How can I format a double value in Java to display a specific number of decimal places?

Formatting Decimals in Double Values with NumberFormat

Formatting decimal places in double values can be a common task in Java programming. Suppose we have a double variable, such as 4.0, and we want to format its decimal places to display 4.00 instead. Here's a solution using the NumberFormat class:

import java.text.DecimalFormat;

class DecimalFormatting {
    public static void main(String[] args) {
        double value = 4.0;

        // Initialize a DecimalFormat object
        NumberFormat formatter = new DecimalFormat("#0.00");

        // Format the double value
        String formattedValue = formatter.format(value);

        // Print the formatted value
        System.out.println(formattedValue);
    }
}

This code achieves the desired formatting by:

• Importing the DecimalFormat class: It belongs to the java.text package and provides methods for formatting numbers.
• Creating a DecimalFormat object: We specify the "#0.00" pattern, where "#" represents digits, "0" represents zeros to fill in missing digits, and "." represents the decimal separator.
• Formatting the double value: Using the format method of DecimalFormat, we convert the double value into a formatted string.
• Printing the formatted string: Finally, the formatted value is printed, which will display 4.00.

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