Scanner with unknown lines of input

I have issue letting my program know when I'm done supplying input using Scanner. The following code works for a single paragraph after I supply the input and press enter twice in my IDE terminal.

            Scanner scanner = new Scanner(System.in);
            ArrayList<String> als = new ArrayList<>();
            while(scanner.hasNextLine()){
                String s = scanner.nextLine();
                if(s.equals("")) break; 
                als.add(s);
            }
            scanner.close();
            for(String ss : als) System.out.println(ss);

I would however like to supply multiple paragraphs of input ie.

word word word word
word word word word

word word word word
word word word word

and store them all in the arraylist then print it.

> I suppose when there are only empty lines coming through. Is there a way to make it stop after two lines of ""?

In that case, you can add a boolean variable that indicates whether the last line is empty:

    Scanner scanner = new Scanner(System.in);
    ArrayList<String> als = new ArrayList<>();
    boolean lastLineIsEmpty = false;
    while(scanner.hasNextLine()){
        String s = scanner.nextLine();
        if(s.equals("")) { // this line is empty
            if (lastLineIsEmpty) { // last line is also empty
                break;
            } else { // last line is not empty, set the variable to true
                lastLineIsEmpty = true;
            }
        } else { // this line is not empty, reset the variable
            lastLineIsEmpty = false;
        }
        als.add(s);
    }
    for(String ss : als) System.out.println(ss);

If you want it to stop after N lines of "", you can instead use an int variable, that counts how many consecutive empty lines the scanner has seen.

You wrote in your comment to your question:

> Is there a way to make it stop after two lines of ""?

Just add a counter that counts the number of consecutive blank lines entered. Once the counter is greater than one, you have reached the end of the input.

import java.util.ArrayList;
import java.util.Scanner;

public class Paragraf {

    public static void main(String[] args) {

        @SuppressWarnings("resource")
        Scanner scanner = new Scanner(System.in);

        ArrayList<String> als = new ArrayList<>();
        int count = 0;
        while (scanner.hasNextLine()) {
            String s = scanner.nextLine();
            if (s.isEmpty()) {
                count++;
                if (count > 1) {
                    break;
                }
            }
            else {
                count = 0;
            }
            als.add(s);
        }
        als.forEach(System.out::println);
    }
}

By the way, you should not close a Scanner that wraps System.in.