CODEWITHSUNDEEP
java
user914357
user914357

Reputation: 15

Java Decimals formatting

How to number formating with Java in various scenarios:

  1. if the value is 0,then output will be zero.
  2. if the value 1,then output will be 1.
  3. if the value is 1.2,then output will be 1.20.
  4. if the value is 1.20,then output will be 1.20.

So it means if the input value has decimals then i have to apply numberformat to two decimal places otherwise not required.

Upvotes: 1

Views: 328

Answers (2)

Gilbert Le Blanc
Gilbert Le Blanc

Reputation: 51445

One DecimalFormatter isn't going to work for the case of no decimal and the case of two decimal places.

Here's some code that meets all 4 of your conditions:

    DecimalFormat formatter1 = new DecimalFormat("0");
    DecimalFormat formatter2 = new DecimalFormat("0.00");

    double[] input = {0, 1, 1.2, 1.265};
    for (int i = 0; i < input.length; i++) {
        double test = Math.round(input[i]);
        if (Math.abs(test - input[i]) < 1E-6) {
            System.out.println(formatter1.format(input[i]));
        } else {
            System.out.println(formatter2.format(input[i]));
        }
    }

Edited to add: For jambjo, a version that manipulates the String after the DecimalFormatter.

    DecimalFormat formatter2 = new DecimalFormat("0.00");

    double[] input = {0, 1, 1.2, 1.265};
    for (int i = 0; i < input.length; i++) {
        String result = formatter2.format(input[i]);
        int pos = result.indexOf(".00");
        if (pos >= 0) {
            result = result.substring(0, pos);
        }
        System.out.println(result);
    }

Upvotes: 3

david a.
david a.

Reputation: 5291

See http://docs.oracle.com/javase/6/docs/api/java/text/DecimalFormat.html . An example of such format would be:

double input = 1.2;
DecimalFormat formatter = new DecimalFormat("0.00");
String result = formatter.format(input);

Decimal symbol (as well as other symbols used in the result string) will be dependent on system locale (unless set otherwise) - see http://docs.oracle.com/javase/6/docs/api/java/text/DecimalFormat.html#setDecimalFormatSymbols%28java.text.DecimalFormatSymbols

Upvotes: -2

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