文本中寻找某一单词出现次数

 1 public class Temp {
 2 
 3     public static void main(String[] args) {
 4         String s = "frgjavajjavajjavahhjavajavajjjjavahjavahjavajava";
 5         
 6 //        StringBuffer sb = new StringBuffer();
 7 //        String[] str = s.split("java");
 8 //        for (int i = 0; i < str.length; i++) {
 9 //            if (str[i] != " ") {
10 //                sb.append(str[i]);
11 //            }
12 //        }
13 //        System.out.println((s.length() - sb.length()) / 4);
14         
15         int n = 0;
16         int i=0;
17         while (s.length() > 5) {
18             i = s.indexOf("java");
19             n++;
20             s = s.substring(i + 4);
21         }
22         if (s.contains("java")) {
23             n++;
24         }
25         System.out.println(n);
26     }
27 
28 }