blocks|key|5254109|text|Calendar+cal+=+Calendar.getInstance();+
cal.add(Calendar.MONTH,+1);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5254110|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>Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);
</code></pre>

blocks|key|3836676|text|您可以使用apache的commons+lang+DateUtils助手实用程序类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3836677|Date+newDate+=+DateUtils.addMonths(new+Date(),+1);|code-block|syntax|javascript|3836678|您可以在http://commons.apache.org/proper/commons-lang/下载commons+lang+jar|offset|length|3836679|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/proper/commons-lang/^0|0|0|4|1A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You can make use of apache's commons lang DateUtils helper utility class.

<pre><code>Date newDate = DateUtils.addMonths(new Date(), 1);
</code></pre>

You can download commons lang jar at <a href="http://commons.apache.org/proper/commons-lang/">http://commons.apache.org/proper/commons-lang/</a>

blocks|key|1481856|text|tl;dr|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1481857|LocalDate::plusMonths|code-block|syntax|javascript|1481858|示例：|1481859|LocalDate.now(+)
+++++++++.plusMonths(+1+);|1481860|最好指定时区。|1481861|LocalDate.now(+ZoneId.of(+"America/Montreal"+)
+++++++++.plusMonths(+1+);|1481862|java.time|1481863|java.time框架内置于Java8和更高版本中。这些类取代了旧的麻烦的日期时间类，如java.util.Date、.Calendar和java.text.SimpleDateFormat。Joda-Time团队还建议迁移到java.time。|offset|length|style|CODE|1481864|要了解更多信息，请参阅Oracle+Tutorial。和搜索堆栈溢出，以获得许多示例和解释。|1481865|在ThreeTen-Backport中，java.time的大部分功能都被移植到Java6和7中，并在ThreeTenABP中进一步适用于安卓。|1481866|仅日期|1481867|如果只想使用日期，请使用LocalDate类。|1481868|ZoneId+z+=+ZoneId.of(+"America/Montreal"+);
+LocalDate+today+=+LocalDate.now(+z+);|1481869|1481870|+today.toString()：2017-01-23|blockquote|1481871|1481872|1481873|添加一个月。|1481874|LocalDate+oneMonthLater+=+today.plusMonths(+1+);|1481875|1481876|+oneMonthLater.toString()：2017-02-23|1481877|1481878|1481879|日期-时间|1481880|也许你想要一天中的时间和日期。|1481881|首先获取分辨率为nanoseconds的UTC格式的当前时刻。|1481882|Instant+instant+=+Instant.now();|1481883|添加一个月意味着确定日期。确定日期意味着应用时区。对于任何给定的时刻，世界各地的日期都不同，新的一天在东方破晓得更早。因此，将Instant调整为一个时区。|1481884|ZoneId+zoneId+=+ZoneId.of(+"America/Montreal"+);
ZonedDateTime+zdt+=+ZonedDateTime.ofInstant(+instant+,+zoneId+);|1481885|现在添加您的月份。让java.time处理Leap月份，以及月份长度不同的事实。|1481886|ZonedDateTime+zdtMonthLater+=+zdt.plusMonths(+1+);|1481887|在进行这种计算时，您可能希望将一天中的时间调整为一天中的第一个时刻。第一个时刻并不总是00:00:00.0的，所以让java.time来决定当天的时间。|1481888|ZonedDateTime+zdtMonthLaterStartOfDay+=+zdtMonthLater.toLocalDate().atStartOfDay(+zoneId+);|1481889|1481890|关于java.time|1481891|框架内置于Java8和更高版本中。这些类取代了麻烦的旧legacy日期时间类，如java.util.Date、Calendar和SimpleDateFormat。|1481892|要了解更多信息，请参阅。和搜索堆栈溢出，以获得许多示例和解释。规范为JSR+310。|1481893|现在在maintenance+mode中的项目建议迁移到java.time类。|1481894|您可以直接与数据库交换java.time对象。