java _io_字符缓冲流的输入、输出

新增方法:
输入:
BufferedReader breader=new BufferedReader(Reader reader);
.readLine()读取一行内容，返回字符串
输出:
BufferedWriter bwriter=new BufferedWirter(Writer writer);
.newLine() 写入一个换行符

输入:
File f =new File("C:\Users\10853\eclipse-workspace\hell\src\hell\abc");
BufferedReader reader=null;
try {

        reader=new BufferedReader(new FileReader(f));        String line=null;        while((line=reader.readLine())!=null)//要添上!=null，不像c语言赋值表达式整个也有个真假结果        {            System.out.println(line);        }    }catch(FileNotFoundException e)    {        e.printStackTrace();    }catch(IOException e)    {        e.printStackTrace();    }finally {        try {            if(null!=reader)            {                reader.close();            }        }catch(IOException e)        {            e.printStackTrace();        }    }

输出:

    File f=new File("D:d/c.txt");    BufferedWriter bwriter=null;    try    {        bwriter=new BufferedWriter(new FileWriter(f));        String s="addad";        bwriter.write(s);        bwriter.newLine();        bwriter.append("aaaff");        bwriter.flush();    }catch(FileNotFoundException e)    {        e.printStackTrace();    }catch(IOException e)    {        e.printStackTrace();    }finally {        try {            if(null!=bwriter)            {                bwriter.close();            }        }catch(IOException e)        {            e.printStackTrace();        }       }