java读取一个文件下字符串的个数

一行字符串之间使用空格隔开，求第二列字符串的个数

例如：李四 lisi 15

           王五 wangwu 14

         张三 zhangsan 13

输出:3

import java.io.BufferedReader;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class Test {
public static void main(String[] args) {
File f = new File("d:/test.txt");
System.out.println(count(f)); 
}
public static int count(File f){
Map<String, Integer> map = new HashMap<>();
try {
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String line = null;
try {
while((line=br.readLine()) != null){
String[] sArr = line.split(" ");
if(map.containsKey(sArr[1])){
int val = map.get(sArr[1]);
map.put(sArr[1], val+1);
}else{
map.put(sArr[1], 1);
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return map.size();
}
}