java - Adding and Subtracting numbers from a String -


this program takes in string , adds integers in it, have set delimiter "+" surrounded amount of white space. works fine want work negative integers well, instance if input "8 + 33 + 1,345 - 37"; output 41.it doesn't 1,345 or subtracts -37 total. delimiters "skipped" ? instance, correct if compiler goes 8 , '+' skipped goes 33? , if set delimiter "\s*\+|-\s*" (an attempt of + or -), output still 41, why?

import java.util.*;   import java.io.*;  public class add_em_up   {              public static void main (string args [])                      {                   scanner x = new scanner (system.in);               system.out.print("enter 8 + 33 + 1,345 + 137 :");               string s = x.nextline();              scanner sc1 = new scanner (s);             sc1.usedelimiter("\\s*\\+\\s*");                              int sum = 0;             while (sc1.hasnextint())             {                 sc1.skip(",*");                 if (sc1.hasnextint())                 {                     sum = sum + sc1.nextint();                                  }              }             system.out.println("sum is: " + sum);         }   }

just put +, - inside character class.

sc1.usedelimiter("\\s*[-+]\\s*");

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