Operating With Big Decimal Values

 // Create via a string.
 BigDecimal bd1 = new BigDecimal(
   "123456789.0123456890");
     
 // Create via a long.
 BigDecimal bd2 = BigDecimal.valueOf(123);
  
 bd1 = bd1.add(bd2);
 bd1 = bd1.multiply(bd2);
 bd1 = bd1.subtract(bd2);
 bd1 = bd1.divide(bd2, BigDecimal.ROUND_UP);
 bd1 = bd1.negate();