exception - Java Arraylist got java.lang.IndexOutOfBoundsException? -

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i'm general 3d artist, switched career , started learn programming. i've got problem c106a handout #5.

the code works, i've still got error log here.

exception in thread "main" java.lang.indexoutofboundsexception: index: 4, size: 4 @ java.util.arraylist.rangecheck(arraylist.java:547) @ java.util.arraylist.get(arraylist.java:322) @ uniquenames.showunique(uniquenames.java:23) @ uniquenames.main(uniquenames.java:39)

why arraylist, can stretch capacity on own, still outofboundsexception?

here's full code:

import acm.io.*; import acm.program.consoleprogram; import acm.util.*; import java.io.*; import java.util.arraylist; import java.lang.*;  public class uniquenames extends consoleprogram{    static arraylist<string> mestring = new arraylist<string>();   static string input ;      public static void storeunique(string input){         if (!mestring.contains(input))            {             mestring.add(input);             }     }      public static void showunique(arraylist<string> mestring){         system.out.println("unique name list contains:");         for(int i=0 ;i<= mestring.size() ;i++){             system.out.println(mestring.get(i));           }       }      public static void main(string[] args){               try{                 inputstreamreader stream = new inputstreamreader(system.in);                 bufferedreader br = new bufferedreader(stream);                    while (true){                        system.out.println("enter name:");                        string input = br.readline();                        if (input.equals("")) break;                        storeunique(input);                       }                      {showunique(mestring);}                   }              catch(ioexception e){                 }     } }

the following lines:

for (int = 0; <= mestring.size(); i++) {     system.out.println(mestring.get(i)); }

should be:

for (int = 0; < mestring.size(); i++) {     system.out.println(mestring.get(i)); }

this because index of list starts zero.

index: 4, size: 4 explains little more. when call get(4), exception occurs because list has size of 4. get(4) attempt access 5th element in list.

valid elements can access get(0), get(1), get(2), get(3).


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