List與數組 之間的轉換

List與數組 之間的轉換

package com.jo;

import java.util.List;
import java.util.ArrayList;

public class List2Array {

public static void main(String[] args) {  // TODO Auto-generated method stub  String[] ss ={"hello","world","huan","ying"};  System.out.println("list2Array:"+ss.length);  List ll = array2List(ss);  System.out.println("array2List:"+ll);  String[] ss2= list2Array(ll);  System.out.println("list2Array:"+ss2.length); } //數組轉換爲List public static List<String> array2List(String[] strs){  List<String> list = new ArrayList<String>();  for(String str:strs){   list.add(str);  }  return list; }    //List轉換爲數組 public static String[] list2Array(List<String> list){ //  String[] strs = (String[])list.toArray();  String[] strs1 = list.toArray(new String[list.size()]);  return strs1; } }