Placing interest on a bank transaction. Varying interests for different accounts not working?

Question

I am trying to place interest on bank transactions. The main goal is to try and have 0.05 or 5% on transactions over 2000. 0.02 or 2% as a flat rate for Savings accounts and 0% for a checking account.

So I have a check interest method that is placed before any deposit so the correct interest is given. I cant get the 0% to work without it overriding the other interests. My code looks like this as a default.

public void checkInterest(double amount){

 if(balance + amount <= 2000){

     interest = 0.02;
   }
    else{
        interest = 0.05; 
    }

My last attempt was this.

 public void checkInterest(double amount){

 if(balance + amount <= 2000){

     interest = 0.02;
   }
    else{
        interest = 0.05; 
    }
  if(Checking.accountType == "checking"){

     interest = 0.00;
 }
}

If I do this, whilst running it overrides and gives out a flat 0%. I also tried using Checking.accountType != null, but this also didn't work.

Any pointers? This is just for academic work. (also, I'm just a beginner so go easy)

Answer 1

If the account type is a String, you should compare them like this:

if(Checking.accountType.equals("checking")){

Also, you might want to change your checkInterest method to return the value of interest.

 public double checkInterest(double amount){
   double interest;
   // Calculate interest rate here
   return interest;
 }