java - Round off a double while maintaining the trailing zero

Java - Round off a double while maintaining the trailing zero

If you want to round off a double in Java while maintaining the trailing zero, you can use the DecimalFormat class to achieve this. Here's an example:

import java.text.DecimalFormat; public class RoundDoubleWithTrailingZero { public static void main(String[] args) { double number = 123.456789; // Specify the desired format with trailing zeros DecimalFormat df = new DecimalFormat("#.000"); // Format the double with the specified format String formattedNumber = df.format(number); System.out.println("Original Number: " + number); System.out.println("Formatted Number: " + formattedNumber); } }

In this example:

  • DecimalFormat("#.000") sets up a DecimalFormat with the pattern #.000, which ensures there are always three digits after the decimal point (trailing zeros if needed).

  • df.format(number) formats the double number using the specified format.

After running this program, the output will be:

Original Number: 123.456789 Formatted Number: 123.457

Adjust the format pattern in DecimalFormat to suit your specific needs. If you want a different number of decimal places, modify the pattern accordingly.

Examples

  1. "Java round double with trailing zero"

    • Code Implementation:
      double originalValue = 123.456; DecimalFormat df = new DecimalFormat("#.0"); String roundedValue = df.format(originalValue);
    • Description: Use DecimalFormat to format the double with one decimal place, ensuring a trailing zero is maintained.

  2. "Java round to 2 decimal places with trailing zero"

    • Code Implementation:
      double originalValue = 456.789; double roundedValue = Math.round(originalValue * 100.0) / 100.0;
    • Description: Multiply by 100, round, and then divide by 100 to round to two decimal places with a trailing zero.

  3. "Java BigDecimal round double with trailing zero"

    • Code Implementation:
      double originalValue = 789.123; BigDecimal roundedValue = new BigDecimal(originalValue).setScale(1, RoundingMode.HALF_UP);
    • Description: Use BigDecimal to round the double with one decimal place and maintain the trailing zero.

  4. "Java format double to string with trailing zero"

    • Code Implementation:
      double originalValue = 234.567; String roundedValue = String.format("%.1f", originalValue);
    • Description: Use String.format to format the double with one decimal place and preserve the trailing zero.

  5. "Java round half up with trailing zero"

    • Code Implementation:
      double originalValue = 567.890; double roundedValue = Math.round(originalValue * 10.0) / 10.0;
    • Description: Multiply by 10, round, and then divide by 10 to round half up with a trailing zero.

  6. "Java DecimalFormat trailing zeros"

    • Code Implementation:
      double originalValue = 890.123; DecimalFormat df = new DecimalFormat("0.0##"); String roundedValue = df.format(originalValue);
    • Description: Customize the DecimalFormat pattern to ensure trailing zeros are maintained.

  7. "Java round double to 3 decimal places with trailing zero"

    • Code Implementation:
      double originalValue = 123.456; double roundedValue = Math.round(originalValue * 1000.0) / 1000.0;
    • Description: Multiply by 1000, round, and then divide by 1000 to round to three decimal places with a trailing zero.

  8. "Java round to nearest tenth with trailing zero"

    • Code Implementation:
      double originalValue = 456.789; double roundedValue = Math.round(originalValue * 10.0) / 10.0;
    • Description: Multiply by 10, round, and then divide by 10 to round to the nearest tenth with a trailing zero.

  9. "Java double to string with fixed decimal places"

    • Code Implementation:
      double originalValue = 789.123; String roundedValue = String.format("%.2f", originalValue);
    • Description: Use String.format to format the double with two decimal places and maintain the trailing zero.

  10. "Java round to nearest integer with trailing zero"

    • Code Implementation:
      double originalValue = 234.567; double roundedValue = Math.round(originalValue);
    • Description: Use Math.round to round to the nearest integer with a trailing zero.

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