java BufferedReader和FileReader有什么区别

FileReader : 字符流
BufferedReader : 也是字符流，但是在BufferedReader可以先把数据放到一个缓存区里，然后在进行处理，而且在BufferedReader 里有一个readLine()方法。
所谓缓冲区，就是能够一次性读取一块缓冲区大小的数据，再从缓冲区中去读取数据，而不用一点一点地直接从硬盘中抽取数据。

 public void loadData(String path) throws IOException
    {
        BufferedReader br = new BufferedReader(new FileReader(new File(path)));
        String line = br.readLine();
        while (line != null)
        {
            String[] segs = line.split("\\s");
            String label = segs[0];
            List<String> fieldList = new ArrayList<String>();
            for (int i = 1; i < segs.length; ++i)
            {
                fieldList.add(segs[i]);
                Feature feature = new Feature(label, segs[i]);
                int index = featureList.indexOf(feature);
                if (index == -1)
                {
                    featureList.add(feature);
                    featureCountList.add(1);
                }
                else
                {
                    featureCountList.set(index, featureCountList.get(index) + 1);
                }
            }
            if (fieldList.size() > C) C = fieldList.size();
            Instance instance = new Instance(label, fieldList);
            instanceList.add(instance);
            if (labels.indexOf(label) == -1) labels.add(label);
            line = br.readLine();
        }
    }