java - Fail to use a substring to print out part of a sentence -


the basic algorithm have input file has number of sentences, each sentence on each line.i want print out part of sentence position s e code below, prints out blank lines.can show me mistakes is?

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: program start 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 input file         while(true)         {             if(!fin.ready()) break;             string linefromfile;             linefromfile = fin.readline();             int s, e, hasdot;              (int = 0; < linefromfile.length(); i++) // each char in 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();             }  } 

    try doesn't work:(                  s=i;   while(s>-1)   {       if(isvalidemailcharacter(linefromfile.charat(s))==false)         break;       else           s = 0;       s--;   }   e=i;   while(e< linefromfile.length())   {       if(isvalidemailcharacter(linefromfile.charat(e))==false)       break;       else           e = linefromfile.length();       e++;`enter code here`   }

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