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import cn.hutool.core.date.DateUtil;

Let me structure the guide accordingly, making sure each new feature is explained with context and examples. Also, highlight the benefits these features bring to developers.

import cn.hutool.http.HttpUtil;

Troubleshooting: Common errors when using new features and how to fix them.

This is a hypothetical example if they added a parseIso8601 method.

First section: Introduction. Briefly explain what Hutool is and why it's useful. Then mention the key updates in version 3.9.

Date date = DateUtil.parseIso8601("2023-10-10T12:30:45Z"); System.out.println(DateUtil.format(date, "yyyy-MM-dd HH:mm:ss"));

Map<String, Object> map = new HashMap<>(); map.put("user.name", "Alice"); map.put("user.age", 30);

I need to ensure the language is clear, avoiding overly technical jargon but still precise enough for developers. Structure each section with headings for readability.

Wait, the user might not have specific information on what's new, so I should generalize based on Hutool's known capabilities. Maybe check official docs if available. Since I can't access them, I'll have to make educated guesses based on typical Java utility enhancements.

import cn.hutool.core.io.FileUtil;

Need to ensure the examples are syntactically correct. For instance, using the new DateUtil method:

Another example: Enhanced File reading with new methods in FileUtil that read all lines and filter them, or write lines with encoding specified.

import cn.hutool.json.JSONObject;

Examples are crucial. For each new feature, a short code example. Make sure the code is correct and shows practical applications. For instance, using a new method in BeanUtils to convert a Map to a Bean with nested properties.