To solve a problem asked by @escmum: https://twitter.com/escmum/status/571658018766635008

UserInput.java

class UserInput {
    public static void main(String[] args) {
        // Create a two dimensional array to hold user input. Using
        // a boolean because we only care about there being
        // "user input" present or not.
        boolean[][] inputs = new boolean[18][28];

        // Set some values to show where user input has been triggered.
        inputs[1][17] = true;
        inputs[5][4] = true;
        inputs[16][18] = true;

        for (boolean[] row : inputs) {
            for (boolean column : row) {
                if (column == true) {
                    System.out.print(1);
                } else {
                    System.out.print(0);
                }
            }

            // Add a line break after printing every row.
            System.out.println("");
        }
    }
}