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How to count an replace string in java

public static void main(String[] args) throws Exception {
        String word = "abcdefg";
        System.out.println(word.length());
        System.out.println(word.replace("a", "").length());
        int a_counter = word.length() - word.replace("a", "").length();
        System.out.println(a_counter);
}

Source: stackoverflow.com

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