迴文palindrome判斷

import java.io.*;
public class around
{
public static void main(String args[]) throws IOException
{
String bi1;
FileReader inputjerry=new FileReader("940301.SM");
//BufferedReader buf =new BufferedReader(inputjerry);
BufferedReader binputjerry=new BufferedReader(inputjerry);

String s1=binputjerry.readLine();
String s2="";
for (int i=s1.length();i>0;i--){
char ch =s1.charAt(i-1);
s2=s2+ch;
}
if (s1.equals(s2))
bi1=s1+" is palindrome";
else
bi1=s1+" is not palindrome";

FileWriter outputjerry=new FileWriter("outputtext.txt");
BufferedWriter boutputjerry=new BufferedWriter(outputjerry);
boutputjerry.write(String.valueOf(bi1));
boutputjerry.flush();

}
}