Java之统计并输出文本文件中元音字母a,e,i,o,u的个数

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {
public static void main(String[] args) {
File file1=new File("E:\\java\\newFile.txt");
try {
FileInputStream fi=new FileInputStream(file1);
int s,aa=0 ;
s=fi.read();
while(s!=-1)
{
char c= (char) s;
if(c=='a')
{
aa++;
}
s=fi.read();
}
System.out.println("newFile.txt中a的个数为:"+aa);
fi.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

}