Bigdecimal userinput or double to Bigdecimal-CodePudding

I am creating a Currency converter using BigDecimal and now I am suck with an issue.

I have a user-defined number - "Amount" (this is the amount of currency you want to convert)

I am putting that userValue through the scanner class but I have only ever done this successfully with the following :

int userInput = new scanner.nextint();

I would have loved userinput to be passed as a BigDecimal

but my understanding of java is very limited.

would you suggest converting the double to BigDecimal or is there a much simple way.

CodePudding user response：

If you would like to get user input as a BigDecimal then you can use one of Scanner class method nextBigDecimal() To convert existing double to BigDecimal you can use BigDecimal.valueOf() method.

Code sample:


    public static void main(String[] args) {
        var scanner = new Scanner(System.in);
        System.out.println("Enter BigDecimal");
        var number = scanner.nextBigDecimal();
        System.out.println("BigDecimal from user input: "   number);

        var doubleNumber = 2.15;
        var decimal = BigDecimal.valueOf(doubleNumber);
        System.out.println("Double converted to BigDecimal: "   decimal);
    }

Listing:

Enter BigDecimal
2,15
BigDecimal from user input: 2.15
Double converted to BigDecimal: 2.15

Process finished with exit code 0

Keep in mind that while converting double to BigDecimal you may loose some accuracy of data, because double is less accurate comparing to BigDecimal.

CodePudding user response：

You can use nextBigInteger:

Scanner sc = new Scanner(System.in);
BigInteger userInput = sc.nextBigInteger();