使用与JDBC+4.2或更高版本兼容的JDBC+driver。不需要字符串，也不需要java.sql.*类。Hibernate+5和JPA2.2支持java.time。|1481895|从哪里获取java.time类？|1481896|1481897|，、、和更高版本-标准Java+API的一部分，具有捆绑的实现。|unordered-list-item|1481898|带来了一些次要的特性和fixes.|1481899|1481900|1481901|1481902|和.|1481903|中的+|1481904|大多数java.time功能已向后移植到Java6和7|1481905|1481906|1481907|+|1481908|更高版本的Android+(26%2B)捆绑了java.time类的实现。|1481909|对于较早的Android+(<26)，的进程带来了最初没有内置到Android中的subset+of+the+功能。|1481910|如果去糖化没有提供你需要的东西，项目会让+(上面提到的)适应安卓系统。请参阅.|1481911|1481912|1481913|1481914|1481915|Joda-Time|1481916|更新:+Joda-Time项目现在处于维护模式。它的团队建议迁移到java.time类。我要把这一部分原封不动地留给后代。|1481917|Joda-Time库提供了一种以智能方式添加月份的方法。|1481918|DateTimeZone+timeZone+=+DateTimeZone.forID(+"Europe/Paris"+);
DateTime+now+=+DateTime.now(+timeZone+);
DateTime+nextMonth+=+now.plusMonths(+1+);|1481919|您可能希望通过将一天中的时间调整为一天中的第一个时刻来关注这一天。|1481920|DateTime+nextMonth+=+now.plusMonths(+1+).withTimeAtStartOfDay();|1481921|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html|1|http://www.joda.org/joda-time/|2|http://docs.oracle.com/javase/tutorial/datetime/TOC.html|3|http://www.threeten.org/threetenbp/|4|https://github.com/JakeWharton/ThreeTenABP|5|https://en.m.wikipedia.org/wiki/Nanosecond|6|https://en.m.wikipedia.org/wiki/Coordinated_Universal_Time|7|https://en.wikipedia.org/wiki/Legacy_system|8|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Date.html|9|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Calendar.html|10|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/text/SimpleDateFormat.html|11|https://jcp.org/en/jsr/detail?id=310|12|https://en.wikipedia.org/wiki/Maintenance_mode|13|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/package-summary.html|14|http://openjdk.java.net/jeps/170|15|https://en.wikipedia.org/wiki/JDBC_driver|16|https://developer.android.com/studio/write/java8-support-table|17^0|0|0|0|0|0|0|0|18|E|1N|9|1X|Q|0|9|0|2O|9|1|0|B|F|2|0|1|H|3|1F|B|4|0|0|C|9|0|0|0|0|0|0|0|0|0|0|0|0|0|0|8|B|5|K|3|6|0|0|1R|7|0|0|0|0|17|A|0|0|0|0|14|E|1J|8|1S|G|R|6|7|14|E|8|1J|8|9|1S|G|A|0|Y|7|B|0|3|G|C|S|9|D|0|1T|A|Q|8|E|16|B|F|0|0|0|1|1|0|0|0|0|0|0|0|0|1|1|15|E|G|2|2|1|0|0|0|0|0|0|9|H|0|0|0|0^^$0|@$1|2|3|4|5|6|7|4S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|4T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|4U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|4V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|4W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|4X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|4Y|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|4Z|8|@$S|50|T|51|U|V]|$S|52|T|53|U|V]|$S|54|T|55|U|V]]|9|@$S|56|T|57|1|58]|$S|59|T|5A|1|5B]]|A|$]]|$1|W|3|X|5|6|7|5C|8|@]|9|@$S|5D|T|5E|1|5F]]|A|$]]|$1|Y|3|Z|5|6|7|5G|8|@]|9|@$S|5H|T|5I|1|5J]|$S|5K|T|5L|1|5M]]|A|$]]|$1|10|3|11|5|6|7|5N|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|5O|8|@$S|5P|T|5