字符串和list互转

String[] strs = {"aa", "bb", "cc"}; //String数组

//方法1
List<String> list1 = Arrays.asList(strs);
// Arrays.asList()是个坑，用此方法得到的List的长度是不可改变的，就是只能查不能增删
//方法2
List<String> list2 = new ArrayList<String>();
Collections.addAll(list2, strs);

//方法3
List<String> list3 = new ArrayList<String>();
for(String item : strs){
    list3.add(item);
}

List<String> list = new ArrayList<>(); //list
list.add("a");
list.add("b");
list.add("c");

//方法1
String[] strs1 = list.toArray(new String[list.size()]);

//方法2
String[] strs2 = new String[list.size()];
for(int i=0; i<list.size(); i++){
   strs2[i] = list.get(i);
}

import org.apache.commons.lang.StringUtils;
List<String> list=new ArrayList<String>();
list.add("first");
list.add("second");
list.add("third");

org.apache.commons.lang.StringUtils.join(list.toArray(), ",")

List idList = Arrays.asList(phones.split(";"));