list与String数组的相互转化

 List转化为String数组

List<String> list = new ArrayList<String>();  

list.add("a");  

list.add("b");  

String[] strs = list.toArray(new String[list.size()]);  

for(String s : strs ) {  

     System.out.println(s);  

}

String数组转化为List

String[] letters = {"A","B","C","D"};

List<String> letterList = Arrays.asList(letters);

for (String letter : letterList) {

System.out.println(letter);

}