4.5练习

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

public class ReadWriteTest {

public static void main(String[] args) {

transWriteBybuf();

transReadBybuf();

}

    public static void transWriteBybuf() {

//    return "你好吗？\n我很好！";

    try {

    FileInputStream fis=new FileInputStream("helle.txt");

    BufferedInputStream bis=new BufferedInputStream(fis);

    InputStreamReader isr=new InputStreamReader(bis);

//     fis.close();

//     bis.close();

//     isr.close();

    } catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

    }

    public static void transReadBybuf() {

    try {   

    FileOutputStream fos=new FileOutputStream("helle.txt");

    BufferedOutputStream bos=new BufferedOutputStream(fos); 

    OutputStreamWriter osw=new OutputStreamWriter(bos);

    osw.write("你好吗？\n我很好！");

    osw.flush();

    fos.close();

    bos.close();

    osw.close();     

    } catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

    }

}

创建两个方法分别表示输入，读取    请问字节字符的输入流怎么关闭， readLine()怎么用？