package bag;import java.util.Vector;public class aaa{public static void main(String [] args){Vector myVector=new Vector();//myVector.addElement(Integer.valueOf(1));//addchar ch = 'A';myVector.insertElementAt(Character.valueOf(ch), 0);//insertmyVector.setElementAt(Integer.valueOf(2),1);//set A at place,(replace)myVector.removeElement(Integer.valueOf(2));//remove IntegermyVector.removeElementAt(0);//remove at:imyVector.addElement(Integer.valueOf(3));//addmyVector.removeAllElements();//格式化myVector.addElement(Integer.valueOf(4));//addmyVector.addElement(Integer.valueOf(5));//addmyVector.addElement(Integer.valueOf(6));//add/*for (int i:myVector-+) {System.out.println("集合元素为"+i);}*/if(myVector.contains(Integer.valueOf(4))) {int Int=(int)myVector.elementAt(0);//找第n个数System.out.println(Int);System.out.println(myVector.indexOf(Integer.valueOf(4),0));//向后找数System.out.println(myVector.lastIndexOf(Integer.valueOf(5),2));//向前找数}else {System.out.print("false");}}}