import java.util.Vector; import java.lang.*; import java.util.Enumeration; public class VectorApp {   public static void main(String args[])   {    Vector v1 = new Vector();    Integer integer1= new Integer(1);    //加入為字符串對象    v1.addElement("one");    //加入的為integer的對象    v1.addElement(integer1);    v1.addElement(integer1);    v1.addElement("two");    v1.addElement(new Integer(2));    v1.addElement(integer1);    v1.addElement(integer1);    //轉為字符串并打印    System.out.println("The Vector v1 is:/n/t"+v1);    //向指定位置插入新對象    v1.insertElement("three",2);    v1.insertElement(new Float(3.9),3);    System.out.println("The Vector v1(used method    insertElementAt()is:/n/t)"+v1);    //將指定位置的對象設置為新的對象    //指定位置后的對象依次往后順延    v1.setElementAt("four",2);    System.out.println("The vector v1 cused method setElmentAt()is:/n/t"+v1);    v1.removeElement(integer1);    //從向量對象v1中刪除對象integer1    //由于存在多個integer1,所以從頭開始。     //找刪除找到的第一個integer1.    Enumeration enum = v1.elements();    System.out.println("The vector v1 (used method removeElememt()is");    while(enum.hasMoreElements())    System.out.println(enum.nextElement()+"");    System.out.println();    //使用枚舉類(Enumeration)的方法取得向量對象的每個元素。     System.out.println("The position of Object1(top-to-botton):"+v1.indexOf(integer1));    System.out.println("The position of Object1(tottom-to-top):"+v1.lastIndexOf(integer1));    //按不同的方向查找對象integer1所處的位置     v1.setSize(4);    System.out.println("The new Vector(resized the vector)is:"+v1);    //重新設置v1的大小，多余的元素被拋棄    } } 

E:/java01>java VectorApp The vector v1 is:[one,1,1,two,2,1,1] The vector v1(used method insetElementAt()) is: [one,1,three,3.9,1,two,2,1,1] The vector v1(used method setElementAt()) is: [one,1,four,3.9,1,two,2,1,1] The vector v1(useed method removeElement()) is: one four 3.9 1 two 2 1 1 The position of object1(top-to-botton):3 The position of object1(botton-to-top):7 The new Vector(resized the vector) is: [one,four,3.9,1] 

protected int capacityIncrement;//用于指定每次擴容的容量private void grow(int minCapacity) { // overflow-conscious code int oldCapacity = elementData.length; int newCapacity = oldCapacity + ((capacityIncrement > 0) ?          capacityIncrement : oldCapacity);//如不指定capacityIncrement，默認擴容的容量為原數組的容量 if (newCapacity - minCapacity < 0)  newCapacity = minCapacity; if (newCapacity - MAX_ARRAY_SIZE > 0)  newCapacity = hugeCapacity(minCapacity); elementData = Arrays.copyOf(elementData, newCapacity);}

private static Vector<Integer> vector=new Vector<Integer>();public static void main(String[] args) {  while(true) { for(int i=0;i<10;i++) { vector.add(i); }  Thread removeThread=new Thread(new Runnable(){ @Override public void run() { for(int i=0;i<vector.size();i++) {  vector.remove(i); } } });  Thread printThread=new Thread(new Runnable(){ @Override public void run() { for(int i=0;i<vector.size();i++) {  System.out.println(vector.get(i)); } } });  removeThread.start(); printThread.start();  while(Thread.activeCount()>20);  }}