【Java】給整數加上千分位分隔符

package com.testEmp;

import java.text.DecimalFormat;

public class NumberFormat {
    public static void main(String[] args) {
        System.out.println(toWestNumFormat(1));
        System.out.println(toWestNumFormat(123));
        System.out.println(toWestNumFormat(145676));
        System.out.println(toWestNumFormat(1324323213));
        System.out.println(toWestNumFormat(1321333334567432432L));
    }
    
    /**
       *    將整數在千分位以逗號分隔
     * @param number
     * @return
     */
    public static String toWestNumFormat(long number) {
        DecimalFormat df = new DecimalFormat("#,###");
        return df.format(number);
    }
}

輸出：

1
123
145,676
1,324,323,213
1,321,333,334,567,432,432

--END-- 2019年10月4日21:30:54