如何将map转换为字符串？

import java.util.HashMap;
import java.util.Map;

public class MapToStringExample {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("key1", "value1");
        map.put("key2", "value2");
        map.put("key3", "value3");

        StringBuilder sb = new StringBuilder();
        for (Map.Entry<String, String> entry : map.entrySet()) {
            sb.append(entry.getKey()).append(":").append(entry.getValue()).append(",");
        }

        // 移除最后一个逗号
        if (sb.length() > 0) {
            sb.setLength(sb.length() - 1);
        }

        String result = sb.toString();
        System.out.println(result);
    }
}