blocks|key|118593|text|IntStream::boxed|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|118594|IntStream::boxed将IntStream转换为Stream，然后您可以将其collect为List|118595|theIntStream.boxed().collect(Collectors.toList())|code-block|syntax|javascript|118596|boxed方法将IntStream的int原始值转换为Integer对象流。单词"boxing"将int+Integer⬌转换过程命名为。参见Oracle+Tutorial。|118597|Java+16和更高版本|118598|Java16带来了更短的toList方法。生成unmodifiable+list。讨论了here。|118599|theIntStream.boxed().toList()+|118600|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/IntStream.html#boxed()|1|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/IntStream.html|2|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/Stream.html|3|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/Stream.html#collect(java.util.stream.Collector)|4|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html|5|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Integer.html|6|https://en.wikipedia.org/wiki/Object_type_(object-oriented_programming)#Boxing|7|https://docs.oracle.com/javase/tutorial/java/data/autoboxing.html|8|https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/stream/Stream.html#toList()|9|https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/List.html#unmodifiable|10|https://todd.ginsberg.com/post/java-16/stream-tolist/^0|0|G|0|0|G|H|9|T|6|17|7|1F|4|0|G|0|H|9|1|T|6|2|17|7|3|1F|4|4|0|0|0|5|8|9|I|3|R|7|1D|3|1H|7|R|7|5|14|8|6|1Z|F|7|0|0|C|6|C|6|8|N|H|9|18|4|A|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1P|8|@$9|1Q|A|1R|B|C]|$9|1S|A|1T|B|C]|$9|1U|A|1V|B|C]|$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]]|D|@$9|20|A|21|1|22]|$9|23|A|24|1|25]|$9|26|A|27|1|28]|$9|29|A|2A|1|2B]|$9|2C|A|2D|1|2E]]|E|$]]|$1|H|3|I|5|J|7|2F|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|2G|8|@$9|2H|A|2I|B|C]|$9|2J|A|2K|B|C]|$9|2L|A|2M|B|C]|$9|2N|A|2O|B|C]|$9|2P|A|2Q|B|C]|$9|2R|A|2S|B|C]]|D|@$9|2T|A|2U|1|2V]|$9|2W|A|2X|1|2Y]|$9|2Z|A|30|1|31]]|E|$]]|$1|O|3|P|5|6|7|32|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|33|8|@$9|34|A|35|B|C]]|D|@$9|36|A|37|1|38]|$9|39|A|3A|1|3B]|$9|3C|A|3D|1|3E]]|E|$]]|$1|S|3|T|5|J|7|3F|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|3G|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]|14|$5|X|Y|Z|E|$10|15]]|16|$5|X|Y|Z|E|$10|17]]|18|$5|X|Y|Z|E|$10|19]]|1A|$5|X|Y|Z|E|$10|1B]]|1C|$5|X|Y|Z|E|$10|1D]]|1E|$5|X|Y|Z|E|$10|1F]]|1G|$5|X|Y|Z|E|$10|1H]]|1I|$5|X|Y|Z|E|$10|1J]]|1K|$5|X|Y|Z|E|$10|1L]]]]

<h1><code>IntStream::boxed</code></h1>
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/IntStream.html#boxed()" rel="noreferrer"><code>IntStream::boxed</code></a> turns an <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/IntStream.html" rel="noreferrer"><code>IntStream</code></a> into a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/Stream.html" rel="noreferrer"><code>Stream&lt;Integer&gt;</code></a>, which you can then <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/Stream.html#collect(java.util.stream.Collector)" rel="noreferrer"><code>collect</code></a> into a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html" rel="noreferrer"><code>List</code></a>:
<pre><code>theIntStream.boxed().collect(Collectors.toList())
</code></pre>
The <code>boxed</code> method converts the <code>int</code> primitive values of an <code>IntStream</code> into a stream of <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Integer.html" rel="noreferrer"><code>Integer</code></a> objects. The word <a href="https://en.wikipedia.org/wiki/Object_type_(object-oriented_programming)#Boxing" rel="noreferrer">&quot;boxing&quot;</a> names the <code>int</code> ⬌ <code>Integer</code> conversion process. See <a href="https://docs.oracle.com/javase/tutorial/java/data/autoboxing.html" rel="noreferrer">Oracle Tutorial</a>.
<h2>Java 16 and later</h2>
Java 16 brought the shorter <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/stream/Stream.html#toList()" rel="noreferrer"><code>toList</code></a> method. Produces an <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/List.html#unmodifiable" rel="noreferrer">unmodifiable list</a>. Discussed <a href="https://todd.ginsberg.com/post/java-16/stream-tolist/" rel="noreferrer">here</a>.
<pre><code>theIntStream.boxed().toList() 
</code></pre>

