Question

If I set a value of an attribute of a class and use final, do i have to initialise the attribute as a parameter of the class constructor? For example, I have set the attribute rack of length to a value of 60

public class Runs {
    Teams team;
    final int racklength=60;
    int xposteam;

     public Runs (Teams y) {
         team=y;           
     }
}

Answer 1

You must always initialize a final attribute, but you can do it either in-place (where you first declare it) or in its constructor (or constructors):

public class Runs {
    Teams team;
    final int racklength; // initialization postponed
    int xposteam;

     // constructor defaulting racklength to 60
     public Runs (Teams y){
         team=y;
         racklength=60;
    }

     // constructor with variable initialization of final attribute
     public Runs (int l, Teams y){
         team=y;
         racklength=l;
    }

     // error since racklength is not initialized during construction
     public Runs (){
         team=null
    }
}