4-5编程练习

package com.file;

import java.io.*;

public class ReaderAndWriter {

public void transWriteByBuf() {

try {

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

OutputStreamWriter osw = new OutputStreamWriter(fos);

char[] ch = {'你','好','吗','?','\n','我','很','好','。'};

osw.write(ch);

osw.flush();

osw.close();

fos.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public void transReadByBuf() {

try {

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

InputStreamReader isr = new InputStreamReader(fis);

char[] cbuf = new char[300];

int n = 0;

while ((n = isr.read(cbuf)) != -1) {

System.out.println(new String(cbuf,0,n));

}

isr.close();

fis.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static void main(String[] args) {

ReaderAndWriter raw = new ReaderAndWriter();

raw.transWriteByBuf();

raw.transReadByBuf();

}

}

顺便问一下老师isr 和 fis 这种哪个先close有什么关系嘛