Q|U|V]]|9|@]|A|$]]|$1|14|3|15|5|D|7|5R|8|@]|9|@]|A|$E|F]]|$1|16|3|-4|5|6|7|5S|8|@]|9|@]|A|$]]|$1|17|3|18|5|19|7|5T|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|5U|8|@]|9|@]|A|$]]|$1|1B|3|-4|5|6|7|5V|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|5W|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|D|7|5X|8|@]|9|@]|A|$E|F]]|$1|1G|3|-4|5|6|7|5Y|8|@]|9|@]|A|$]]|$1|1H|3|1I|5|19|7|5Z|8|@]|9|@]|A|$]]|$1|1J|3|-4|5|6|7|60|8|@]|9|@]|A|$]]|$1|1K|3|-4|5|6|7|61|8|@]|9|@]|A|$]]|$1|1L|3|1M|5|6|7|62|8|@]|9|@]|A|$]]|$1|1N|3|1O|5|6|7|63|8|@]|9|@]|A|$]]|$1|1P|3|1Q|5|6|7|64|8|@]|9|@$S|65|T|66|1|67]|$S|68|T|69|1|6A]]|A|$]]|$1|1R|3|1S|5|D|7|6B|8|@]|9|@]|A|$E|F]]|$1|1T|3|1U|5|6|7|6C|8|@$S|6D|T|6E|U|V]]|9|@]|A|$]]|$1|1V|3|1W|5|D|7|6F|8|@]|9|@]|A|$E|F]]|$1|1X|3|1Y|5|6|7|6G|8|@]|9|@]|A|$]]|$1|1Z|3|20|5|D|7|6H|8|@]|9|@]|A|$E|F]]|$1|21|3|22|5|6|7|6I|8|@$S|6J|T|6K|U|V]]|9|@]|A|$]]|$1|23|3|24|5|D|7|6L|8|@]|9|@]|A|$E|F]]|$1|25|3|-4|5|6|7|6M|8|@]|9|@]|A|$]]|$1|26|3|27|5|6|7|6N|8|@]|9|@]|A|$]]|$1|28|3|29|5|6|7|6O|8|@$S|6P|T|6Q|U|V]|$S|6R|T|6S|U|V]|$S|6T|T|6U|U|V]]|9|@$S|6V|T|6W|1|6X]|$S|6Y|T|6Z|1|70]|$S|71|T|72|1|73]|$S|74|T|75|1|76]]|A|$]]|$1|2A|3|2B|5|6|7|77|8|@]|9|@$S|78|T|79|1|7A]]|A|$]]|$1|2C|3|2D|5|6|7|7B|8|@]|9|@$S|7C|T|7D|1|7E]|$S|7F|T|7G|1|7H]]|A|$]]|$1|2E|3|2F|5|6|7|7I|8|@$S|7J|T|7K|U|V]]|9|@$S|7L|T|7M|1|7N]|$S|7O|T|7P|1|7Q]]|A|$]]|$1|2G|3|2H|5|6|7|7R|8|@]|9|@]|A|$]]|$1|2I|3|-4|5|6|7|7S|8|@]|9|@]|A|$]]|$1|2J|3|2K|5|2L|7|7T|8|@]|9|@]|A|$]]|$1|2M|3|2N|5|2L|7|7U|8|@]|9|@]|A|$]]|$1|2O|3|-4|5|6|7|7V|8|@]|9|@]|A|$]]|$1|2P|3|-4|5|6|7|7W|8|@]|9|@]|A|$]]|$1|2Q|3|-4|5|6|7|7X|8|@]|9|@]|A|$]]|$1|2R|3|2S|5|2L|7|7Y|8|@]|9|@]|A|$]]|$1|2T|3|2U|5|6|7|7Z|8|@]|9|@]|A|$]]|$1|2V|3|2W|5|2L|7|80|8|@]|9|@]|A|$]]|$1|2X|3|-4|5|6|7|81|8|@]|9|@]|A|$]]|$1|2Y|3|-4|5|6|7|82|8|@]|9|@]|A|$]]|$1|2Z|3|30|5|2L|7|83|8|@]|9|@]|A|$]]|$1|31|3|32|5|2L|7|84|8|@]|9|@]|A|$]]|$1|33|3|34|5|2L|7|85|8|@]|9|@$S|86|T|87|1|88]]|A|$]]|$1|35|3|36|5|2L|7|89|8|@]|9|@]|A|$]]|$1|37|3|-4|5|6|7|8A|8|@]|9|@]|A|$]]|$1|38|3|-4|5|6|7|8B|8|@]|9|@]|A|$]]|$1|39|3|-4|5|6|7|8C|8|@]|9|@]|A|$]]|$1|3A|3|-4|5|6|7|8D|8|@]|9|@]|A|$]]|$1|3B|3|3C|5|6|7|8E|8|@]|9|@]|A|$]]|$1|3D|3|3E|5|6|7|8F|8|@]|9|@]|A|$]]|$1|3F|3|3G|5|6|7|8G|8|@]|9|@$S|8H|T|8I|1|8J]]|A|$]]|$1|3H|3|3I|5|D|7|8K|8|@]|9|@]|A|$E|F]]|$1|3J|3|3K|5|6|7|8L|8|@]|9|@]|A|$]]|$1|3L|3|3M|5|D|7|8M|8|@]|9|@]|A|$E|F]]|$1|3N|3|-4|5|6|7|8N|8|@]|9|@]|A|$]]]|3O|$3P|$5|3Q|3R|3S|A|$3T|3U]]|3V|$5|3Q|3R|3S|A|$3T|3W]]|3X|$5|3Q|3R|3S|A|$3T|3Y]]|3Z|$5|3Q|3R|3S|A|$3T|40]]|41|$5|3Q|3R|3S|A|$3T|42]]|43|$5|3Q|3R|3S|A|$3T|44]]|45|$5|3Q|3R|3S|A|$3T|46]]|47|$5|3Q|3R|3S|A|$3T|48]]|49|$5|3Q|3R|3S|A|$3T|4A]]|4B|$5|3Q|3R|3S|A|$3T|4C]]|4D|$5|3Q|3R|3S|A|$3T|4E]]|4F|$5|3Q|3R|3S|A|$3T|4G]]|4H|$5|3Q|3R|3S|A|$3T|4I]]|4J|$5|3Q|3R|3S|A|$3T|4K]]|4L|$5|3Q|3R|3S|A|$3T|4M]]|4N|$5|3Q|3R|3S|A|$3T|4O]]|4P|$5|3Q|3R|3S|A|$3T|4Q]]|4R|$5|3Q|3R|3S|A|$3T|3W]]]]

