将String数组转换成ArrayList

 package org.donkey.app.ListToArrayList;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 /**
  * Created with IntelliJ IDEA.
  * User: Donkey
  * Date: 13-11-24
  * Time: 上午10:44
  * 用于将String类型的数组转变为ArrayList
  */
 public class StringArrayToArrayListTest {
     public static void main(String[] args){
         StringArrayToArrayListTest.test1();
         StringArrayToArrayListTest.test2();
         StringArrayToArrayListTest.test3();
     }

     public static void test1(){
         String[] words = {"ace", "boom", "crew", "dog", "eon"};

         List wordList = Arrays.asList(words);
         //wordList.add("1");
         for (String e : wordList){
             System.out.println(e);
         }
     }

     public static void test2(){
         String[] words = {"ace", "boom", "crew", "dog", "eon"};

         List wordList = new ArrayList(Arrays.asList(words));
         wordList.add("1");
         for (String e : wordList){
             System.out.println(e);
         }
     }

     public static void test3(){
         String[] words = {"ace", "boom", "crew", "dog", "eon"};

         List wordList = new ArrayList(words.length);

         for (String e : words){
             wordList.add(e);
         }
         wordList.add("2");
         for (String e : wordList){
             System.out.println(e);
         }
     }
 }

将三种方式的算法对比一下，我们可以分析出test1中的方法是效率最高的，因为他不需要复制array中的内容，而是直接返回一个List,但这种方式是不能添加和删除元素的。

test2和test3本质上是一种方式，它们将创建array的副本到ArrayList中，当然就可以实现增删功能。

两种方式要根据自己的需求而定。

PS:使用方法一的时候出现了下面的错误，最后使用方法二没有问题

03-09 12:54:42.699: E/AndroidRuntime(21587): FATAL EXCEPTION: AsyncTask #1
03-09 12:54:42.699: E/AndroidRuntime(21587): Process: com.clockrock.freeshare, PID: 21587
03-09 12:54:42.699: E/AndroidRuntime(21587): java.lang.RuntimeException: An error occured while executing doInBackground()
03-09 12:54:42.699: E/AndroidRuntime(21587): at android.os.AsyncTask$3.done(AsyncTask.java:300)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
03-09 12:54:42.699: E/AndroidRuntime(21587): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.lang.Thread.run(Thread.java:848)
03-09 12:54:42.699: E/AndroidRuntime(21587): Caused by: java.lang.ClassCastException: java.util.Arrays$ArrayList cannot be cast to java.util.ArrayList
03-09 12:54:42.699: E/AndroidRuntime(21587): at com.clockrock.pla.activity.PlaImageFragment$ContentTask.parseNewsJSON(PlaImageFragment.java:113)
03-09 12:54:42.699: E/AndroidRuntime(21587): at com.clockrock.pla.activity.PlaImageFragment$ContentTask.doInBackground(PlaImageFragment.java:60)
03-09 12:54:42.699: E/AndroidRuntime(21587): at com.clockrock.pla.activity.PlaImageFragment$ContentTask.doInBackground(PlaImageFragment.java:1)
03-09 12:54:42.699: E/AndroidRuntime(21587): at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-09 12:54:42.699: E/AndroidRuntime(21587): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-09 12:54:42.699: E/AndroidRuntime(21587): ... 4 more