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Anyone knowing what is happening below?
It keeps bumping out the <identifier> expected error.
import java.util.Scanner;
class IngeniusXD
{Scanner scn = new Scanner(System.in);
 private String Simplify(String cal ,char st ,char nd ,char new)
 {for (int i = 0;i < cal.length() -1; i++)
  {if ((cal.charAt(i) == st) || (cal.charAt(i + 1) == nd))
   {cal = cal.substring(0 ,i - 1) + new + cal.substring(i + 2);}
   else if ((cal.charAt(i) == nd) || (cal.charAt(i + 1) == st))
   {cal = cal.substring(0 ,i - 1) + new + cal.substring(i + 2);}}
  return cal;}
 public String Simplify_General(String cal)
 {cal = Simplify(cal ,'+' ,'-' ,'-');
  cal = Simplify(cal ,'-' ,'-' ,'+');
  cal = Simplify(cal ,'+' ,'+' .'+');
  return cal;}
 public void Simplify_Test()
 {System.out.println("Simplify_Test:Input mathematical sentence.");
  cal = scn.next();
  cal = Simplify_General(cal);
  System.out.println("Simplify_Test:Output=");}
 public static void main(String[] args)
 {SimplifyTest();}}

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Help Isaac Chan <isaacchanszelong@gmail.com> - 2014-03-24 03:32 -0700
  Re: Help Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-24 08:36 -0400
  Re: Help Joerg Meier <joergmmeier@arcor.de> - 2014-03-24 14:00 +0100
    Re: Help Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 08:16 -0700
      Re: Help Roedy Green <see_website@mindprod.com.invalid> - 2014-03-26 17:50 -0700
  Re: Help Isaac Chan <isaacchanszelong@gmail.com> - 2014-03-25 06:34 -0700
  Re: Help Isaac Chan <isaacchanszelong@gmail.com> - 2014-03-25 06:54 -0700
    Re: Help Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 08:17 -0700
    Re: Help Knute Johnson <eternal@knutejohnson.com> - 2014-03-25 08:55 -0700
    Re: Help Lew <lewbloch@gmail.com> - 2014-03-25 15:12 -0700

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