<h1>tl;dr</h1>
<pre><code>LocalDate::plusMonths
</code></pre>
Example:
<pre><code>LocalDate.now( )
 .plusMonths( 1 );
</code></pre>
Better to specify time zone.
<pre><code>LocalDate.now( ZoneId.of( &quot;America/Montreal&quot; )
 .plusMonths( 1 );
</code></pre>
<h1>java.time</h1>
The <a href="http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> framework is built into Java 8 and later. These classes supplant the old troublesome date-time classes such as <code>java.util.Date</code>, <code>.Calendar</code>, &amp; <code>java.text.SimpleDateFormat</code>. The <a href="http://www.joda.org/joda-time/" rel="nofollow noreferrer">Joda-Time</a> team also advises migration to java.time.
To learn more, see the <a href="http://docs.oracle.com/javase/tutorial/datetime/TOC.html" rel="nofollow noreferrer">Oracle Tutorial</a>. And search Stack Overflow for many examples and explanations.
Much of the java.time functionality is back-ported to Java 6 &amp; 7 in <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a> and further adapted to Android in <a href="https://github.com/JakeWharton/ThreeTenABP" rel="nofollow noreferrer">ThreeTenABP</a>.
<h2>Date-only</h2>
If you want the date-only, use the <code>LocalDate</code> class.
<pre><code>ZoneId z = ZoneId.of( &quot;America/Montreal&quot; );
 LocalDate today = LocalDate.now( z );
</code></pre>
<blockquote>
today.toString(): 2017-01-23
</blockquote>
Add a month.
<pre><code>LocalDate oneMonthLater = today.plusMonths( 1 );
</code></pre>
<blockquote>
oneMonthLater.toString(): 2017-02-23
</blockquote>
<h2>Date-time</h2>
Perhaps you want a time-of-day along with the date.
First get the current moment in <a href="https://en.m.wikipedia.org/wiki/Coordinated_Universal_Time" rel="nofollow noreferrer">UTC</a> with a resolution of <a href="https://en.m.wikipedia.org/wiki/Nanosecond" rel="nofollow noreferrer">nanoseconds</a>.
<pre><code>Instant instant = Instant.now();
</code></pre>
Adding a month means determining dates. And determining dates means applying a time zone. For any given moment, the date varies around the world with a new day dawning earlier to the east. So adjust that <code>Instant</code> into a time zone.
<pre><code>ZoneId zoneId = ZoneId.of( &quot;America/Montreal&quot; );
ZonedDateTime zdt = ZonedDateTime.ofInstant( instant , zoneId );
</code></pre>
Now add your month. Let java.time handle Leap month, and the fact that months vary in length.
<pre><code>ZonedDateTime zdtMonthLater = zdt.plusMonths( 1 );
</code></pre>
You might want to adjust the time-of-day to the first moment of the day when making this kind of calculation. That first moment is not always <code>00:00:00.0</code> so let java.time determine the time-of-day.
<pre><code>ZonedDateTime zdtMonthLaterStartOfDay = zdtMonthLater.toLocalDate().atStartOfDay( zoneId );
</code></pre>
<hr />
<h1>About java.time</h1>
The <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> framework is built into Java 8 and later. These classes supplant the troublesome old <a href="https://en.wikipedia.org/wiki/Legacy_system" rel="nofollow noreferrer">legacy</a> date-time classes such as <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Date.html" rel="nofollow noreferrer"><code>java.util.Date</code></a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Calendar.html" rel="nofollow noreferrer"><code>Calendar</code></a>, &amp; <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/text/SimpleDateFormat.html" rel="nofollow noreferrer"><code>SimpleDateFormat</code></a>.
To learn more, see the <a href="http://docs.oracle.com/javase/tutorial/datetime/TOC.html" rel="nofollow noreferrer">Oracle Tutorial</a>. And search Stack Overflow for many examples and explanations. Specification is <a href="https://jcp.org/en/jsr/detail?id=310" rel="nofollow noreferrer">JSR 310</a>.
The <a href="http://www.joda.org/joda-time/" rel="nofollow noreferrer">Joda-Time</a> project, now in <a href="https://en.wikipedia.org/wiki/Maintenance_mode" rel="nofollow noreferrer">maintenance mode</a>, advises migration to the <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> classes.
You may exchange java.time objects directly with your database. Use a <a href="https://en.wikipedia.org/wiki/JDBC_driver" rel="nofollow noreferrer">JDBC driver</a> compliant with <a href="http://openjdk.java.net/jeps/170" rel="nofollow noreferrer">JDBC 4.2</a> or later. No need for strings, no need for <code>java.sql.*</code> classes. Hibernate 5 &amp; JPA 2.2 support java.time.
Where to obtain the java.time classes?
<ul>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8" rel="nofollow noreferrer">Java SE 8</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_9" rel="nofollow noreferrer">Java SE 9</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_10" rel="nofollow noreferrer">Java SE 10</a>, <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_11" rel="nofollow noreferrer">Java SE 11</a>, and later - Part of the standard Java API with a bundled implementation.
<ul>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_9" rel="nofollow noreferrer">Java 9</a> brought some minor features and fixes.</li>
</ul>
</li>
<li><a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_6" rel="nofollow noreferrer">Java SE 6</a> and <a href="https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7" rel="nofollow noreferrer">Java SE 7</a>
<ul>
<li>Most of the java.time functionality is back-ported to Java 6 &amp; 7 in <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a>.</li>
</ul>
</li>
<li><a href="https://en.wikipedia.org/wiki/Android_(operating_system)" rel="nofollow noreferrer">Android</a>
<ul>
<li>Later versions of Android (26+) bundle implementations of the java.time classes.</li>
<li>For earlier Android (&lt;26), the process of <a href="https://developer.android.com/studio/write/java8-support#library-desugaring" rel="nofollow noreferrer">API desugaring</a> brings a <a href="https://developer.android.com/studio/write/java8-support-table" rel="nofollow noreferrer">subset of the java.time</a> functionality not originally built into Android.
<ul>
<li>If the desugaring does not offer what you need, the <a href="https://github.com/JakeWharton/ThreeTenABP" rel="nofollow noreferrer">ThreeTenABP</a> project adapts <a href="http://www.threeten.org/threetenbp/" rel="nofollow noreferrer">ThreeTen-Backport</a> (mentioned above) to Android. See <a href="http://stackoverflow.com/q/38922754/642706">How to use ThreeTenABP…</a>.</li>
</ul>
</li>
</ul>
</li>
</ul>
<hr />
<h1>Joda-Time</h1>
Update: The Joda-Time project is now in maintenance mode. Its team advises migration to the java.time classes. I am leaving this section intact for posterity.
The <a href="http://www.joda.org/joda-time/" rel="nofollow noreferrer">Joda-Time</a> library offers a method to add months in a smart way.
<pre><code>DateTimeZone timeZone = DateTimeZone.forID( &quot;Europe/Paris&quot; );
DateTime now = DateTime.now( timeZone );
DateTime nextMonth = now.plusMonths( 1 );
</code></pre>
You might want to focus on the day by adjust the time-of-day to the first moment of the day.
<pre><code>DateTime nextMonth = now.plusMonths( 1 ).withTimeAtStartOfDay();
</code></pre>

