"ngbnbajhjnnbakygdnba"中关键字"nba"出现的次数

根据提供的代码，关键字"nba"在字符串"ngbnbajhjnnbakygdnba"中出现的次数可以通过统计函数中的while循环来实现。参考和中的代码，可以编写一个方法来统计关键字出现的次数。下面是一个示例代码：

public static int countKeyword(String str, String keyword) {
    int count = 0;
    int index = 0;
    while((index = str.indexOf(keyword, index)) != -1) {
        count++;
        index = index + keyword.length();
    }
    return count;
}

public static void main(String[] args) {
    String str = "ngbnbajhjnnbakygdnba";
    String keyword = "nba";
    int count = countKeyword(str, keyword);
    System.out.println("关键字出现的次数为：" + count);
}

以上代码会输出"关键字出现的次数为：3"，表示关键字"nba"在字符串"ngbnbajhjnnbakygdnba"中出现了3次。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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