import java.util.Scanner;
import java.util.Iterator;
import java.io.*;

public class Lines implements Iterator<String>, Iterable<String> {
    private Scanner scanner;
    public Lines(Scanner scanner) {
        this.scanner = scanner;
    }
    public boolean hasNext() {
        return scanner.hasNextLine();
    }
    public String next() {
        return scanner.nextLine();
    }
    public void remove() {
        throw new UnsupportedOperationException();
    }
    public Iterator<String> iterator() {
        return this;
    }
   
    public static void main(String[] args) {
        // Get filename and search string from stdin
        Scanner input = new Scanner(System.in);
        System.out.print("Enter filename      : ");
        String path = input.nextLine();
        System.out.print("Enter search string : ");
        String searchFor = input.nextLine();

        // Search every line in the file for the search string
        try {
            Scanner file = new Scanner(new File(path));
            for(String line : new Lines(file)) {
                if(line.contains(searchFor)) {
                    System.out.println(line);
                }
            }
        } catch(FileNotFoundException e) {
            System.out.println("Could not find " + path);
        }
    }
}