blocks|key|5254259|text|(改编自Duggu)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5254260|public+static+Date+addOneMonth(Date+date)
{
++++Calendar+cal+=+Calendar.getInstance();
++++cal.setTime(date);
++++cal.add(Calendar.MONTH,+1);
++++return+cal.getTime();
}|code-block|syntax|javascript|5254261|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|$]]

(adapted from Duggu)

<pre><code>public static Date addOneMonth(Date date)
{
 Calendar cal = Calendar.getInstance();
 cal.setTime(date);
 cal.add(Calendar.MONTH, 1);
 return cal.getTime();
}
</code></pre>

blocks|key|1486148|text|Calendar+cal+=+Calendar.getInstance();+
cal.add(Calendar.MONTH,+1);
java.util.Date+dt+=+cal.getTime();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1486149|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>Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);
java.util.Date dt = cal.getTime();
</code></pre>

blocks|key|3836832|text|Java+8|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3836833|LocalDate+futureDate+=+LocalDate.now().plusMonths(1);|code-block|syntax|javascript|3836834|entityMap^0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Java 8

<pre><code>LocalDate futureDate = LocalDate.now().plusMonths(1);
</code></pre>

blocks|key|1727346|text|为了找出一个月后的第几天，有必要看看今天是哪个月的哪一天。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1727347|因此，如果这一天是每月的第一天，则按照以下代码运行|1727348|Calendar+calendar+=+Calendar.getInstance();

++++Calendar+calFebruary+=+Calendar.getInstance();
++++calFebruary.set(Calendar.MONTH,+Calendar.FEBRUARY);

++++if+(calendar.get(Calendar.DAY_OF_MONTH)+==+1)+{//+if+first+day+of+month
++++calendar.add(Calendar.MONTH,+1);
++++calendar.set(Calendar.DATE,+calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
++++Date+nextMonthFirstDay+=+calendar.getTime();
++++System.out.println(nextMonthFirstDay);

