The observed behavior is result of a side-effect. That is, you expected moneyaddition
to return the result of money+added
and wonder why the function returned just the added
value instead of the sum. There’s nothing wrong with the function your looking at, but in the prior call to walletbalance
you’ve never set the money
member, so 0 + added
makes added
. You need to fix the setter for this property, then it works:
public static double walletbalance(double bal) {
money = bal;
return bal;
}