How to remove redundancy in code when alternating between methods?
Rethink your function

Instead of using if statements you can store the points in an array and then the current player variable could be an index for the array (so not a string value, use and integer instead). 

Try to think in numbers instead of strings.

Code example:

int[2] pointsArray;
int currentPlayer = 0;
pointsArray[currentPlayer] = roolDiceFunction();


If you really want to use strings though you could use a map but I think it will just make your code more complicated.

Coin:

Just do the coin check at the start of your function by setting the start index for current player. For example if you want the user to start if the coin lands on heads which you can represent as 0, you then just set the current player index to a random value between 0 &amp; 1.

Example:

int[2] pointsArray;
int currentPlayer = (int)Math.random(); //Random value between 0 &amp; 1
pointsArray[currentPlayer] = roolDiceFunction();


I'm guessing there's more to your function than this, but you probably want to have it in a loop of some kind and then ask at the end of the function if the user wants to keep rolling, if they don't want to keep rolling you can change the current player index.

More about your functions

Make the rool2Dice function simpler, does it really need that many parameters, you are passing the exact same most of the time.

If you have any more questions just ask away, good luck.