public class Demo2 {public static void main(String[] args) {String s1 = "woaiheima,heimabutongyubaima,wulunheimahaishibaima,zhaodaogongzuojiushihaoma";String s2 = "heima";/*** indexof从0开始找，找到就索引后移一位，统计次数*/int index = 0, count = 0;while ((index = s1.indexOf(s2, index)) != -1) {index++;//找到一个，索引后移count++;//统计找到的次数}System.out.println("共出现:" + count + "次");}
}