Reading file from other class

Question

For the assignment, I created text files

and defined main class for the test

public static void main(String[] args)
{
    File input1 = new File("inputFile1.txt");
    File input2 = new File("inputFile2.txt");

    CalcCheck file1 = new CalcCheck(input1);
    CalcCheck file2 = new CalcCheck(input2);

    file1.CheckStart();
}

After I defined main class,

I defined other class

private File checkingFile;

CalcCheck (File files)
{
    checkingFile = files;
}

void CheckStart()
{
    Scanner sc = new Scanner (checkingFile);
    System.out.println("checking start");
    checkFileNull();
} ...

However, the Scanner sc = new Scanner (checkingFile) throws

FileNotFoundException

.

Can someone tell me what is the problem?

You're using a relative file path, and the error message is telling you that the file is not there. You could try using an absolute path, e.g. `C:\\path\\to\\inputFile1.txt`. — Tim Biegeleisen, Jun 15 '17 at 03:46
Do you actually have a file named "inputFile1.txt" and "inputFile2.txt" at the same package location of your class file? — Xu Lei, Jun 15 '17 at 03:49
@Xu Lei yes I put those class and txt file in the same folder — Konorika, Jun 15 '17 at 03:54

score 0 · Accepted Answer · answered Jun 15 '17 at 05:45

The constructor of Scan throws FileNotFoundException. This is actually a checked exception and you need to either surround the code with try ... catch ...

For example:

void CheckStart()
{
    Scanner sc;
    try {
        sc = new Scanner (checkingFile);
    } catch (FileNotFoundException e){
        e.printStackTrace();
    }
    System.out.println("checking start");
    checkFileNull();
}

Or you need to declare the exception in the method that calls the constructor. For example:

void CheckStart() throws FileNotFoundException
{
    Scanner sc = new Scanner (checkingFile);
    System.out.println("checking start");
    checkFileNull();
}

See this post for more information.

Reading file from other class

1 Answers1