分析两个字符串，分别输出每个字符串的单词并统计出单词个数。阅读程序，填写空行。

注意：不改动程序结构，不得增行或删行。

import java.util.*;

public class ex2

{

public static void main(String args[])

{

String s1="I am Chinese,she is my girlfriend";

String s2="Oh,really,fine";

StringTokenizer fenxi_1=new StringTokenizer(s1,",");

StringTokenizer fenxi_2=new StringTokenizer(s2,",");

int n1=fenxi_1.countTokens();

int n2=fenxi_2.countTokens();

while(fenxi_1.hasMoreTokens())

{

String s=fenxi_1.nextToken();

System.out.println(s);

}

System.out.println("s1单词："+n1+"个");

while(fenxi_1.hasMoreTokens())

{

String s=______;

System.out.println(s);

}

System.out.println("s2单词："+n2+"个");

}

}