Question: A GUI for a simple calculator keeps a running total of numbers - The user enters a number in the text field, and then

A GUI for a simple calculator keeps a running total of numbers - The user enters a number in the text field, and then clicks either + or - The number in the text field is then added to or subtracted from the running total, and displayed in the text field This value is kept in the instance variable result When the GUI is first run, or when the user clicks the Reset button, the value of result is set to zero If the user enters a number in an incorrect format, then one of the methods throws a NumberFormatException The exception is caught in the catch block inside the action Performed method Note that when this exception is thrown, the value of the instance variable result is not changed Display 17.19 A Simple Calculator RESULTING GUI (When started) Simplified Calculator Enter numbers here + Reset RESULTING GUI (After entering 2,000) Simplified Calculator 2,000 + Reset (continued)

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