Integers with "minutes" as the unit, converted to decimals with "yuan" as the unit (Long -> double -> String)

  Appeal : There is a Long type integer in the project. The meaning is the price in "cents". It needs to be converted into a string with "yuan" as the unit, and the format is "0.00", that is, 2 decimal places are reserved. Without losing accuracy.

  Implementation process : Convert Long to double, then use the DecimalFormat convention format to convert double to String. The code process is shown below.

package com.test;

import java.text.DecimalFormat;

public class Test {
    
    

    public static void main(String[] args) {
    
    

        // 以“分”为单位的价格，即 1.20 元
        Long price = 120L;
        double price1 = price.doubleValue() / 100;
        System.out.println(price1);                           // 1.2

        // 将结果保留为 0.00 格式
        DecimalFormat df = new DecimalFormat("0.00");
        String price2 = df.format(price1);
        System.out.println(price2);                           // 1.20
    }
}