Question

java程序，将十进制的数转化成以逗号为分隔的字符串。例如1234567变成1,234,567

Answer 1

import java.text.*;
import java.io.*;
public class T2 {
public static void main(String[] args) throws Exception {
int a=1234567;
DecimalFormat df=new DecimalFormat(",###");
System.out.println(df.format(a));
}
}
用java的格式化功能就可以了.

Answer 2

//手写代码，其中的逻辑自己领悟吧- -！
int num = 1234567890;
String getNum = "";
while(num/1000 > 0){
String a = "," + num%1000;
num = num /1000;
getNum = a + getNum;
}
getNum = num+getNum;
System.out.print(num + "=" + getNum);