如何访问嵌套的Hashmap

import java.util.HashMap;

public class NestedHashMapExample {
    public static void main(String[] args) {
        // 创建外层HashMap
        HashMap<String, HashMap<String, String>> outerMap = new HashMap<>();

        // 创建内层HashMap
        HashMap<String, String> innerMap = new HashMap<>();
        innerMap.put("key1", "value1");
        innerMap.put("key2", "value2");

        // 将内层HashMap作为值存储到外层HashMap中
        outerMap.put("outerKey", innerMap);

        // 访问嵌套的HashMap
        String value = outerMap.get("outerKey").get("key1");
        System.out.println("Value: " + value);
    }
}