import java.util.*;
public class TestList{
public static void main(String args[]){
List list = new ArrayList();
list.add(“Hello”);
list.add(“World”);
list.add(1, “Learn”);
list.add(1, “Java”);
printList(list);
}
public static void printList(List list){
//1
//按照索引遍历
for(int i = 0; i< list.size();i++){
   System.out.println(list.get(i));
  }
  //增强for循环遍历
   for(Object o : list) {
   System.out.println(o);
  }
  //迭代器 Iterator
  //迭代器不用new
   Iterator itor = list.iterator();
   while(itor.hasNext()){
    System.out.println(itor.next());
   }

}
}