blocks|key|351791|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|351792|📷|atomic|offset|length|351793|您的代码是正确的。|351794|确保使用参数来运行它。|351795|如果您是在Eclipse中运行：|351796|1.+Run+Configuration
2.+Arguments+Tab
3.+Enter+the+number+in+Program+Arguments.|code-block|syntax|javascript|351797|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/06c86b89bf0036c6c4ef2ff070a90116.png|imageAlt^0|0|0|1|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@$E|12|F|13|1|14]]|A|$]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|18|8|@]|9|@]|A|$P|Q]]|$1|R|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

<a href="https://i.stack.imgur.com/xA6oW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xA6oW.png" alt="enter image description here"></a>Your code is right.

Make sure that you ran it with arguments.

If you are running from Eclipse:

<pre><code>1. Run Configuration
2. Arguments Tab
3. Enter the number in Program Arguments.
</code></pre>

blocks|key|3287511|text|错误出现在三个地方：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3287512|在您的程序中添加|3287513|。您需要确保args不是空数组(确保用户确实提供了至少1个arg)。以调用程序的方式使用|ordered-list-item|offset|length|style|CODE|3287514|。您很可能没有传递任何参数。如果你从命令行运行你的程序，你可以用下面的方法：|3287515|3287516|java+array2.Array2+5|3287517|应输出“May”。|3287518|确保从参数解析的整数在范围内。|unordered-list-item|3287519|3287520|if(args.length+==+0)+{+System.out.println(“错误，必须指定一个参数”)；}+else+{+int+m=+Integer.parseInt(+args+)；if(m<0+%7C%7C+m>+12)+{System.out.println(“指定的月份无效”)；}+else+{System.out.println(月m)；}+}|3287521|entityMap^0|0|0|6|4|0|0|0|0|K|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@$G|12|H|13|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|16|8|@$G|17|H|18|I|J]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1A|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1C|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Y|$]]

The error is at three places:

<ol>
<li>In your program. You need to make sure that <code>args</code> is not an empty array (make sure that the user has indeed provided at least 1 arg). </li>
<li>In the way your invoke your program. You are most likely not passing any arguments. If you are running your program from command line, you can do it the following way:

<code>java array2.Array2 5</code>

Should print "May".</li>
<li>Make sure the parsed int from the argument is within range.

<pre><code>if(args.length == 0) {
 System.out.println("Error, must specify one argument");
}
else {
 int m = Integer.parseInt( args[0] );
 if(m&lt;0 || m&gt; 12) {
 System.out.println("Invalid month specified");
 }
 else {
 System.out.println( months[ m ] );
 }
}
</code></pre></li>
</ol>

blocks|key|3287542|text|我看到您正在使用Netbeans，因此请转到您的运行配置->参数，在程序参数中添加例如“105314”，然后您需要避免使用indexOutOfBoundExcepion|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3287543|+++int+m+=+Integer.parseInt(+args[0]+);
+++if(m>=0&&m<13)
+++System.out.println(+months[+m+]+);|code-block|syntax|javascript|3287544|entityMap^0|8|8|1P|N|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I see that you are using <code>Netbeans</code>, so Go to your Run Configurations-> Arguments, in the Program arguments add for example "10 5 3 14", and then you need to avoid <code>indexOutOfBoundExcepion</code>:

<pre><code> int m = Integer.parseInt( args[0] );
 if(m&gt;=0&amp;&amp;m&lt;13)
 System.out.println( months[ m ] );
</code></pre>

blocks|key|349132|text|传递参数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|349133|正如其他答案所述，在运行此问题时，您可能无法传递参数。|349134|如果使用NetBeans、IntelliJ或Eclipse等IDE，则必须深入研究该工具允许您指定要传递给main方法的参数的位置。|offset|length|style|CODE|349135|例如，在NetBeans中：|349136|349137|打开项目属性。|ordered-list-item|349138|选择Run。|349139|在Arguments字段中，键入月份数字，如7。|349140|单击OK保存更改。|349141|运行您的项目。|349142|349143|​|349144|📷|atomic|349145|349146|测试参数|349147|为了进行调试，您应该将参数数组转储到控制台进行验证。并且您应该测试预期的参数数量。下面是执行这两个任务的示例代码。|349148|public+class+App+{

++++public+static+String+months[];

