Java Vector class detailed explanation and example code

Java Vector class

Vector’s unique functions

Vector appears earlier, earlier than collections

1: Add functions

public void addElement(Object obj);//用add()替代

2: Get the function

public Object elementAt(int index);//用get()替代
public Enumeration elements();//返回的是实现类的对象，用Iterator iterator()

import java.util.Enumeration;
import java.util.Vector;
  
/*
 * Vector的特有功能
 *
 * Vector出现较早，比集合更早出现
 *
 * 1：添加功能
 * public void addElement(Object obj);//用add()替代
 *
 * 2：获取功能
 * public Object elementAt(int index);//用get()替代
 * public Enumeration elements();//返回的是实现类的对象，用Iterator iterator()
 * */
  
public class IntegerDemo {
  public static void main(String[] args) {
    // TODO Auto-generated method stub
  
    Vector v = new Vector();
  
    v.addElement("hello");
    v.addElement("world");
    v.addElement("java");
  
    for (int i = 0; i < v.size(); i++) {
      String s = (String) v.elementAt(i);
  
      System.out.println(s);
    }
  
    System.out.println("---------------");
  
    for (Enumeration en = v.elements(); en.hasMoreElements();) {
      String s = (String) en.nextElement();// 返回的是实现类的对象
  
      System.out.println(s);
    }
  }
}

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