Jak najít konkrétní znak v řetězci pomocí pole

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jak najít konkrétní znak v řetězci pomocí pole

    public static void main(String[] args) {
        String url = "[email protected]";
        char key = '@';

        char[] ch = url.toCharArray();

        for (int i = 0; i < ch.length; i++) {
            if (key == ch[i]) {
                System.out.println(key + " is in index: "+i);
            }
        }
    }

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