16， java set 转list方法

Map<String, String> map = new HashMap<String, String>();  
map.put("ele1", "小樱");  
map.put("ele2", "若曦");  
map.put("ele3", "晴川");  
Set<String> set = map.keySet();  
1. 通过ArrayList进行转换
List<String> list1 = new ArrayList<String>(set);  
for(int i = 0; i < list1.size(); i++){  
    System.out.println("list1(" + i + ") --> " + list1.get(i));  
}
2. List实现类进行转换
List<String> list2 = new ArrayList<String> ();  
list2.addAll(set);  
for(String elem : list2){  
    System.out.println(elem);  
}