Java hashmap 最大大小为 5770？
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Java hashmap max size of 5770?
提问by SirNickParks
I was testing some file/profile transferring things today. I used a HashMapto store a players name and the value of there profile. However I noticed my hashmap only goes up to 5770 in size. Why is this and how can I fix it?
我今天正在测试一些文件/配置文件传输的东西。我使用 aHashMap来存储玩家姓名和那里的个人资料值。但是我注意到我的哈希图的大小只增加到 5770。为什么会这样，我该如何解决？
HashMap<String, String> temp = new HashMap<String, String>();
for(String s : dataFile.getConfigurationSection("users").getKeys(false)) {
temp.put(s, dataFile.getString("users." + s + ".group"));
}
That's what i'm using to grab the player and their "group".
这就是我用来抓住玩家和他们的“组”的东西。
采纳答案by DanielM
HashMap is not limited, your problem is probably you have repeating keys..
HashMap 不受限制，您的问题可能是您有重复的键..
I would check if the key is contained already before putting it in the map:
在将其放入地图之前，我会检查密钥是否已包含：
if(temp.containsKey(s)){
System.out.println("Erasing key "+s+" val "+temp.get(s));
}
temp.put(s, dataFile.getString("users." + s + ".group"));
回答by Ankur Singhal
HashMap is not limited, provided to have a load factor is increased.
HashMap 没有限制，只要增加一个负载因子即可。
In Sun's JVM, HashMapuses an array which is a power of 2. The largest power of two allowed for an array size is 2^30. And the largest number of elements you can have before the HashMap will try to double its size to 2^31 (which it cannot do) is (2^30 * loadFactor) or about 700 million for the default load factor.
在 Sun 的 JVM 中，HashMap使用的数组是 2 的幂。数组大小所允许的最大 2 的幂是2^30。在 HashMap 尝试将其大小加倍到 2^31（它不能这样做）之前，您可以拥有的最大元素数量是 ( 2^30 * loadFactor) 或默认加载因子约为 7 亿。
