Constructor this()

• constructor this()

constructor call other constructor in same class.

it must be in first line of constructor.

class Car {
    String color;
    String gearType;
    int door;
    
    Car() {//default constructor
        color = "white";
        gearType = "auto";
        door = 4;
    }
    Car(String c, String g, int d) {
        color = c;
        gearType = g;
        door = d;
    }
}

Remove duplicated codes :

class Car {
    String color;
    String gearType;
    int door;
    
    Car() {//default constructor
        //Car("white","auto",4);
        this("white","auto",4);
    }
    Car(String c, String g, int d) {
        color = c;
        gearType = g;
        door = d;
    }
}