对于如ArrayList<E>类的数据，常用iterator遍历。
ArrayList<String> list = new ArrayList<String>();
list.add("1");
list.add("2");
list.add("3");
Iterator<String> iterator = list.iterator();
for(;iterator.hasNext();){
String aString = iterator.next();
System.out.println(aString);
if(aString=="1"){
iterator.remove();
}
}
iterator = list.iterator();
for(;iterator.hasNext();){
String aString = iterator.next();
System.out.println(aString);
}
注意的是：
/**
* Returns an iterator over the elements in this list in proper sequence.
*
* <p>The returned iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
*
* @return an iterator over the elements in this list in proper sequence
*/
public Iterator<E> iterator() {
return new Itr();
}