List集合遍历的三种方法

测试数据：

 List<String> list = new ArrayList<String>();
         list.add("java");
         list.add("hello");
         list.add("se");
         list.add("ee");

1. 普通for循环

 for (int i = ; i < list.size(); i++) {
             String s = (String)list.get(i);
             System.out.println(s);
         }

 java
 hello
 se
 ee

2. 增强for

 for (String s : list) {
             System.out.println(s);
         }

 java
 hello
 se
 ee

3. 迭代器

 Iterator it = list.iterator();
         while (it.hasNext()) {
             System.out.println(it.next());
         }

 java
 hello
 se
 ee