[java进阶]Java读取和写入txt文件

 import java.io.*;

    
 import java.util.ArrayList;
    
 import java.util.List;
    
  
    
 public class unitTest {
    
     public static void main(String[] args){
    
     List<String> checkins = new ArrayList(); // List初始化
    
     try{
    
         String pathname = "*\ checkins.txt";
    
         File filename = new File(pathname);
    
         InputStreamReader reader = new InputStreamReader(new FileInputStream(filename));
    
         BufferedReader br = new BufferedReader(reader);
    
         String line = "";
    
         line = br.readLine();