blocks|key|920920|text|Guava还提供了与Python的range类似的功能|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|920921|Range.closed(1,+5).asSet(DiscreteDomains.integers());|code-block|syntax|javascript|920922|您还可以使用Guava的AbstractIterator实现一个相当简单的迭代器来做同样的事情：|920923|return+new+AbstractIterator<Integer>()+{
++int+next+=+getStart();

++@Override+protected+Integer+computeNext()+{
++++if+(isBeyondEnd(next))+{
++++++return+endOfData();
++++}
++++Integer+result+=+next;
++++next+=+next+%2B+getStep();
++++return+result;
++}
};|920924|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/guava-libraries/^0|H|5|0|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

<a href="http://code.google.com/p/guava-libraries/">Guava</a> also provides something similar to Python's <code>range</code>:

<pre><code>Range.closed(1, 5).asSet(DiscreteDomains.integers());
</code></pre>

You can also implement a fairly simple iterator to do the same sort of thing using Guava's AbstractIterator:

<pre><code>return new AbstractIterator&lt;Integer&gt;() {
 int next = getStart();

 @Override protected Integer computeNext() {
 if (isBeyondEnd(next)) {
 return endOfData();
 }
 Integer result = next;
 next = next + getStep();
 return result;
 }
};
</code></pre>

blocks|key|1135641|text|旧问题，新答案(针对Java+8)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1135642|IntStream.range(0,+10).forEach(n+->+System.out.println(n));|code-block|syntax|javascript|1135643|或者使用方法引用：|1135644|IntStream.range(0,+10).forEach(System.out::println);|1135645|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|$]]

Old question, new answer (for Java 8)
<pre><code>IntStream.range(0, 10).forEach(n -&gt; System.out.println(n));
</code></pre>
or with method references:
<pre><code>IntStream.range(0, 10).forEach(System.out::println);
</code></pre>

blocks|key|1135418|text|我正在开发一个名为Jools的小Java+utils库，它包含一个类Range，它提供了您需要的功能(有一个可下载的JAR)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1135419|构造函数可以是Range(int+stop)、Range(int+start,+int+stop)或Range(int+start,+int+stop,+int+step)+(类似于for循环)，您可以遍历它(使用惰性计算)，也可以使用它的toList()方法显式地获取范围列表。|1135420|for+(int+i+:+new+Range(10))+{...}+//+i+=+0,1,2,3,4,5,6,7,8,9

for+(int+i+:+new+Range(4,10))+{...}+//+i+=+4,5,6,7,8,9

for+(int+i+:+new+Range(0,10,2))+{...}+//+i+=+0,2,4,6,8

Range+range+=+new+Range(0,10,2);
range.toList();+//+[0,2,4,6,8]|code-block|syntax|javascript|1135421|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Nurdok/Jools^0|Y|5|9|5|0|0|7|F|N|Q|1E|10|3C|8|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

I'm working on a little Java utils library called <a href="https://github.com/Nurdok/Jools">Jools</a>, and it contains a class <code>Range</code> which provides the functionality you need (there's a downloadable JAR). 
Constructors are either <code>Range(int stop)</code>, <code>Range(int start, int stop)</code>, or <code>Range(int start, int stop, int step)</code> (similiar to a for loop) and you can either iterate through it, which used lazy evaluation, or you can use its <code>toList()</code> method to explicitly get the range list.

<pre><code>for (int i : new Range(10)) {...} // i = 0,1,2,3,4,5,6,7,8,9

for (int i : new Range(4,10)) {...} // i = 4,5,6,7,8,9

for (int i : new Range(0,10,2)) {...} // i = 0,2,4,6,8

Range range = new Range(0,10,2);
range.toList(); // [0,2,4,6,8]
</code></pre>

blocks|key|921033|text|从Guava+15.0开始，Range.asSet()已被弃用，并计划在版本16中删除。请改用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|921034|ContiguousSet.create(Range.closed(1,+5),+DiscreteDomain.integers());|code-block|syntax|javascript|921035|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/Range.html#asSet%2528com.google.common.collect.DiscreteDomain%2529^0|E|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Since Guava 15.0, <a href="http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/Range.html#asSet%28com.google.common.collect.DiscreteDomain%29" rel="noreferrer">Range.asSet()</a> has been deprecated and is scheduled to be removed in version 16. Use the following instead:

<pre><code>ContiguousSet.create(Range.closed(1, 5), DiscreteDomain.integers());
</code></pre>

blocks|key|1135336|text|public+int[]+range(int+start,+int+stop)
{
+++int[]+result+=+new+int[stop-start];

+++for(int+i=0;i<stop-start;i%2B%2B)
++++++result[i]+=+start%2Bi;

+++return+result;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1135337|请原谅任何语法或风格错误；我通常用C#编程。|unstyled|1135338|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>public int[] range(int start, int stop)
{
 int[] result = new int[stop-start];

 for(int i=0;i&lt;stop-start;i++)
 result[i] = start+i;

 return result;
}
</code></pre>

Forgive any syntax or style errors; I normally program in C#.

blocks|key|921163|text|您可以使用以下代码片段来获取整数的范围集：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|921164|++++Set<Integer>+iset+=+IntStream.rangeClosed(1,+5).boxed().collect
++++++++++++(Collectors.toSet());|code-block|syntax|javascript|921165|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 can use the following code snippet in order to get a range set of integers:

