Constructor questions

Question

https://code.sololearn.com/cj38ilikf5xd/?ref=app

1
This constuctor is also a setter too?

Vehicle() {
this.setColor("Red");
}

2

How does it know that the color attribute have to change when i create a new object?(if i have more attribute in the Vehicle class)
Vehicle v2 = new Vehicle("Green");

Answer 1

thank you!

Answer 2

thank you!

But if i have more attributes:
Vehicle() {
color = "red";
}
Vehicle() {
color2 = "blue";
}
Vehicle(String color){
this.color = color;

Vehicle(String color2){
this.color2 = color2;

}

Vehicle v2 = new Vehicle("Green");

Answer 3

thank you!

But I have : Vehicle v2 = new Vehicle("Green");

Which will be alter color or color2?