Java の例 - ラベル

/*
 author by w3cschool.cc
 Main.java
 */public class Main {
   public static void main(String[] args) {
      String strSearch = "This is the string in which you have to search for a substring.";
      String substring = "substring";
      boolean found = false;
      int max = strSearch.length() - substring.length();
      testlbl:
      for (int i = 0; i <= max; i++) {
         int length = substring.length();
         int j = i;
         int k = 0;
         while (length-- != 0) {
            if(strSearch.charAt(j++) != substring.charAt(k++)){
               continue testlbl;
            }
         }
         found = true;
         break testlbl;
      }
      if (found) {
         System.out.println("发现子字符串。");
      }
      else {
         System.out.println("字符串中没有发现子字符串。");
      }
   }}

发现子字符串。