Data types in java : program

We assume car as an object and it has various characteristics defined in variables. There are different methods that  show how objects are defined and different methods can be called.
Code :
package car;
public class Car {
    int maxSpeed = 100;
    int minSpeed = 0;
    double weight = 4079;
    // float is little smaller than double i.e it takes less space in bits
    boolean isTheCarOn = false;
    char condition = 'A';
    String nameOfCar = "haha";
   
    public void wreckCar(){
        condition = 'C';
    }
    public void printVariables(){
        System.out.println("This is the max speed\t"+maxSpeed);
        System.out.println("This is the min speed\t"+minSpeed);
        System.out.println("This is the\t"+weight);
        System.out.println(isTheCarOn);
        System.out.println(condition);
        System.out.println(nameOfCar);
       
    }
    public void upgradeMinSpeed(){
        minSpeed = maxSpeed;
        maxSpeed = maxSpeed + 1;
    }
    public static void main(String[] args) {
        // TODO code application logic here
        Car familyCar = new Car();
        System.out.println("family's car");
        familyCar.printVariables();
        Car aliceCar = familyCar;
        familyCar.wreckCar();
        System.out.println("Alice's car");
        aliceCar.printVariables();
        familyCar.upgradeMinSpeed();
        familyCar.printVariables();
    }
}