blocks|key|608223|text|Map<String,Integer>+map+=+new+HashMap<String,+Integer>(){{
put("cat",+2);
put("dog",+1);
put("llama",+0);
put("iguana",+-1);
}};|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|608224|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Map&lt;String,Integer&gt; map = new HashMap&lt;String, Integer&gt;(){{
put("cat", 2);
put("dog", 1);
put("llama", 0);
put("iguana", -1);
}};
</code></pre>

blocks|key|608289|text|咬紧牙关，键入地图名称！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|608290|++++Map<String,+Integer>+map+=+new+HashMap<String,+Integer>();
++++map.put("cat",+2);
++++map.put("dog",+1);
++++map.put("llama",+0);
++++map.put("iguana",+-1);|code-block|syntax|javascript|608291|您也可以这样做，这可能会省去一些长列表的输入：|608292|++++Object[][]+values+=+{
++++++++{"cat",+2},
++++++++{"dog",+1},
++++++++{"llama",+0},
++++++++{"iguana",+-1}
++++};

++++for+(Object[]+o+:+values)+{
++++++++map.put((String)+o[0],+(Integer)+o[1]);
++++}|608293|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Bite the bullet and type out the map name!

<pre><code> Map&lt;String, Integer&gt; map = new HashMap&lt;String, Integer&gt;();
 map.put("cat", 2);
 map.put("dog", 1);
 map.put("llama", 0);
 map.put("iguana", -1);
</code></pre>

You could also do something like this, which might save some typing with a long list:

<pre><code> Object[][] values = {
 {"cat", 2},
 {"dog", 1},
 {"llama", 0},
 {"iguana", -1}
 };

 for (Object[] o : values) {
 map.put((String) o[0], (Integer) o[1]);
 }
</code></pre>

blocks|key|823350|text|Java7几乎引入了允许这样语法的“集合文字”。他们可能会试着把它塞进Java8。我不知道这些人到底是怎么了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|823351|这可以通过某种包装器API轻松实现|823352|Map<String,Integer>+map+=+Maps.<String,Integer>empty()
++++.put("cat",+2).put("dog",1)....;+|code-block|syntax|javascript|823353|不算太坏。我更喜欢像这样的东西|823354|map("cat",+"dog",+...+)
.to(++1,+++++2,+++...+);|823355|这类事情肯定是由不同的人实现的，不幸的是，标准API没有包含这样的事情。|823356|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Java7 almost introduced "collection literals" that would allow syntax like that. They'll probably try to shove it in Java8. I have no idea what is wrong with these people.

This can be easily achieved by some kind of wrapper API

<pre><code>Map&lt;String,Integer&gt; map = Maps.&lt;String,Integer&gt;empty()
 .put("cat", 2).put("dog",1)....; 
</code></pre>

Not too bad. I would prefer something like

<pre><code>map("cat", "dog", ... )
.to( 1, 2, ... );
</code></pre>

This kind of thing must have been implemented by various people, unfortunately the standard API doesn't inculde such things.

blocks|key|608416|text|如果使用Guava+library，则可以单独使用其ImmutableMap类(示例1和2)，也可以将其用作HashMap的初始化器(示例3和4)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|608417|Map<String,+Integer>+map1+=+ImmutableMap.<String,+Integer>+builder()
++++.put("cat",+2)
++++.put("dog",+1)
++++.put("llama",+0)
++++.put("iguana",+-1)
++++.build();
Map<String,+Integer>+map2+=+ImmutableMap.of(
++++"cat",+2,
++++"dog",+1,
++++"llama",+0,
++++"iguana",+-1
);
Map<String,+Integer>+map3+=+Maps.newHashMap(
++++ImmutableMap.<String,+Integer>+builder()
++++.put("cat",+2)
++++.put("dog",+1)
++++.put("llama",+0)
++++.put("iguana",+-1)
++++.build()
);
Map<String,+Integer>+map4+=+Maps.newHashMap(+ImmutableMap.of(
++++"cat",+2,
++++"dog",+1,
++++"llama",+0,
++++"iguana",+-1)
);|code-block|syntax|javascript|608418|entityMap|0|LINK|mutability|MUTABLE|url|http://guava-libraries.googlecode.com/^0|Q|C|4|D|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If you use the <a href="http://guava-libraries.googlecode.com/" rel="nofollow">Guava library</a>, you can use its <code>ImmutableMap</code> class, either by itself (examples 1 and 2), or as an initializer for a HashMap (examples 3 and 4):

<pre><code>Map&lt;String, Integer&gt; map1 = ImmutableMap.&lt;String, Integer&gt; builder()
 .put("cat", 2)
 .put("dog", 1)
 .put("llama", 0)
 .put("iguana", -1)
 .build();
Map&lt;String, Integer&gt; map2 = ImmutableMap.of(
 "cat", 2,
 "dog", 1,
 "llama", 0,
 "iguana", -1
);
Map&lt;String, Integer&gt; map3 = Maps.newHashMap(
 ImmutableMap.&lt;String, Integer&gt; builder()
 .put("cat", 2)
 .put("dog", 1)
 .put("llama", 0)
 .put("iguana", -1)
 .build()
);
Map&lt;String, Integer&gt; map4 = Maps.newHashMap( ImmutableMap.of(
 "cat", 2,
 "dog", 1,
 "llama", 0,
 "iguana", -1)
);
</code></pre>

Is it possible in Java to make a Dictionary with the items already declared inside it? Just like the below C# code:

<pre><code> Dictionary&lt;string, int&gt; d = new Dictionary&lt;string, int&gt;()
 {
 {"cat", 2},
 {"dog", 1},
 {"llama", 0},
 {"iguana", -1}
 };
</code></pre>

How do I do this and what type do I use? I've read that Dictionary is obsolete.

C# to Java - Dictionaries?

Java

在Java中，是否可以创建一个包含已在其中声明的项的字典？就像下面的C#代码一样： Dictionary<string, int> d = new Dictionary<string, int>() { {"cat", 2}, {"dog", 1}, {"llama"...

问C#到Java -字典？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问C#到Java -字典？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问C#到Java -字典？
EN