List集合遍历的三种方法

测试数据：

1 List<String> list = new ArrayList<String>();
2         list.add("java");
3         list.add("hello");
4         list.add("se");
5         list.add("ee");

1. 普通for循环

1 for (int i = 0; i < list.size(); i++) {
2             String s = (String)list.get(i);
3             System.out.println(s);
4         }

1 java
2 hello
3 se
4 ee

2. 增强for

1 for (String s : list) {
2             System.out.println(s);
3         }

1 java
2 hello
3 se
4 ee

3. 迭代器

1 Iterator it = list.iterator();
2         while (it.hasNext()) {
3             System.out.println(it.next());
4         }

1 java
2 hello
3 se
4 ee