enumeration1.java

该原代码为＜Java编程基础、应用与实例＞的附盘代码

import java.util.*;
public class Enumeration1 implements Enumeration{
  Object[] data;
  int count=0;
  public Enumeration1(Object[] data){
    this.data=data;
  }  
  public boolean hasMoreElements(){
    return count < data.length;
  }
  public Object nextElement(){
    if (count < data.length) {
      return data[count++];
    }
    return null;
  }
  public static void main(String[] args){
    String[] arr = new String[]{ "abc", "def", "ghi", "jkl"};
    Enumeration enum = new Enumeration1(arr);
    while(enum.hasMoreElements()){
      System.out.println(enum.nextElement()); 
    }
  }
}