Java 集合 之 Iterator 迭代器

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/** 
     * 打印输出 地铁的所有站点信息 


        Iterator iterator();             
        Boolean hasNext();         
        Object next();                   

     */ 
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Test {

   
    public static void main(String[] args) {
        List stationList=new ArrayList();
        //添加站点信息
        stationList.add(new Station("北京大学"));
        stationList.add(new Station("中关村"));
        stationList.add(new Station("海淀黄庄"));
        stationList.add(new Station("人民大学"));
        
        //索引方式输出
        for(int i=0;i<stationList.size();i++)
        {
            Station station=(Station)stationList.get(i);
            System.out.print(station.getName()+" -> ");
        }
        System.out.println("");
        
        //以数组方式输出
        
        Object[] stations=stationList.toArray();
        for(int i=0;i<stations.length;i++)
        {
            Station station=(Station)stations[i];
            System.out.print(station.getName()+" -> ");
        }
        
        //以迭代器的方式输出
        System.out.println("");
        Iterator iter=stationList.iterator();
        while(iter.hasNext())//是否存在下一个元素
        {
            //获得下一个元素
            Station station=(Station)iter.next();
            System.out.print(station.getName()+" -> ");
        }
    }
    
}



//地铁站点类
public class Station {
    private String name;

    public Station(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
    
}

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