<pre name="code" class="java">for(int i = 0 , len= list.size();i<len;++i){ 
 
 if(list.get(i)==XXX){ 
 
    list.remove(i); 
 
 } 
 
}

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 3, Size: 3 
  at java.util.ArrayList.RangeCheck(Unknown Source) 
  at java.util.ArrayList.get(Unknown Source) 
  at ListDemo.main(ListDemo.java:20) 

for(int i = 0 , len= list.size();i<len;++i){ 
 
 if(list.get(i)==XXX){ 
 
    list.remove(i); 
    --len;//减少一个 
 } 
 
}

Iterator<String> sListIterator = list.iterator(); 
while(sListIterator.hasNext()){ 
  String e = sListIterator.next(); 
  if(e.equals("3")){ 
  sListIterator.remove(); 
  } 
}