NumberFormat currency = NumberFormat.getCurrencyInstance(); String result = currency.format(some_val); System.out.println(result);double value = 4.2352989244d; String.format("%.2f", value) //output "4.24"); String.format("%.3f", value)//output("4.235");i will refer this site just read it and you will understand everything i hope this help:https://zetcode.com/java/numberformat/ double r = 5.1234; System.out.println(r); // r is 5.1234 int decimalPlaces = 2; BigDecimal bd = new BigDecimal(r); // setScale is immutable bd = bd.setScale(decimalPlaces, BigDecimal.ROUND_HALF_UP); r = bd.doubleValue(); System.out.println(r); // r is 5.12 Number Formatting