vectordemo.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter8;

import java.util.*;

class VectorDemo
{
    public static void main(String args[])
    {
        // 初始大小为3，增量为2
        Vector v = new Vector(3, 2);
        System.out.println("Initial size: " + v.size());
        System.out.println("Initial capacity: " + v.capacity());
        v.addElement(new Integer(1));
        v.addElement(new Integer(2));
        v.addElement(new Integer(3));
        v.addElement(new Integer(4));
        System.out.println("Capacity after four adds: " + v.capacity());
        v.addElement(new Double(5.45));
        System.out.println("Current capacity: " + v.capacity());
        v.addElement(new Double(6.08));
        v.addElement(new Integer(7));
        System.out.println("Current capacity: " + v.capacity());
        v.addElement(new Float(9.4));
        v.addElement(new Integer(10));
        System.out.println("Current capacity: " +
        v.capacity());
        v.addElement(new Integer(11));
        v.addElement(new Integer(12));
        System.out.println("First element: " + (Integer)v.firstElement());
        System.out.println("Last element: " + (Integer)v.lastElement());
        if(v.contains(new Integer(3)))
            System.out.println("Vector contains 3.");
        // 枚举向量中的元素
        Enumeration vEnum = v.elements();
        System.out.println("\nElements in vector:");
        while(vEnum.hasMoreElements())
            System.out.print(vEnum.nextElement() + " ");
        System.out.println();
    }
}