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public class LoginCommand implements Command{ private static final String CC = "123456789012"; private static final String PIN ="1234"; @Override public void execute() throws InterruptedOperationException { while(true) { ConsoleHelper.writeMessage("Enter 12-digit credit card number and a 4-digit PIN code"); String ccNumber = ConsoleHelper.readString(); String pinNumber = ConsoleHelper.readString(); if (ccNumber.equals(CC) && pinNumber.equals(PIN)) { ConsoleHelper.writeMessage("VERIFICATION SUCCESSFUL."); } else { ConsoleHelper.writeMessage("INVALID DATA"); continue; } break; } } }