java - 如何初始化哈希表

Question

如何初始化以下哈希表？

public static Hashtable<String, Hashtable<String, String>> tab = new Hashtable<String, Hashtable<String, String>>();    
static {
    tab.put("Key1", ????);
    tab.put("Key2", ????);
    tab.put("Key3", ????);
}

Answer 1

public static Hashtable<String, Hashtable<String, String>> tab = new Hashtable<String, Hashtable<String, String>>();    
static {
    tab.put("Key1", new HashTable<String,String>());
    ...
}