I need users to be able to input numbers in the BigDecimal data type.
Numbers[i] = (BigDecimal)JOptionPane.showInputDialog(frame,"Type in a Number",0);
This is the code I tried to use but I get an error saying "Cannot cast from String to BigDecimal."
Any Advice?
You should read docs first. https://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html
BigDecimal has a constructor which takes a string as a representation of your decimal.
Number num = new BigDecimal(JOptionPane.showInputDialog(frame,"Type in a Number",0));