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How to format number as percentage string?

The NumberFormat.getPercentInstance() method returns a percentage format for the specified locale. In this example we will format the number as percentage using the Arabic locale.

package com.javacoderanch.example.text;

import java.text.NumberFormat;
import java.util.Locale;

public class LocalePercentageFormat {
    public static void main(String[] args) {
        // Create a Locale object for Arabic
        Locale locale = new Locale("ar");

        // Format percentage for Arabic locale with this formatter,
        // a decimal fraction such as 0.75 is displayed as 75%
        double number = 0.25;
        NumberFormat format = NumberFormat.getPercentInstance(locale);
        String percentage = format.format(number);
        System.out.println(number + " in percentage = " + percentage);

The following line is the output of the program:

0.25 in percentage = 25%