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Thread: Decimal Places

  1. #1
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    Default Decimal Places

    Hi and thanks for looking,

    I am using the IDE Netbeans

    I am trying to get the answer to show to two decimal points and have tried various ways but none which work for me.
    Here's the code.
        private void btnEqualsActionPerformed(java.awt.event.ActionEvent evt) {                                          
        Double numAnswer; String strAnswer;
         numAnswer = (Double.parseDouble(txtNumOne.getText()))* (Double.parseDouble(txtNumTwo.getText()));
         strAnswer = Double.toString(numAnswer);
         lblAnswer.setText(strAnswer);
        }
    Last edited by Mallard; March 16th, 2020 at 02:15 PM.

  2. #2
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    Default Re: Decimal Places

    You can do a few things for a Double d = 5.09876:

    1. Use String.format

    String formatted = String.format("%.2f", d);
    System.out.println(formatted);

    2. Use DecimalFormat

    DecimalFormat df = new DecimalFormat("#.##");
    System.out.println(df.format(d));

    The problem with both of these methods is that is will round up.

    The output of the first solution is 5.10
    The output of the second solution is 5.1

    The better solution is:

    3. Use DecimalFormat with RoundingMode.FLOOR

    DecimalFormat df = new DecimalFormat("#.##");
    df.setRoundingMode(RoundingMode.FLOOR);
    System.out.println(df.format(d));

    The output of this is 5.09

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