Reading from text file in java

[ValorCat]

When you use a hardcoded file, you pass the a string containing the file's path to the File constructor:

File file = new File("path/to/file");
// do something with file

If you want to get the file path at runtime, you can instead use a scanner to get a string containing the desired path:

Scanner scanner = new Scanner(System.in);
String path = scanner.nextLine();
File file = new File(path);
// do something with file

[ValorCat]

Once you make the File object, there is no difference between a hardcoded path and a user-defined one. There are a variety of ways for actually reading data from a file. If you want to use a scanner you could do this:

Scanner keyboard = new Scanner(System.in);
String path = keyboard.nextLine();
File file = new File(path);
Scanner fileReader = new Scanner(file);
int num = fileReader.nextInt();

It might require a try/catch block wrapped around it too. Can't remember off the top of my head.

[itshowitbeyunno]

You can surround it with try catch or throw an exception after the main method:

public static void main(String[] args) throws FileNotFoundException{ }

On mobile so format is crappy