Java Decimal class and rounding method with very high precision decimal time

Note If the result is an infinite number of decimal places, you will get an error if you do not specify a digit rounding

Import Java.util.scanner;import Java.math.bigdecimal;public class Main {public static void main (String args[]) {Scanner in = new Scanner (system.in); BigDecimal a = In.nextbigdecimal (); BigDecimal B = in.nextbigdecimal (); System.out.println ("Add" + a.add (b)); System.out.println ("Sub" + a.subtract (b)); System.out.println ("Mul" + a.multiply (b)); System.out.println ("Divide" + a.divide (b));//here If the result is an infinite loop, you will get an error System.out.println ("Rounding:" + a.divide (b,5, BIGDECIMAL.ROUND_HALF_UP));//The second parameter is the number of decimal digits  a.divide (b,5,bigdecimal.round_half_up). doublevalue;double D1 = 3.1415926; BigDecimal T1 = new BigDecimal (D1); You can convert the Doubletobigdecimal int d2 = 3214856 in turn; BigDecimal t2 = new BigDecimal (D2); BigDecimal t3 = new BigDecimal ("843269136"); System.out.println ("Dobule to:" + T1); System.out.println ("Int to:" + T2); System.out.println ("String to:" + T3);}}

Java Decimal class and rounding method with very high precision decimal time