++++public+static+void+main+(+String[]+args+)+{

++++++++months+=+new+String[+13+];
++++++++months[+0+]+=+null;
++++++++months[+1+]+=+"January";
++++++++months[+2+]+=+"February";
++++++++months[+3+]+=+"March";
++++++++months[+4+]+=+"April";
++++++++months[+5+]+=+"May";
++++++++months[+6+]+=+"June";
++++++++months[+7+]+=+"July";
++++++++months[+8+]+=+"August";
++++++++months[+9+]+=+"September";
++++++++months[+10+]+=+"October";
++++++++months[+11+]+=+"November";
++++++++months[+12+]+=+"December";

++++++++System.out.println+(+"DEBUG+args:+"+%2B+Arrays.toString+(+args+)+);
++++++++if+(+args.length+==+0+)+{
++++++++++++System.out.println+(+"No+month+specified.+No+arguments+passed+to+'main'+method."+);
++++++++}+else+if+(+args.length+==+1+)+{++//+Else+we+have+a+single+argument+as+expected.
++++++++++++int+m+=+Integer.parseInt+(+args[+0+]+);
++++++++++++System.out.println+(+months[+m+]+);
++++++++}+else+if+(+args.length+>+1+)+{++//+Else+we+have+multiple+arguments,+but+expected+only+one.
++++++++++++System.out.println+(+"ERROR+-+more+than+one+argument+passed+to+'main'+method."+);
++++++++}+else+{++//+Else+impossible.+Should+not+reach+this+point.+Defensive+programming.
++++++++++++System.out.println+(+"ERROR+-+Unexpectedly+reached+IF-ELSE.+Should+be+impossible."+);
++++++++}
…|code-block|syntax|javascript|349149|349150|调试参数:+8、7、9|blockquote|349151|349152|错误-多个参数传递给'main‘方法。|349153|349154|您可以看到这个code+run+live+at+IdeOne.com。不幸的是，这个web应用似乎有一个bug:不能传递输入参数。所以目前对我们的目的来说没有什么用处，但我留下了链接，以防将来修复这个bug。|349155|java.time|349156|虽然我知道您正在做练习来学习Java编程，但您应该意识到，在实际工作中，您不需要这样定义月份。相反，您将使用Month+enum，它是java.time类的一部分。枚举是一组静态常量。与conventional+enums相比，Enums+in+Java更强大、更灵活、更有用。|349157|Month+month+=+Month.of+(+5+);+//+Months+are+numbered+1-12+for+January-December.+So+5+=+May.
String+output+=+month.getDisplayName+(+TextStyle.FULL+,+Locale.CANADA_FRENCH+);++//+Automatically+localize+the+name+of+the+month.
String+output2+=+Month.DECEMBER.getDisplayName+(+TextStyle.FULL+,+Locale.CANADA_FRENCH+);++//+Refer+to+a+`Month`+object+by+the+name+of+a+constant.+Here:+Month.DECEMBER|349158|转储到控制台。|349159|System.out.println+(+"month.toString():+"+%2B+month+);
System.out.println+(+"output:+"+%2B+output+);
