Day 09 string A

public class Day09A {
    public static void main(String[] args) {
        String txtSource = "The quick brown fox jumps the lazy dog.";
        int currentIndex = 0;

        System.out.println("current source: " + txtSource);
        currentIndex = txtSource.toLowerCase().indexOf("the");
        System.out.println("find index of \"the\": " + currentIndex);
//        txtSource = txtSource.toLowerCase();
        currentIndex = txtSource.toLowerCase().indexOf("the",currentIndex+1);
        System.out.println("find index of \"the\": " + currentIndex);

        txtSource = "She sells sea shells by the sea shore. The shells she sells are surely sea shells. So if she sells shells on the sea shore, I'm sure she sells seashore shells.";

        System.out.println("current source: " + txtSource);
        int sourceLen = txtSource.length();
        currentIndex = 0;
        int count = 0;

        while (count < sourceLen) {
            System.out.print("the word sea is on index ");
            currentIndex = txtSource.toLowerCase().indexOf("sea", count);
            System.out.println(currentIndex);
            count++;
        }

    }
}