class Car {

  private String color;

  Car(String newColor) {
    color = newColor;
  }

  void showColor() {
    System.out.println(this.color);
  }
}

Car car1 = new Car("red");
Car car2 = new Car("blue");

car1.showColor(); // this -> car1 -> this.color == car1.color
car2.showColor(); // this -> car2 -> this.color == car2.color