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import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
public class Main{
public static void main(String[] a) {
List<String> list = new LinkedList<String>();
list.add("A");
list.add("B");
list.add("C");
list.add("D");
ListIterator<String> iter = list.listIterator(list.size());
while (iter.hasPrevious()) {
System.out.println(iter.previous());
iter.add("a");
break;
}
System.out.println(list);
}
}
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