int x = 5;          //an integer (whole number)
  int x = -8976;      // another one
  double y = 234.557  // a real number 

   double x, y;
   x = Double.parseDouble(number1.getText());
   y = Double.parseDouble(number2.getText());
   greeting.setText("Answer: " + (x + y));

How to add two doubles together

Java's primitive types for numbers include the int type (for whole numbers) and the double type for numbers with decimal places (real numbers).

To add two doubles together use the code shown on the left in the actionPerformed method of the AddTwo Class.

Be sure to spell correctly, double and Double are different!
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