++++}|code-block|syntax|javascript|1727349|如果这一天是一个月的最后一天，则运行以下代码。|1727350|++++else+if+((calendar.getActualMaximum(Calendar.DAY_OF_MONTH)+==+calendar.get(Calendar.DAY_OF_MONTH)))+{//+if+last+day+of+month
++++calendar.add(Calendar.MONTH,+1);
++++calendar.set(Calendar.DATE,+calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
++++Date+nextMonthLastDay+=+calendar.getTime();
++++System.out.println(nextMonthLastDay);
++++}|1727351|如果这一天在二月，则运行以下代码|1727352|++++else+if+(calendar.get(Calendar.MONTH)+==+Calendar.JANUARY
++++++++++++&&+calendar.get(Calendar.DAY_OF_MONTH)+>+calFebruary.getActualMaximum(Calendar.DAY_OF_MONTH))+{//+control+of+february

++++calendar.add(Calendar.MONTH,+1);
++++calendar.set(Calendar.DATE,+calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
++++Date+nextMonthLastDay+=+calendar.getTime();
++++System.out.println(nextMonthLastDay);

++++}|1727353|以下代码用于其他情况。|1727354|++++else+{+//+any+day
++++calendar.add(Calendar.DATE,+calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
++++Date+theNextDate+=+calendar.getTime();
++++System.out.println(theNextDate);
++++}|1727355|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

In order to find the day after one month, it is necessary to look at what day of the month it is today.

So if the day is first day of month run following code

<pre><code>Calendar calendar = Calendar.getInstance();

 Calendar calFebruary = Calendar.getInstance();
 calFebruary.set(Calendar.MONTH, Calendar.FEBRUARY);

 if (calendar.get(Calendar.DAY_OF_MONTH) == 1) {// if first day of month
 calendar.add(Calendar.MONTH, 1);
 calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
 Date nextMonthFirstDay = calendar.getTime();
 System.out.println(nextMonthFirstDay);

 }
</code></pre>

if the day is last day of month, run following codes.

<pre><code> else if ((calendar.getActualMaximum(Calendar.DAY_OF_MONTH) == calendar.get(Calendar.DAY_OF_MONTH))) {// if last day of month
 calendar.add(Calendar.MONTH, 1);
 calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
 Date nextMonthLastDay = calendar.getTime();
 System.out.println(nextMonthLastDay);
 }
</code></pre>

if the day is in february run following code

<pre><code> else if (calendar.get(Calendar.MONTH) == Calendar.JANUARY
 &amp;&amp; calendar.get(Calendar.DAY_OF_MONTH) &gt; calFebruary.getActualMaximum(Calendar.DAY_OF_MONTH)) {// control of february

 calendar.add(Calendar.MONTH, 1);
 calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
 Date nextMonthLastDay = calendar.getTime();
 System.out.println(nextMonthLastDay);

 }
</code></pre>

the following codes are used for other cases.

<pre><code> else { // any day
 calendar.add(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
 Date theNextDate = calendar.getTime();
 System.out.println(theNextDate);
 }
</code></pre>

blocks|key|1727386|text|如果您需要一行代码(即Jasper报告公式)，并且不介意调整时间不是恰好一个月(即"30天“就足够了)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1727387|new+Date($F{invoicedate}.getTime()+%2B+30L+*+24L+*+60L+*+60L+*+1000L)|offset|length|style|CODE|1727388|entityMap^0|0|0|1V|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

If you need a one-liner (i.e. for Jasper Reports formula) and don't mind if the adjustment is not exactly one month (i.e "30 days" is enough): 

<code>new Date($F{invoicedate}.getTime() + 30L * 24L * 60L * 60L * 1000L)</code>

blocks|key|3837016|text|使用calander并尝试此代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3837017|Calendar+calendar+=+Calendar.getInstance();+++++++++
calendar.add(Calendar.MONTH,+1);
calendar.set(Calendar.DATE,+calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
Date+nextMonthFirstDay+=+calendar.getTime();
calendar.set(Calendar.DATE,+calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date+nextMonthLastDay+=+calendar.getTime();|code-block|syntax|javascript|3837018|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|$]]

Use calander and try this code.

