TextFile 类的创写

TextFile 作为自写的方法，继承自List<String>。像统计文本中出现的哪些单词，不重复等等，适合用Set集合完成统计。

 class TextFile extends ArrayList<String>{
         public static String read(String filename){
             StringBuilder sb=new StringBuilder();
             try{
                 BufferedReader in=new BufferedReader(new FileReader(
                         new File(filename).getAbsoluteFile()));
                     try{
                         String s;
                         while((s=in.readLine())!=null){
                             sb.append(s);
                             sb.append("\n");
                             }
                         }finally{
                 in.close();
                 }
             }catch(IOException e){
                 throw new RuntimeException(e);
             }
             return sb.toString();
     }
     public TextFile(String filename,String splitter){
         super(Arrays.asList(read(filename).split(splitter)));
         if(get(0).equals("")) remove(0);
     }
     public TextFile(String filename){
         this(filename,"\n");
     }
     public void write(String filename){
         try{
             PrintWriter out=new PrintWriter(new File
                     (filename).getAbsoluteFile());
             try{
                 for(String item : this) out.println(item);
             }finally{
                 out.close();
                 }
             }catch(IOException e){
                 throw new RuntimeException(e);
                 }

     }
     public static void write(String filename,String text){
     // 其中filename指明要写入的文件名，text指明写入的字符串内容
         try{
             FileWriter fwriter=new FileWriter(new File
                     (filename).getAbsoluteFile());
             BufferedWriter out=new BufferedWriter(fwriter);
             String []tx=text.split("\n");
             try{
                 for(int i=0;i<tx.length;i++)
                 {
                     out.write(tx[i]);
                     out.newLine();
                 }
             }finally{
                 out.flush();
                 out.close();
                 }
             }catch(IOException e){
                 throw new RuntimeException(e);

             }

     }
 }

    public static void main(String[] args) {
        Set<String> words = new TreeSet<String>(
            new TextFile("StatckTest.java","\\W+"));
        System.out.print(words);
        System.out.println(words.size());

        Set<String> words2 = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
        words2.addAll(words);
        System.out.print(words2);
        System.err.println(words2.size());

        //这里有什么不同的？

    }