// generate prime numbers on 'Generate Prime Numbers' Button click @FXML private void generatePrimeNumbers() { bitsValue = valueBitsPrimary.getText(); // get a bits value entered by the user // firstPrime = firstPrimary.getText(); // secondPrime = secondPrimary.getText(); if (bitsValue.trim().equals("")) { makeAlert( "You have not selected a bits value!!", "Please select a bits value to generate prime number."); return; // if the bits value are not entered in the field, break the function and do not // proceed further } rsa.generatePrimes(bitsValue); // get first prime number firstPrimary.setText(rsa.getFirstPrime()); // get second prime number secondPrimary.setText(rsa.getSecondPrime()); }