java - Example of exception in ArrayList? -

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I am using ArrayList and if I try to access the same list without multiple thread synchronization, then I Want an example of exception? I have done this in a single threaded application, in which if we remove an element from the list, iterates, concurrent improvement throws the acupineine, but I want to get it in a multi-threaded environment. If someone can give me an example of what would be highly appreciated? 

  package com.test2; Expands the public class threads threshold {list list = new arrelisted & lt; String & gt; (); @ Override Public Wide Run () {list.add ("1"); List.add ("2"); List.add ("3"); List.add ("4"); List.add ("5"); Try {Thread.sleep (1); } Grip (Interrupted e) e.printStackTrace (); } List.add ("6"); List.add ("7"); List.add ("8"); Iterator & LT; String & gt; This = list.iterator (); While (this hasNext ()) {System.out.println (it.next ()); }} Public static zero main (string [] args) {thread th1 = new thread test (); Thread Th 2 = New Thread Test (); Thread Th3 = New Thread Test (); Th1.start (); Th2.start (); Th3.start (); Try {th1.join (); Th2.join (); Th3.join (); } Grip (Interrupted e) e.printStackTrace (); You are reaching a different list frequency in each of your threads I / O  
  list list = new array list & lt; String & gt; ();   
 This declares an  example field , therefore, each call to  new thread test ()  creates a new list for all  Thread Test  To use the same list of examples, try to make the field  stable  (i.e.  class field ):  
  Fixed list list = new array list & lt; String & gt; ();  How  may be an error, take a look at this:  
  add public boolean (ee) {confirmCapacityInternal (size + 1); // increase modCount !! Element data [size ++] = e; Back true; }   
 If two threads add  at the same time, they can process the  elementData [size ++] = e  statement at the same time Time. ; Therefore, two threads can be written in the same index in the  elementData  array.  
 Even if  size  is declared  unstable ,  size ++  operation  not atom    For example that an operation like  size ++  may fail in a multithreaded environment.  
 Finally, if you do not know whether the  is unstable in Java context and atomic midi, you really need to read on concurrent programming in Java before you can get any multi -If writing code, this will be a meaningful investment because you will save many headaches by understanding these concepts.

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