基本的なアルゴリズムは、いくつかの文を含む入力ファイルがあり、各文が各行にあります。位置 s から e までの文の一部を出力したいのですが、以下のコードでは空白行が出力されます。私の間違いがどこにあるのか教えてください。
public class Email13
{
static boolean isValidEmailCharacter(char c)
{
boolean result = false;
if((c>='A'&&c<='Z')||(c>='a'&&c<='z')||(c>='0'&&c<='9')||(c=='.')||(c=='-')||(c=='+'))
result = true;
return result;
}
public static void main(String[] args) throws Exception{
BufferedReader cin, fin;
cin = new BufferedReader(new InputStreamReader(System.in));
//Description
System.out.println("Programmer: Minh Nguyen");
System.out.println("Description: This program is to start the final project.");
System.out.println();
String nameIn, nameOut, deIn, deOut;
nameIn="";
nameOut="";
deIn = "fileContainingEmails.txt";
System.out.print("Enter input filename [default:" + deIn + "]: ");
nameIn = cin.readLine();
if(nameIn.compareTo("")==0){
nameIn = deIn;
deOut = "copyPasteMyEmails.txt";
System.out.print("Enter output filename [default:" + deOut + "]: ");
nameOut = cin.readLine();
if(nameOut.compareTo("")==0)
nameOut = deOut;
}
else if(nameIn.compareTo("")>0){
deOut = nameIn;
System.out.print("Enter output filename [default:" + deOut + "]: ");
nameOut = cin.readLine();
if(nameOut.compareTo("")==0)
nameOut = nameIn;
}
fin = new BufferedReader(new FileReader(nameIn));
//Read the input file
while(true)
{
if(!fin.ready()) break;
String lineFromFile;
lineFromFile = fin.readLine();
int s, e, hasDot;
for (int i = 0; i < lineFromFile.length(); i++) // for each char in the string...
{
if(lineFromFile.charAt(i)=='@')
{
for(s=i;s>-1;s--)
{
if(isValidEmailCharacter(lineFromFile.charAt(s))==false)
break;
}
for(e=i; e< lineFromFile.length(); e++)
{
if(isValidEmailCharacter(lineFromFile.charAt(e))==false)
break;
}
String anEmail = lineFromFile.substring(s,e);
System.out.println(anEmail);
}
}
}
fin.close();
PrintWriter fout;
fout = new PrintWriter(new FileWriter(nameOut));
fout.close();
}
}