在java中创建包级关联数组

import java.util.HashMap;

public class PackageLevelHashMap {
    private static final HashMap<String, String> ASSOCIATIVE_ARRAY = new HashMap<>();

    static {
        ASSOCIATIVE_ARRAY.put("key1", "value1");
        ASSOCIATIVE_ARRAY.put("key2", "value2");
        ASSOCIATIVE_ARRAY.put("key3", "value3");
    }

    public static void main(String[] args) {
        System.out.println("Value of key1: " + ASSOCIATIVE_ARRAY.get("key1"));
        System.out.println("Value of key2: " + ASSOCIATIVE_ARRAY.get("key2"));
        System.out.println("Value of key3: " + ASSOCIATIVE_ARRAY.get("key3"));
    }
}