Answer 1

There is no need to use constructor here.

Use only get and set methods.

The set method is used later on in your main method to set the value, example:
v1.setColor("green");

And the get method will return the value when you gonna print it out, example:
System.out.println(v1.getColor());

I got a code you can check how it works:
https://code.sololearn.com/cpAdKz68c2j5/#java