the value in the constructor
   }
}

public class MainClass {
   public static void main (String [] args) {
     new Car();
     new Car();
     new Car();
     System.out.print("frogCount:"+Car.frogCount); //Access static variable
   }
}

frogCount:3