Java BigDecimal: Set Scale and Round with ROUND_HALF_UP

This code sets the scale of a BigDecimal number to 2 decimal places and rounds it using the 'ROUND_HALF_UP' rounding mode. The resulting value is then converted to a double primitive type.

For example, if we have a BigDecimal number of 3.14159 and we apply this code, the resulting value would be 3.14.

The 'ROUND_HALF_UP' rounding mode rounds the number to the nearest neighbor, rounding up if the next digit is greater than or equal to 5.