java code keeps throwing exception -


my code throws exception java.lang.string.charat @ line in code :

while(0 == chartoint(value.charat(startvalueat))){

in code segment, 

private static arraylist<integer> stringtoarray(string value){       arraylist<integer> holder = new arraylist<integer>();       int startvalueat = 0;        if(value.charat(0)=='-'|| value.charat(0)=='+')          startvalueat= 1;      else          startvalueat = 0;       while(0 == chartoint(value.charat(startvalueat))){           startvalueat++;       }       int startofvalue = value.length() - (startvalueat - 1);       //to make sure arraylist right size , last element ends @ 0 find starting index of j above step      //we use value of startvalueat      for(int = startofvalue, j = startvalueat; j <= value.length() - 1; i--, j++){            holder.add(0, chartoint(value.charat(j)));      }       return holder;  }

here stack trace:

exception in thread "main" java.lang.stringindexoutofboundsexception: string     index out of range: 4  @ java.lang.string.charat(string.java:686)  @ bigint.stringtoarray(bigint.java:145)  @ bigint.<init>(bigint.java:35)  @ bigint.multiplybysingledigit(bigint.java:853)  @ bigint.multiplypositives(bigint.java:878)  @ bigint.multiplyonenegative(bigint.java:920)  @ bigint.multiply(bigint.java:778)  @ bigint_add_sub_mul_div_mod_demo.main(bigint_add_sub_mul_div_mod_demo.java:164) 

while(startvalueat < value.length() && 0 == chartoint(value.charat(startvalueat))){     startvalueat++; }

you ignoring case string 0s. call value.charat(value.length()) throws exception.


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