<pre><code>Calendar calendar = Calendar.getInstance(); 
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
Date nextMonthFirstDay = calendar.getTime();
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date nextMonthLastDay = calendar.getTime();
</code></pre>

blocks|key|1727459|text|public+Date++addMonths(String+dateAsString,+int+nbMonths)+throws+ParseException+{
++++++++String+format+=+"MM/dd/yyyy"+;
++++++++SimpleDateFormat+sdf+=+new+SimpleDateFormat(format)+;
++++++++Date+dateAsObj+=+sdf.parse(dateAsString)+;
++++++++Calendar+cal+=+Calendar.getInstance();
++++++++cal.setTime(dateAsObj);
++++++++cal.add(Calendar.MONTH,+nbMonths);
++++++++Date+dateAsObjAfterAMonth+=+cal.getTime()+;
++++System.out.println(sdf.format(dateAsObjAfterAMonth));
++++return+dateAsObjAfterAMonth+;
}`|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1727460|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>public Date addMonths(String dateAsString, int nbMonths) throws ParseException {
 String format = "MM/dd/yyyy" ;
 SimpleDateFormat sdf = new SimpleDateFormat(format) ;
 Date dateAsObj = sdf.parse(dateAsString) ;
 Calendar cal = Calendar.getInstance();
 cal.setTime(dateAsObj);
 cal.add(Calendar.MONTH, nbMonths);
 Date dateAsObjAfterAMonth = cal.getTime() ;
 System.out.println(sdf.format(dateAsObjAfterAMonth));
 return dateAsObjAfterAMonth ;
}`
</code></pre>

blocks|key|3837061|text|此方法返回当前日期加1个月。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3837062|public+Date++addOneMonth()++{
++++++++Calendar+cal+=+Calendar.getInstance();
++++++++cal.add(Calendar.MONTH,+1);
++++++++return+cal.getTime();
}`|code-block|syntax|javascript|3837063|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|$]]

This method returns the current date plus 1 month.

<pre><code>public Date addOneMonth() {
 Calendar cal = Calendar.getInstance();
 cal.add(Calendar.MONTH, 1);
 return cal.getTime();
}`
</code></pre>

blocks|key|5254470|text|你可以像这样使用；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5254471|SimpleDateFormat+sdf+=+new+SimpleDateFormat("yyyy-MM-dd");
String+d+=+"2000-01-30";
Date+date=+new+Date(sdf.parse(d).getTime());
date.setMonth(date.getMonth()+%2B+1);|code-block|syntax|javascript|5254472|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 like this;

<pre><code>SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String d = "2000-01-30";
Date date= new Date(sdf.parse(d).getTime());
date.setMonth(date.getMonth() + 1);
</code></pre>

blocks|key|1486265|text|++++Date+dateAfterOneMonth+=+new+DateTime(System.currentTimeMillis()).plusMonths(1).toDate();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1486266|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> Date dateAfterOneMonth = new DateTime(System.currentTimeMillis()).plusMonths(1).toDate();
</code></pre>

blocks|key|1486278|text|你可以在org.apache.commons.lang3.time包中使用DateUtils类|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486279|DateUtils.addMonths(new+Date(),1);|code-block|syntax|javascript|1486280|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 DateUtils class in org.apache.commons.lang3.time package

<pre><code>DateUtils.addMonths(new Date(),1);
</code></pre>

blocks|key|1727541|text|public+class+StringSplit+{

++++public+static+void+main(String[]+args)+{
++++++++//+TODO+Auto-generated+method+stub

++++++++date(5,+3);
++++++++date(5,+4);
++++}

++++public+static+String+date(int+month,+int+week)+{
++++++++LocalDate+futureDate+=+LocalDate.now().plusMonths(month).plusWeeks(week);
++++++++String+Fudate+=+futureDate.toString();
++++++++String[]+arr+=+Fudate.split("-",+3);
++++++++String+a1+=+arr[0];
++++++++String+a2+=+arr[1];
++++++++String+a3+=+arr[2];
++++++++String+date+=+a3+%2B+"/"+%2B+a2+%2B+"/"+%2B+a1;
++++++++System.out.println(date);
++++++++return+date;
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1727542|输出：|unstyled|1727543|10/03/2020
17/03/2020|1727544|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>public class StringSplit {

 public static void main(String[] args) {
 // TODO Auto-generated method stub

 date(5, 3);
 date(5, 4);
 }

 public static String date(int month, int week) {
 LocalDate futureDate = LocalDate.now().plusMonths(month).plusWeeks(week);
 String Fudate = futureDate.toString();
 String[] arr = Fudate.split("-", 3);
 String a1 = arr[0];
 String a2 = arr[1];
 String a3 = arr[2];
 String date = a3 + "/" + a2 + "/" + a1;
 System.out.println(date);
 return date;
 }
}
</code></pre>

Output:

