java中的标签大多是为循环设计的，是为了在多重循环中方便break和coutinue的使用。

示例：在循环中跳到指定的标签处

完整代码

public class Main {public static void main(String[] args) {String strSearch = "My name is zsh.";String substring = "zsh";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。");}}
}

结果输出

发现子字符串。