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("
");
                            }
                        }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,"
");
    }
    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("
");
            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？
        
    }