【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();
        
    
    }
}