System.out.println+(+"output2:+"+%2B+output2+);|349160|349161|+month.toString()：五月|349162|349163|输出:+mai|349164|output2:+décembre|349165|entityMap|0|LINK|mutability|MUTABLE|url|https://netbeans.org/|1|https://www.jetbrains.com/idea/|2|https://en.wikipedia.org/wiki/Integrated_development_environment|3|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e34639e8a8a08bcf3cdaaf60fa09ed39.png|imageAlt|4|http://ideone.com/q3jxsf|5|http://docs.oracle.com/javase/8/docs/api/java/time/Month.html|6|http://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html|7|https://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html|8|https://en.wikipedia.org/wiki/Enumerated_type|9|https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html^0|0|0|1H|4|4|8|0|D|8|1|U|3|2|0|0|0|0|2|3|0|1|9|M|1|0|2|2|0|0|0|0|0|1|3|0|0|0|0|0|0|0|0|0|0|7|R|4|0|0|1I|5|1I|5|5|1O|4|6|1V|9|7|2L|I|8|36|D|9|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|2Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|30|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|31|8|@$F|32|G|33|H|I]]|9|@$F|34|G|35|1|36]|$F|37|G|38|1|39]|$F|3A|G|3B|1|3C]]|A|$]]|$1|J|3|K|5|6|7|3D|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|3E|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|3F|8|@]|9|@]|A|$]]|$1|P|3|Q|5|O|7|3G|8|@$F|3H|G|3I|H|I]]|9|@]|A|$]]|$1|R|3|S|5|O|7|3J|8|@$F|3K|G|3L|H|I]|$F|3M|G|3N|H|I]]|9|@]|A|$]]|$1|T|3|U|5|O|7|3O|8|@$F|3P|G|3Q|H|I]]|9|@]|A|$]]|$1|V|3|W|5|O|7|3R|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|3S|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|3T|8|@]|9|@]|A|$]]|$1|10|3|11|5|12|7|3U|8|@]|9|@$F|3V|G|3W|1|3X]]|A|$]]|$1|13|3|Z|5|6|7|3Y|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|3Z|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|40|8|@]|9|@]|A|$]]|$1|18|3|19|5|1A|7|41|8|@]|9|@]|A|$1B|1C]]|$1|1D|3|-4|5|6|7|42|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|1G|7|43|8|@]|9|@]|A|$]]|$1|1H|3|-4|5|6|7|44|8|@]|9|@]|A|$]]|$1|1I|3|1J|5|6|7|45|8|@]|9|@]|A|$]]|$1|1K|3|-4|5|6|7|46|8|@]|9|@]|A|$]]|$1|1L|3|1M|5|6|7|47|8|@]|9|@$F|48|G|49|1|4A]]|A|$]]|$1|1N|3|1O|5|6|7|4B|8|@]|9|@]|A|$]]|$1|1P|3|1Q|5|6|7|4C|8|@$F|4D|G|4E|H|I]]|9|@$F|4F|G|4G|1|4H]|$F|4I|G|4J|1|4K]|$F|4L|G|4M|1|4N]|$F|4O|G|4P|1|4Q]|$F|4R|G|4S|1|4T]]|A|$]]|$1|1R|3|1S|5|1A|7|4U|8|@]|9|@]|A|$1B|1C]]|$1|1T|3|1U|5|6|7|4V|8|@]|9|@]|A|$]]|$1|1V|3|1W|5|1A|7|4W|8|@]|9|@]|A|$1B|1C]]|$1|1X|3|-4|5|6|7|4X|8|@]|9|@]|A|$]]|$1|1Y|3|1Z|5|1G|7|4Y|8|@]|9|@]|A|$]]|$1|20|3|-4|5|6|7|4Z|8|@]|9|@]|A|$]]|$1|21|3|22|5|6|7|50|8|@]|9|@]|A|$]]|$1|23|3|24|5|6|7|51|8|@]|9|@]|A|$]]|$1|25|3|-4|5|6|7|52|8|@]|9|@]|A|$]]]|26|$27|$5|28|29|2A|A|$2B|2C]]|2D|$5|28|29|2A|A|$2B|2E]]|2F|$5|28|29|2A|A|$2B|2G]]|2H|$5|2I|29|2J|A|$2K|2L|2M|-4]]|2N|$5|28|29|2A|A|$2B|2O]]|2P|$5|28|29|2A|A|$2B|2Q]]|2R|$5|28|29|2A|A|$2B|2S]]|2T|$5|28|29|2A|A|$2B|2U]]|2V|$5|28|29|2A|A|$2B|2W]]|2X|$5|28|29|2A|A|$2B|2Y]]]]

