以下程序的输出结果为 ( ) import java.util.*; public class ListIteratorDemo { public static void main(String[] args) { List list = new ArrayList(); for(int i=1; i<5; i++){ list.add(new Integer(i)); } System.out.println("The original list : "+list); ListIterator listIter = list.listIterator(); listIter.add(new Integer(0)); System.out.println("After add at beginning:"+list); if ( listIter.hasNext() ) { int i = listIter.nextIndex(); listIter.next(); listIter.set(new Integer(9)); System.out.println("After set at "+i+":"+list); } if ( listIter.hasNext() ) { int i = listIter.nextIndex(); listIter.next(); listIter.remove(); System.out.println("After remove at "+i+" : "+list); }