i don't know where is the IOExcpetion is thrown

import java.io.*;    public class test  {      public static void main(String[] args){          File file = new File("output.txt");          FileWriter writer = null;          writer = new FileWriter(file, true);          writer.write("hi");          writer.flush();      }  }  

my computer is MacBook and there was this error in the last 3 lines I can't find what the problem is

https://stackoverflow.com/questions/66631747/i-dont-know-where-is-the-ioexcpetion-is-thrown March 15, 2021 at 10:46AM