写出以下程序的运行结果。 import java.util.*; public class Vec{ public static void main(String[] args) { String[] s=new String[2]; s[0]=new String("str1"); s[1]=new String("str2"); Vector v = new Vector(); for(int i = 0; i <2; i++) v.addElement(s[i]); v.insertElementAt(new String("str0"),0); Enumeration e = v.elements(); while(e.hasMoreElements()) System.out.print(e.nextElement()+" "); System.out.println(); v.removeElement("str1"); for(int i = 0; i < v.size(); i++) System.out.print(v.elementAt(i) +" "); System.out.println(); } }