java - Reverse a String without affecting special characters -


why throwing error? appreciated

public class raws  { public string rawsc(string ori) {     string temp="";     for(int i=0;i<ori.length();i++)     {         char c=ori.charat(i);         if(((c>=65)&&(c<=90))||((c>=97)&&(c<122)))             temp=c+temp;     }     for(int i=0;i<ori.length();i++)     {         char c=ori.charat(i);         if(((c>=65)&&(c<=90))||((c>=97)&&(c<122)))             ori.replace(c, temp.charat(i));     }     for(int i=0;i<ori.length();i++)     {         system.out.println(ori.charat(i));     }     return(ori); } public static void main(string[] args)  {     string str="a,b$c";     raws ob=new raws();     string new1=ob.rawsc(str);     for(int i=0;i<new1.length();i++)     {         system.out.print(new1.charat(i)+" ");     } } }

editor:

exception in thread "main" java.lang.stringindexoutofboundsexception: string index out of range: 4  @ java.lang.string.charat(string.java:658)  @ arraygs.raws.rawsc(raws.java:22)  @ arraygs.raws.main(raws.java:30)

the problematic part call temp.charat(i) in

for(int i=0;i<ori.length();i++){     char c=ori.charat(i);     if(((c>=65)&&(c<=90))||((c>=97)&&(c<122)))         ori.replace(c, temp.charat(i)); }

the string temp may not have length of ori. reason if-condition in first loop 

for(int i=0;i<ori.length();i++) {     char c=ori.charat(i);     if(((c>=65)&&(c<=90))||((c>=97)&&(c<122)))         temp=c+temp; }

so accessing position i in temp (as part of second loop) may result in java.lang.stringindexoutofboundsexception.


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