用两种不同的方法统计一个子串在字符串中出现的次数。 任务描述:设字符串为"nbaernbatnbaynbauinbaopnba",子串为:"nba"。统计子串在字符串中的出现次数。 要求: 1、自定义方法 public static int subStrCount(String s1,String s2) { } 完成上述功能; 2、在subStrCount方法中调用String类提供的方法完成题目要求的功能。(试采用2种不同的方法完成)
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