Collection使用方法

package cn.stat.p3.conection.demo;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class conectionDemo {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
      Collection cl=new ArrayList();
   show(cl);
    }

    public static void show(Collection col)
    {
        
        col.add("aaa");
        col.add("bbb");
        col.add("ccc");
        System.out.println(col);
        Iterator it=col.iterator();
        while(it.hasNext())
        {
            System.out.println(it.next());
            
        }
        
        
    }
}

package cn.stat.p4.list.demo;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.LinkedList;



public class listDemo {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        LinkedList<String> nlist=new LinkedList<String>();
show(nlist);

    }
    
    private static void show(LinkedList nlist) {
        // TODO 自动生成的方法存根
        nlist.add("aaa");
        nlist.add("bbb");
        nlist.add("ccc");
        System.out.println(nlist);
        nlist.add(1,"ddd");
        System.out.println(nlist);
        ListIterator it=nlist.listIterator();
        while(it.hasNext())
        {
            Object obj=it.next();
            if(obj.equals("bbb"))
            {
                it.add("qqq");
                
            }
        }System.out.println(nlist);
        System.out.println(it.previous());
        System.out.println(it.previous());
        System.out.println(it.previous());
        /*
        System.out.println(nlist);
        System.out.println("remove="+nlist.remove(2));
        nlist.set(2, "qqq");
        System.out.println();
        System.out.println(nlist.get(2));
*/
    }

    public listDemo() {
        super();
        // TODO 自动生成的构造函数存根
    }

}