数字千分位分割

package com.example.demo.test;

public class souths {

static Strings="";

public static void main(String[] args) {

String str="123213123.416546";

String 整数="";

String 小数="";

if(str.contains(".")){

String[] s = str.split("\\.");

整数=s[0];

小数="."+s[1];

}else {

整数=str;

}

int le=整数.length()%3;

String stater="";

if(le!=0){

stater = 整数.substring(0,le)+",";

}

String substring = 整数.substring(le);

String jie =jie(substring);

if(jie.equals("")){

stater = stater.substring(0,stater.length() -1);

}else {

jie = jie.substring(0,jie.length() -1);

}

System.out.println(stater+jie+小数);

}

public static String jie(String str){

if(str.length()<3){

return str;

}

String substring = str.substring(0,3);

String shen=str.substring(3);

s+=substring+",";

if(shen.length()<3){

return s;

}else {

jie(shen);

}

return s;

}

}