blocks|key|4624528|text|您还可以在流上使用mapToObj()，它接受一个IntFunction并返回一个对象值流，其中包含将给定函数应用于该流的元素的结果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4624529|List<Integer>+intList+=+myIntStream.mapToObj(i->i).collect(Collectors.toList());|code-block|syntax|javascript|4624530|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could also use mapToObj() on a Stream, which takes an IntFunction and returns an object-valued Stream consisting of the results of applying the given function to the elements of this stream.

<pre><code>List&lt;Integer&gt; intList = myIntStream.mapToObj(i-&gt;i).collect(Collectors.toList());
</code></pre>

blocks|key|118629|text|您可以使用Eclipse+Collections中提供的基元集合，并避免装箱。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|118630|MutableIntList+list+=+
++++IntStream.range(1,+5)
++++.collect(IntArrayList::new,+MutableIntList::add,+MutableIntList::addAll);|code-block|syntax|javascript|118631|注意:我是Eclipse+Collections的贡献者。|118632|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eclipse.org/collections/^0|5|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You can use primitive collections available in <a href="http://www.eclipse.org/collections/" rel="noreferrer">Eclipse Collections</a> and avoid boxing.

<pre><code>MutableIntList list = 
 IntStream.range(1, 5)
 .collect(IntArrayList::new, MutableIntList::add, MutableIntList::addAll);
</code></pre>

Note: I am a contributor to Eclipse Collections.

blocks|key|4624585|text|您可以使用collect方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4624586|IntStream.of(1,+2,+3).collect(ArrayList::new,+List::add,+List::addAll);|code-block|syntax|javascript|4624587|事实上，当您在对象流上调用.collect(Collectors.toList())时，这几乎就是Java正在做的事情：|4624588|public+static+<T>+Collector<T,+?,+List<T>>+toList()+{
++++return+new+Collectors.CollectorImpl(ArrayList::new,+List::add,+(var0,+var1)+->+{
++++++++var0.addAll(var1);
++++++++return+var0;
++++},+CH_ID);
}|4624589|注意:只有当您想要运行并行收集时，才需要第三个参数；对于顺序收集，只提供前两个参数就足够了。|4624590|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can use the collect method:

<pre><code>IntStream.of(1, 2, 3).collect(ArrayList::new, List::add, List::addAll);
</code></pre>

In fact, this is almost exactly what Java is doing when you call .collect(Collectors.toList()) on an object stream:

<pre><code>public static &lt;T&gt; Collector&lt;T, ?, List&lt;T&gt;&gt; toList() {
 return new Collectors.CollectorImpl(ArrayList::new, List::add, (var0, var1) -&gt; {
 var0.addAll(var1);
 return var0;
 }, CH_ID);
}
</code></pre>

Note: The third parameter is only required if you want to run parallel collection; for sequential collection providing just the first two will suffice.

blocks|key|4624548|text|找到使用Java+8查找每个int元素的平方的以下示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4624549|IntStream+ints+=+Arrays.stream(new+int[]+{1,2,3,4,5});+++++++
List<Integer>+intsList+=+ints.map(x->+x*x)
++++++++++.collect(ArrayList<Integer>::new,+ArrayList::add,+ArrayList::addAll);|code-block|syntax|javascript|4624550|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Find the folowing example of finding square of each int element using Java 8 :-

<pre><code>IntStream ints = Arrays.stream(new int[] {1,2,3,4,5}); 
List&lt;Integer&gt; intsList = ints.map(x-&gt; x*x)
 .collect(ArrayList&lt;Integer&gt;::new, ArrayList::add, ArrayList::addAll);
</code></pre>

I'm looking at the docs for the <code>IntStream</code>, and I see an <code>toArray</code> method, but no way to go directly to a <code>List&lt;Integer&gt;</code>

Surely there is a way to convert a <code>Stream</code> to a <code>List</code>?

How do I convert a Java 8 IntStream to a List?

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我正在查看IntStream的文档，我看到了一个toArray方法，但没有办法直接转到List<Integer>当然，有一种方法可以将Stream转换为List

问如何将Java8 IntStream转换为列表？
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