java中文件读和写的操作

import java.io.*;//文件读class FileReadTest { public static void main (String[] args) { FileReadTest t = new FileReadTest(); t.readMyFile();} void readMyFile() { String record = null; int recCount = 0; try {FileReader fr = new FileReader("mydata.txt"); BufferedReader br = new BufferedReader(fr); record = new String(); while ((record = br.readLine()) != null) { recCount++; System.out.println(recCount + ": " + record);}br.close();fr.close(); } catch (IOException e) { System.out.println("Uh oh, got an IOException error!"); e.printStackTrace(); }} }

 

 

/////////////////////////////////////////////////////文件写import java.io.*;class FileWriteTest { public static void main (String[] args) { FileWriteTest t = new FileWriteTest(); t.WriteMyFile();} void WriteMyFile() { try {FileWriter fw = new FileWriter("mydata.txt");PrintWriter out = new PrintWriter(fw); out.print(“hi,this will be wirte into the file!”); out.close();fw.close(); } catch (IOException e) { System.out.println("Uh oh, got an IOException error!"); e.printStackTrace(); }} }