java hashmap 键集自动排序
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hashmap keyset automatically sorted
提问by Jochem Gruter
HashMap<String, String[]> content = new HashMap<String, String[]>();
content.put("Help", new String[]{"About"});
content.put("View", new String[]{"Grid"});
content.put("File", new String[]{"Import", "Export"});
for(String key : content.keySet()){
System.out.println(key);
}
The above code logs:
上面的代码日志：
View
Help
File
But why is this sorted?
但为什么要这样排序？
回答by Boris Mocialov
回答by NINCOMPOOP
The order in which you see the entries in the HashMapdepends on the hash codes of the keys and order of the entries in the bucket I believe and it is implementation dependent, but don't rely on HashMapfor ordering at all. Whereas LinkedHashMapand TreeMapdo guarantee a certain order.
您在 中看到条目的顺序HashMap取决于键的哈希码和存储桶中条目的顺序，我相信它取决于实现，但根本不依赖于HashMap排序。而LinkedHashMap并TreeMap确实保证一定的顺序。