<h1>Pass arguments</h1>

As the other Answers state, you likely are failing to pass an argument when running this problem. 

If using an <a href="https://en.wikipedia.org/wiki/Integrated_development_environment" rel="nofollow noreferrer">IDE</a> such as <a href="https://netbeans.org" rel="nofollow noreferrer">NetBeans</a>, <a href="https://www.jetbrains.com/idea/" rel="nofollow noreferrer">IntelliJ</a>, or Eclipse, you must dig around to find where that tool lets you specify arguments to be passed to the <code>main</code> method. 

For example, in NetBeans: 

<ol>
<li>Open your project properties. </li>
<li>Select <code>Run</code>. </li>
<li>In the <code>Arguments</code> field, type a month number such as <code>7</code>. </li>
<li>Click <code>OK</code> to save the change.</li>
<li>Run your project.</li>
</ol>

<a href="https://i.stack.imgur.com/zwF8h.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zwF8h.png" alt="enter image description here"></a>

<h1>Test arguments</h1>

For debugging, you should dump the array of arguments to the console to verify. And you should be testing for expected number of arguments. Here is example code doing both those tasks.

<pre><code>public class App {

 public static String months[];

 public static void main ( String[] args ) {

 months = new String[ 13 ];
 months[ 0 ] = null;
 months[ 1 ] = "January";
 months[ 2 ] = "February";
 months[ 3 ] = "March";
 months[ 4 ] = "April";
 months[ 5 ] = "May";
 months[ 6 ] = "June";
 months[ 7 ] = "July";
 months[ 8 ] = "August";
 months[ 9 ] = "September";
 months[ 10 ] = "October";
 months[ 11 ] = "November";
 months[ 12 ] = "December";

 System.out.println ( "DEBUG args: " + Arrays.toString ( args ) );
 if ( args.length == 0 ) {
 System.out.println ( "No month specified. No arguments passed to 'main' method." );
 } else if ( args.length == 1 ) { // Else we have a single argument as expected.
 int m = Integer.parseInt ( args[ 0 ] );
 System.out.println ( months[ m ] );
 } else if ( args.length &gt; 1 ) { // Else we have multiple arguments, but expected only one.
 System.out.println ( "ERROR - more than one argument passed to 'main' method." );
 } else { // Else impossible. Should not reach this point. Defensive programming.
 System.out.println ( "ERROR - Unexpectedly reached IF-ELSE. Should be impossible." );
 }
…
</code></pre>

<blockquote>
 DEBUG args: [8, 7, 9]
 
 ERROR - more than one argument passed to 'main' method.
</blockquote>

You can see this <a href="http://ideone.com/q3jxsf" rel="nofollow noreferrer">code run live at IdeOne.com</a>. Unfortunately, that web app seems to have a bug: failing to pass the input arguments. So not useful at the moment for our purpose here, but I leave the link in case the bug is fixed in the future.

<h1>java.time</h1>

While I understand you are doing exercises to learn Java programming, you should be aware that you would not need to do this definition of months in real-world work. Instead you would use the <a href="http://docs.oracle.com/javase/8/docs/api/java/time/Month.html" rel="nofollow noreferrer"><code>Month</code></a> <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html" rel="nofollow noreferrer">enum</a>, part of the <a href="https://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> classe. An enum is a grouping of static constants. <a href="https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html" rel="nofollow noreferrer">Enums in Java</a> are vastly more powerful, flexible, and useful than <a href="https://en.wikipedia.org/wiki/Enumerated_type" rel="nofollow noreferrer">conventional enums</a>.

<pre><code>Month month = Month.of ( 5 ); // Months are numbered 1-12 for January-December. So 5 = May.
String output = month.getDisplayName ( TextStyle.FULL , Locale.CANADA_FRENCH ); // Automatically localize the name of the month.
String output2 = Month.DECEMBER.getDisplayName ( TextStyle.FULL , Locale.CANADA_FRENCH ); // Refer to a `Month` object by the name of a constant. Here: Month.DECEMBER
</code></pre>

Dump to console.

<pre><code>System.out.println ( "month.toString(): " + month );
System.out.println ( "output: " + output );
System.out.println ( "output2: " + output2 );
</code></pre>

<blockquote>
 month.toString(): MAY
 
 output: mai
 
 output2: décembre
</blockquote>

Hi I am trying to learn about arrays and our teacher gave us an extra assignment which says: "Create an array with every month of the year(January, February...). My code looks like this:

<pre><code>package array2;

public class Array2 {

 static String months[];
 public static void main(String[] args) {
 months = new String[13];
 months[0] = null ;
 months[1] = "January";
 months[2] = "February";
 months[3] = "March";
 months[4] = "April";
 months[5] = "May";
 months[6] = "June";
 months[7] = "July";
 months[8] = "August";
 months[9] = "September";
 months[10] = "October";
 months[11] = "November";
 months[12] = "December";
 int m = Integer.parseInt( args[0] );
 System.out.println( months[ m ] );
 }
}
</code></pre>

But I am getting the error 

<pre><code>"Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
 at array2.Array2.main(Array2.java:33)
/Users/Mo/Library/Caches/NetBeans/8.2/executor-snippets/run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)
</code></pre>

Can someone help clarify this?

Arrays - Output has to be the months of the year

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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嗨，我正在学习数组，我们的老师给我们布置了一个额外的作业：“创建一个数组，一年中的每个月(一月、二月……)。我的代码如下所示：package array2;public class Array2 {    static String months[];    public static void main(String...

问数组-输出必须是一年中的月份
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问数组-输出必须是一年中的月份EN