Java集合List的代码实现

package com.hhj;

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

public class Test_001 {
public static void main(String [] args)
{
List list=new ArrayList();
String b="B";
list.add("A");
list.add(b);
list.add("C");
list.add("D");
list.add("E");
System.out.println("集合size="+list.size());
System.out.println(list);

System.out.print(".................");
for (int i=0;i<list.size();i++)
{
System.out.println("使用for遍历输出list:"+list.get(i));

}

System.out.print("............................");

for (Object item:list)
{
String s=(String)item;
System.out.println("使用增强for遍历输出list:"+s);
}

System.out.println(".......................");
System.out.println("使用Iterator");
Iterator it=list.iterator();
while (it.hasNext()){
Object ittem=it.next();
String s=(String) ittem;
System.out.println("读取元素："+s);
}
}
}