【java】读写文件

不要吐槽我为啥不写try,catch。

默认的相对路径是在工作空间的目录下。

如图

 import java.io.*;
 import java.util.*;

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

         String pathname = "in.txt";
         FileReader reader = new FileReader(pathname);
         BufferedReader br = new BufferedReader(reader);
         String tmpString;
         while( (tmpString = br.readLine())!= null) {
             System.out.println(tmpString);
         }

         File file = new File("out.txt");

         FileWriter fw = new FileWriter(file.getName(),true);
         String data = " This is a test";
         fw.write(data);
         fw.close();

         FileWriter fw1 = new FileWriter(file);
         BufferedWriter bw = new BufferedWriter(fw1);
         bw.write(data);
         bw.close();

     }
 }