Computer Science Canada :: View topic - While loop repeats even if conditions are met

System.out.println("Enter your payment method (supported: Visa, Mastercard, Paypal, cash");
String payment = input.next();
do
{
System.out.println("Invalid payment method.");
System.out.println("Enter your payment method (supported: Visa, Mastercard, Paypal, cash");
payment = input.next();
} while(!payment.equals("visa")||!payment.equals("Visa")||!payment.equals("mastercard")||!payment.equals("Mastercard")||!payment.equals("paypal")||!payment.equals("Paypal")||!payment.equals("cash")||!payment.equals("Cash"));

Author:	Zren [ Mon Nov 16, 2015 7:31 pm ]
Post subject:	RE:While loop repeats even if conditions are met
Use payment.equalsIgnoreCase("visa") instead of doing 2^(lengthOfString) comparisions to check all possibilities. do {} while(); loops will always run once. It will not check the exit condition until the end of the first iteration.