blocks|key|1498674|text|您的字符串键需要一个包装类，其中包含一个不区分大小写的equals()和hashCode()实现。使用它代替Map键的字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1498675|请看http://www.java.happycodings.com/Java_Util_Package/code3.html上的一个示例实现，我在谷歌上搜索了2分钟就找到了它。在我看来是明智的，尽管我从来没有用过它。|offset|length|1498676|entityMap|0|LINK|mutability|MUTABLE|url|http://www.java.happycodings.com/Java_Util_Package/code3.html^0|0|2|1P|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

You need a wrapper class for your String key with a case-insensitive equals() and hashCode() implementation. Use that instead of the String for the Map's key.

See an example implementation at <a href="http://www.java.happycodings.com/Java_Util_Package/code3.html" rel="nofollow noreferrer">http://www.java.happycodings.com/Java_Util_Package/code3.html</a> I found it in 2 minutes of googling. Looks sensible to me, though I've never used it.

blocks|key|1498691|text|您可以使用Apache中的CaseInsensitiveMap。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1498692|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/proper/commons-collections/javadocs/api-release/org/apache/commons/collections4/map/CaseInsensitiveMap.html^0|D|I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You could use <a href="http://commons.apache.org/proper/commons-collections/javadocs/api-release/org/apache/commons/collections4/map/CaseInsensitiveMap.html" rel="noreferrer">CaseInsensitiveMap</a> from Apache's Commons Collections.

blocks|key|1498707|text|是否有可能实现自己的Map覆盖put/get方法？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1498708|public+class+CaseInsensitiveMap+extends+HashMap<String,+String>+{
++++...
++++put(String+key,+String+value)+{
+++++++super.put(key.toLowerCase(),+value);
++++}

++++get(String+key)+{
+++++++super.get(key.toLowercase());
++++}
}|code-block|syntax|javascript|1498709|这种方法不会强迫你改变你的"key“类型，而是你的Map实现。|1498710|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Would it be possible to implement your own Map overriding put/get methods ?

<pre><code>public class CaseInsensitiveMap extends HashMap&lt;String, String&gt; {
 ...
 put(String key, String value) {
 super.put(key.toLowerCase(), value);
 }

 get(String key) {
 super.get(key.toLowercase());
 }
}
</code></pre>

This approach does not force you to change your "key" type but your Map implementation.

blocks|key|1713824|text|你可以使用我的Apache许可的CaseInsensitiveMap讨论的here。与Apache+Commons版本不同，它保留键的大小写。它比TreeMap更严格地实现了地图契约(而且具有更好的并发语义)(有关详细信息，请参阅博客评论)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1713825|entityMap|0|LINK|mutability|MUTABLE|url|https://src.springsource.org/svn/dm-server-util/main-branches/jersey/com.springsource.util.common/src/main/java/com/springsource/util/common/CaseInsensitiveMap.java|1|http://underlap.blogspot.com/2009/04/caseinsensitivemapv.html^0|G|I|0|11|4|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

You could use my Apache licensed <a href="https://src.springsource.org/svn/dm-server-util/main-branches/jersey/com.springsource.util.common/src/main/java/com/springsource/util/common/CaseInsensitiveMap.java" rel="nofollow noreferrer">CaseInsensitiveMap</a> discussed <a href="http://underlap.blogspot.com/2009/04/caseinsensitivemapv.html" rel="nofollow noreferrer">here</a>. Unlike the Apache Commons version, it preserves the case of keys. It implements the map contract more strictly than TreeMap (plus has better concurrent semantics) (see the blog comments for details).

blocks|key|1713851|text|Trove4j可以对HashMap使用自定义哈希。然而，这可能会影响性能，因为哈希码不能被缓存(尽管Trove4j可能已经找到了解决这个问题的方法？)。包装器对象(如John+M所描述的)没有这种缓存缺陷。另请参阅我关于TreeMap的另一个答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1713852|entityMap|0|LINK|mutability|MUTABLE|url|http://trove4j.sourceforge.net/html/overview.html^0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://trove4j.sourceforge.net/html/overview.html" rel="nofollow noreferrer">Trove4j</a> can use custom hashing for a HashMap. This may however have performance implications given that hashcodes cannot be cached (although Trove4j may have found a way around this?). Wrapper objects (as described by John M) do not have this caching deficiency. Also see my other answer regarding TreeMap.

blocks|key|1498809|text|TreeMap扩展了映射并支持自定义比较器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1498810|字符串提供了默认的不区分大小写的比较器。|1498811|所以：|1498812|final+Map<String,+...>+map+=+new+TreeMap<>(String.CASE_INSENSITIVE_ORDER);|code-block|syntax|javascript|1498813|比较器不考虑区域设置。在它的JavaDoc上阅读更多关于它的信息。|1498814|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

TreeMap extends Map and supports custom comparators.

String provides a default case insensitive comparator.

So:

<pre><code>final Map&lt;String, ...&gt; map = new TreeMap&lt;&gt;(String.CASE_INSENSITIVE_ORDER);
</code></pre>

The comparator does not take locale into account. Read more about it in its JavaDoc.

blocks|key|1713922|text|在下面的链接中检查接受的答案。How+to+check+for+key+in+a+Map+irrespective+of+the+case?|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1713923|最简单的解决方案是“在插入/检查前简单地将所有输入转换为大写(或小写)。您甚至可以编写自己的Map包装器来确保一致性。”|1713924|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3092710/how-to-check-for-key-in-a-map-irrespective-of-the-case^0|F|1J|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Check the accepted answer at the link below.
<a href="https://stackoverflow.com/questions/3092710/how-to-check-for-key-in-a-map-irrespective-of-the-case">How to check for key in a Map irrespective of the case?</a>

Bottom line is "The simplest solution is to simply convert all inputs to uppercase (or lowercase) before inserting/checking. You could even write your own Map wrapper that would do this to ensure consistency."

Is there a good way to have a <code>Map&lt;String, ?&gt;</code> get and put ignoring case?

Is there a good way to have a Map<String, ?> get and put ignoring case?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有一个很好的方法来让Map<String, ?>获取和放置忽略的情况？

问有没有一个好的方法来实现一个Map<String，?> get和put忽略的情况？
EN

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问有没有一个好的方法来实现一个Map<String，?> get和put忽略的情况？EN