Java子字符串每个关闭的html标记上都有一个字符串

public class SubstringExample {
    public static void main(String[] args) {
        String htmlString = "<p>This is a <b>sample</b> HTML string.</p>";
        
        int startIndex = htmlString.indexOf("<");
        int endIndex = htmlString.lastIndexOf(">");
        
        if (startIndex != -1 && endIndex != -1 && startIndex < endIndex) {
            String substring = htmlString.substring(startIndex, endIndex + 1);
            System.out.println("Substring: " + substring);
        } else {
            System.out.println("No HTML tag found.");
        }
    }
}

Substring: <p>