java中怎么用io流读写文件

import java.io.BufferedReader

import java.io.BufferedWriter

import java.io.FileReader

import java.io.FileWriter

import java.io.IOException

public class Test14 {

    public static void main(String[] args) throws IOException {

        String fPath = "C:/test.txt"

        // 读

        BufferedReader br = new BufferedReader(new FileReader(fPath))

        System.out.println(br.readLine())

      渣卖蔽  br.close()// // 使用后记得关闭

 配碧 如州      // 写

        BufferedWriter bw = new BufferedWriter(new FileWriter(fPath))

        bw.write("写一段话到文件里")

        bw.flush()

        bw.close()// 使用后记得关闭

    }

}

import java.io.BufferedReader

import java.io.FileReader

import java.io.IOException

class ThreadDemo{

public static void main(String[] args) throws IOException{

BufferedReader fr=new BufferedReader(new FileReader("a.txt"))//a.txt代表芹模首岩文件嫌芹缓

String line=null

while((line=fr.readLine())!=null){

System.out.println(line)

}

}

}

---