FileNotFoundException: Thrown when an attempt to open the file denoted by a specified pathname has failed.
Example:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
try {
 File file = new File("nonexistent.txt");
 Scanner sc = new Scanner(file);
} catch (FileNotFoundException e) {
 System.out.println("Caught FileNotFoundException: " + e.getMessage());
}