Thread: caught or declare might be thrown error

public class CreateFileMain{
 
  public static void main(String[] args){
 
  CreateFile object = new CreateFile();
 
  object.openFile();
 
  object.writeFile();
 
  object.closeFile();
 
}
}

import java.io.*;
 
public class CreateFile{
 
  BufferedWriter in;
 
  public void openFile(){
 
    try{
 
    in = new BufferedWriter(new FileWriter("C:\\Users\\Hiep\\Desktop\\Java Programming\\file.text"));  
 
    System.out.println("shell, something is wrong");
 
     }catch(Exception e){
 
    }
  }
 
  public void writeFile(){
 
    in.write("You did it");
  }
 
  public void closeFile(){
 
    in.close();
 
  }
}

any idea. I did some research but i still can't fix it.

    public void openFile() {
        try {
            in = new BufferedWriter(new FileWriter("C:\\Users\\Hiep\\Desktop\\Java Programming\\file.text"));
            System.out.println("shell, something is wrong");
        } catch (IOException e) {
        }
    }
 
    public void writeFile() {
        try {
            in.write("You did it");
        } catch (IOException ex) {
        }
    }
 
    public void closeFile() {
        try {
            in.close();
        } catch (IOException ex) {
        }
 
    }

As all your methods do some sort of file handling, and the exceptions that could arise are checked exceptions, you're required to attempt to catch or throw a possible exception for all your methods.
Unless say openFile() called writeFile(), then you would only require one try...catch block to handle both.

On a side note, next time please try and structure your questions better, include more information about your problem and what you have tried yourself. The clearer the question the more help you will get.

import java.io.*;
 
import java.lang.*;
 
import java.util.*;
 
public class CreateFile{
 
  private Formatter in;
 
  public void openFile(){
 
    try{
 
    in = new Formatter("C:\\Users\\Luke\\Desktop\\Java Programming\\file.text");
 
 
 
 
    System.out.println("shell, something is wrong");
 
     }catch(Exception e){
 
    }
  }
 
  public void writeFile(){
 
    in.format("%s%s%s","test","test","test");
  }
 
  public void closeFile(){
 
    in.close();
 
  }
}

can you tell me why this does require the IOException in every method? also, i don't understand why in need this IOexception