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();
}
}