Not satisfied with last condition

public class Solution {
    static boolean debug = true; //this line under solution

    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String[] array = {"Task", "Enter", "twenty", "words", "from", "the", "keyboard", "and", "Display", "them",
                "In", "alphabetical", "order", "Each", "word", "Should", "be", "on", "new", "line"}; // this line

        if(!debug) { //this
            array = new String[20];
            for (int i = 0; i < array.length; i++) {
                array[i] = reader.readLine();
            }
        }

        sort(array);

        for (String x : array) {
            System.out.println(x);
        }
    }

    public static void sort(String[] array) {
        //write your code here
        String s = "";
        for (int i = array.length -1; i > 0; i--) {
            for (int j = 1; j < i; j++) {
                if (isGreaterThan(array[j-1], array[j])) {
                    s = array[j];
                    array[j] = array[j-1];
                    array[j-1] = s;
                }
            }
        }
    }

    // String comparison method: 'a' is greater than 'b'
    public static boolean isGreaterThan(String a, String b) {
        return a.compareTo(b) > 0;
    }
}