FileOutputStream不显示FileNotFoundException

Question

for FileOutputStream , it will throw a FileNotFoundException if the file doesn't exist, but it will create it if it can.

I dont have a Sample.txt in my project root

import java.io.FileNotFoundException;
import java.io.FileOutputStream;

public class Main {
    public static void main(String[] args)  {
        try {
            FileOutputStream s=  new FileOutputStream("Sample.txt");
        } catch (FileNotFoundException e) {
            System.out.println("File not Found");
        }
    }
}

The problem is:

• I cannot see the Output of the "File Not Found" from the Terminal . How did it happen?

Thank you

Answer 1

You can set Sample.txt as a File first and check if it exists with .canWrite()

You still have to put a try/catch around FileOutputStream, but it should never go in the catch block.

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

public class test {

    public static void main(String[] args) {
        File f = new File("Sample.txt");
        if (!f.exists()) {
            System.out.println("File not Found");
        }
        else {
            try {
                FileOutputStream s = new FileOutputStream(f);
            } catch (FileNotFoundException e) {}
        }
    }
}