Home/ Questions/The complete guide to the unreported exception filenotfoundexception; must be caught or declared to be thrown issue
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Madeline O'Brien
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Asked: 2022-05-18T15:53:25+00:00 In:

The complete guide to the unreported exception filenotfoundexception; must be caught or declared to be thrown issue

  • 17

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Here is the program I run:

import java.io.*;
 
 public class Testing {
 
  public static void main(String[] args) {
 
  File file = new File ("file.txt");
  file.getParentFile().mkdirs();
 
  PrintWriter printWriter = new PrintWriter(file);
  printWriter.println ("hello");
  printWriter.close(); 
  }
 }

After I run, it returns an error:

----jGRASP exec: javac -g Testing.java
 
 Testing.java:10: error: unreported exception FileNotFoundException; must be caught or declared to be thrown
  PrintWriter printWriter = new PrintWriter(file);
  ^
 1 error
 
  ----jGRASP wedge2: exit code for process is 1.

Does anyone have any suggestions for the problem below: unreported exception filenotfoundexception; must be caught or declared to be thrown in the java- How to correct it?

printwriter
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2 Answers

  1. Best Answer
    Expert

    The cause: I think this error happens because you are not informing the compiler that there is a possibility of throwing a FileNotFoundException .If  the file does not exist, a FileNotFoundException will be thrown.

    The solution: To solve this problem, you can try:

    public static void main(String[] args) throws FileNotFoundException {
    File file = new File ("file.txt");
    file.getParentFile().mkdirs();
    try
    {
        PrintWriter printWriter = new PrintWriter(file);
        printWriter.println ("hello");
        printWriter.close();
    }
    catch (FileNotFoundException ex)
    {
        // insert code to run when exception occurs
    }
}
    • 16

  2. This is a basic guide for those who are new to Java and want to learn PrintWriter. 

    import java.io.*;

public class SimpleFile {
 public static void main (String[] args) throws IOException {
 PrintWriter writeMe = new PrintWriter("newFIle.txt");
 writeMe.println("Just writing some text to print to your file ");
 writeMe.close();
 }
}
    • 5

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