in this tutorial will help you to learn Payroll Loan Calculation using Java. how to change the currency format all the thing taught in this tutorial.
NumberFormat curr = NumberFormat.getCurrencyInstance();
this class which used to formatting numbers easy way.
Paste this code inside the Calculation Button
double amt; int month; NumberFormat curr = NumberFormat.getCurrencyInstance(); double interset; amt = Double.parseDouble(txtAmount.getText()); month = Integer.parseInt(txtMonth.getText()); interset = Double.parseDouble(txtInt.getText()); double monthlyPayment = amt * interset/month; double fullpayment = monthlyPayment * month; txtamt.setText(curr.format(amt)); txtMamt.setText(curr.format(monthlyPayment)); txtTot.setText(curr.format(fullpayment));