How to write the code that extract email address from a text file

someone@somewhere.net

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class EmailidExtration {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
 
        Pattern pattern = Pattern.compile("([a-z0-9_.-]+)@([a-z0-9_.-]+[a-z])");
        Matcher matcher = pattern.matcher("emailtext.txt");
 
        while(matcher.find()){
            System.out.println(matcher.group());
        }
    }
}