What is the different between pointer "this" and this declaration

Question

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

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

Answer 1

the difference is making the compiler work a little more to find out what object are you referring to

sometimes is a requirement to differentiate a parameter and an attribute with the same name

Vehicle (String color){
this.color = color;
}

the first one is referring to the attribute and the second one to the parameter

is advisable to write it to make it readable