Create a functional calculator that uses JButtons for numbers from 0-9, the . for decimals, and for operators +, -, * ,/ and = as well as a JTextfield that displays the current value or the result. Use ActionListeners and LayoutManagers appropriately. The calculator should also have a button to clear the current value. Keep in mind that the getText() method of a GUI component such as JTextfield returns a string, so you need to cast it as an int or float in order to perform mathematical operations on the numbers the user enters.

The example below shows how to determine which button has been clicked:

ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent actionEvent) { System.out.println(actionEvent.getActionCommand()); } };