Java中的vector类使用方法示例详解

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);  //加入为字符串对象  v1.addElement("one");  //加入的为integer的对象  v1.addElement(integer1);  v1.addElement(integer1);  v1.addElement("two");  v1.addElement(new Integer(2));  v1.addElement(integer1);  v1.addElement(integer1);  //转为字符串并打印  System.out.println("The Vector v1 is:/n/t"+v1);  //向指定位置插入新对象  v1.insertElement("three",2);  v1.insertElement(new Float(3.9),3);  System.out.println("The Vector v1(used method  insertElementAt()is:/n/t)"+v1);  //将指定位置的对象设置为新的对象  //指定位置后的对象依次往后顺延  v1.setElementAt("four",2);  System.out.println("The vector v1 cused method setElmentAt()is:/n/t"+v1);  v1.removeElement(integer1);  //从向量对象v1中删除对象integer1  //由于存在多个integer1,所以从头开始。  //找删除找到的第一个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();  //使用枚举类(Enumeration)的方法取得向量对象的每个元素。  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));  //按不同的方向查找对象integer1所处的位置  v1.setSize(4);  System.out.println("The new Vector(resized the vector)is:"+v1);  //重新设置v1的大小，多余的元素被抛弃  } } 

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;//用于指定每次扩容的容量private void grow(int minCapacity) { // overflow-conscious code int oldCapacity = elementData.length; int newCapacity = oldCapacity + ((capacityIncrement > 0) ?   capacityIncrement : oldCapacity);//如不指定capacityIncrement，默认扩容的容量为原数组的容量 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);  }}