<pre><code> Set&lt;Integer&gt; iset = IntStream.rangeClosed(1, 5).boxed().collect
 (Collectors.toSet());
</code></pre>

blocks|key|1135304|text|public+int[]+range(int+start,+int+length)+{
++++int[]+range+=+new+int[length+-+start+%2B+1];
++++for+(int+i+=+start;+i+<=+length;+i%2B%2B)+{
++++++++range[i+-+start]+=+i;
++++}
++++return+range;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1135305|(长长的回答只是说“不”)|unstyled|1135306|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>public int[] range(int start, int length) {
 int[] range = new int[length - start + 1];
 for (int i = start; i &lt;= length; i++) {
 range[i - start] = i;
 }
 return range;
}
</code></pre>

(Long answer just to say "No")

blocks|key|1135738|text|Java9-+IntStream::iterate|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1135739|从Java9开始，您可以使用IntStream::iterate，甚至可以自定义步骤。例如，如果您想要int数组：|1135740|public+static+int[]+getInRange(final+int+min,+final+int+max,+final+int+step)+{
++++return+IntStream.iterate(min,+i+->+i+<+max,+i+->+i+%2B+step)
++++++++++++.toArray();
}|code-block|syntax|javascript|1135741|或List：|1135742|public+static+List<Integer>+getInRange(final+int+min,+final+int+max,+final+int+step)+{
++++return+IntStream.iterate(min,+i+->+i+<+max,+i+->+i+%2B+step)
++++++++++++.boxed()
++++++++++++.collect(Collectors.toList());
}|1135743|然后使用它：|1135744|int[]+range+=+getInRange(0,+10,+1);|1135745|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/IntStream.html#iterate(int,java.util.function.IntPredicate,java.util.function.IntUnaryOperator)^0|7|I|7|I|0|0|E|I|1F|3|0|0|1|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]]|E|$]]|$1|F|3|G|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1I|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

<h1>Java 9 - <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/stream/IntStream.html#iterate(int,java.util.function.IntPredicate,java.util.function.IntUnaryOperator)" rel="nofollow noreferrer"><code>IntStream::iterate</code></a></h1>
Since Java 9 you can use <code>IntStream::iterate</code> and you can even customize the step. For example if you want <code>int</code> array :
<pre><code>public static int[] getInRange(final int min, final int max, final int step) {
 return IntStream.iterate(min, i -&gt; i &lt; max, i -&gt; i + step)
 .toArray();
}
</code></pre>
or <code>List</code> :
<pre><code>public static List&lt;Integer&gt; getInRange(final int min, final int max, final int step) {
 return IntStream.iterate(min, i -&gt; i &lt; max, i -&gt; i + step)
 .boxed()
 .collect(Collectors.toList());
}
</code></pre>
And then use it :
<pre><code>int[] range = getInRange(0, 10, 1);
</code></pre>

blocks|key|921223|text|IntStream.range(0,+10).boxed().collect(Collectors.toUnmodifiableList());|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|921224|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 class="lang-java prettyprint-override"><code>IntStream.range(0, 10).boxed().collect(Collectors.toUnmodifiableList());
</code></pre>

blocks|key|920962|text|groovy的漂亮的Range+class可以在Java中使用，尽管它肯定不是那么好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|920963|entityMap|0|LINK|mutability|MUTABLE|url|http://groovy.codehaus.org/Collections#Collections-Ranges^0|A|B|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]]]]

Groovy's nifty <a href="http://groovy.codehaus.org/Collections#Collections-Ranges" rel="nofollow">Range class</a> can be used from Java, though it's certainly not as groovy.

blocks|key|920830|text|如果您打算像在Python循环中那样使用它，那么Java可以通过for语句很好地循环，这样就不需要使用这个结构了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|920831|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you mean to use it like you would in a Python loop, Java loops nicely with the for statement, which renders this structure unnecessary for that purpose.

blocks|key|921252|text|Java+8|type|unstyled|depth|inlineStyleRanges|entityRanges|data|921253|private+static+int[]+range(int+start,+int+stop,+int+step)+{
++++int[]+result+=+new+int[(stop-start)%25step+==+0+?+(stop-start)/step+:+(stop-start)/step%2B1];
++++int+count+=+0;
++++Function<Integer,+Boolean>+condition+=+step+>+0+?+(x)+->+x+<+stop+:+(x)+->+x+>+stop;
++++for+(int+i+=+start;+condition.apply(i);+i+%2B=+step)+{
++++++++result[count]+=+i;
++++++++count%2B%2B;
++++}
++++return+result;
}|code-block|syntax|javascript|921254|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|$]]

Java 8
<pre><code>private static int[] range(int start, int stop, int step) {
 int[] result = new int[(stop-start)%step == 0 ? (stop-start)/step : (stop-start)/step+1];
 int count = 0;
 Function&lt;Integer, Boolean&gt; condition = step &gt; 0 ? (x) -&gt; x &lt; stop : (x) -&gt; x &gt; stop;
 for (int i = start; condition.apply(i); i += step) {
 result[count] = i;
 count++;
 }
 return result;
}
</code></pre>

Does Java have an equivalent to Python's <code>range(int, int)</code> method?

问Java:等同于Python的range(int，int)？
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回答 12

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