Declare and uses a static counter variable : 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 static void main(String[] args) {
    new Car();
    new Car();
    new Car();
    System.out.println("Car count is now " + frogCount);
  }
}