<pre><code>10/03/2020
17/03/2020
</code></pre>

blocks|key|5254549|text|常量是葡萄牙语的，因为是的，但是javadoc是可以理解的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5254550|只要打个电话|5254551|Calendar+cal+=+Calendar.getInstance();
cal.setTime(yourDate);
DateSumUtil.sumOneMonth(cal);|code-block|syntax|javascript|5254552|就是这样。相关代码：|5254553|package+you.project.your_package_utils;

import+java.text.ParseException;
import+java.text.SimpleDateFormat;
import+java.util.Arrays;
import+java.util.Calendar;
import+java.util.List;

public+class+DateSumUtil+{

++++private+static+Integer[]+meses31+=+{+2,+4,+7,+9+};
++++private+static+List<Integer>+meses31List+=+Arrays.asList(meses31);
++++private+static+SimpleDateFormat+s+=+new+SimpleDateFormat("dd/MM/yyyy");

++++private+static+final+int+MES+=+Calendar.MONTH;
++++private+static+final+int+ANO+=+Calendar.YEAR;
++++private+static+final+int+DIA+=+Calendar.DAY_OF_MONTH;

++++/**
+++++*+Receives+a+date+and+adds+one+month.+<br+/>
+++++*+
+++++*+@param+c+date+to+receive+an+added+month,+as+{@code+java.util.Calendar}
+++++*+@param+dia+day+of+month+of+the+original+month
+++++*/
++++public+static+void+addOneMonth(Calendar+c,+int+dia)+throws+ParseException+{
++++if+(cal.get(MES)+==+0)+{++++++++++++if+(dia+<+29)+++++++++++cal.add(MES,+1);
++++++++else+{++if+(cal.get(ANO)+%25+4+==+0)+{++++if+(dia+<+30)+++cal.add(MES,+1);
++++++++++++++++++++++++++++++++++++++++++++++++else++++++++++++cal.setTime(s.parse("29/02/"+%2B+cal.get(ANO)));
++++++++++++++++}+else+{++++++++++++++++++++++++if+(dia+<+29)+++cal.add(MES,+1);
++++++++++++++++++++++++++++++++++++++++++++++++else++++++++++++cal.setTime(s.parse("28/02/"+%2B+cal.get(ANO)));
++++}+++}+++}+else+if+(meses31List.contains(cal.get(MES)))+{
++++++++if+(dia+<+31)+{+++++++++++++++++++++++++++++++++++++++++cal.add(Calendar.MONTH,+1);
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++cal.set(DIA,+dia);
++++++++}+else++cal.setTime(s.parse("30/"+%2B+(cal.get(MES)+%2B+2)+%2B+"/"+%2B+cal.get(ANO)));
++++}+else+{++++++++++++++++++++++++++++++++++++++++++++++++++++cal.add(MES,+1);
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++cal.set(DIA,+dia);++}+++
}|5254554|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Constants are in Portuguese because yes, but javadoc is understandable enough.
Just call
<pre><code>Calendar cal = Calendar.getInstance();
cal.setTime(yourDate);
DateSumUtil.sumOneMonth(cal);
</code></pre>
and that's that. Related code:
<pre><code>package you.project.your_package_utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.List;

public class DateSumUtil {

 private static Integer[] meses31 = { 2, 4, 7, 9 };
 private static List&lt;Integer&gt; meses31List = Arrays.asList(meses31);
 private static SimpleDateFormat s = new SimpleDateFormat(&quot;dd/MM/yyyy&quot;);

 private static final int MES = Calendar.MONTH;
 private static final int ANO = Calendar.YEAR;
 private static final int DIA = Calendar.DAY_OF_MONTH;

 /**
 * Receives a date and adds one month. &lt;br /&gt;
 * 
 * @param c date to receive an added month, as {@code java.util.Calendar}
 * @param dia day of month of the original month
 */
 public static void addOneMonth(Calendar c, int dia) throws ParseException {
 if (cal.get(MES) == 0) { if (dia &lt; 29) cal.add(MES, 1);
 else { if (cal.get(ANO) % 4 == 0) { if (dia &lt; 30) cal.add(MES, 1);
 else cal.setTime(s.parse(&quot;29/02/&quot; + cal.get(ANO)));
 } else { if (dia &lt; 29) cal.add(MES, 1);
 else cal.setTime(s.parse(&quot;28/02/&quot; + cal.get(ANO)));
 } } } else if (meses31List.contains(cal.get(MES))) {
 if (dia &lt; 31) { cal.add(Calendar.MONTH, 1);
 cal.set(DIA, dia);
 } else cal.setTime(s.parse(&quot;30/&quot; + (cal.get(MES) + 2) + &quot;/&quot; + cal.get(ANO)));
 } else { cal.add(MES, 1);
 cal.set(DIA, dia); } 
}
</code></pre>

In Java how can I add one month to the current date?

How do I add one month to current date in Java?

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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在Java中，如何在当前日期基础上添加一个月？

问如何在Java中向当前日期添加一个月？
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问如何在Java中向当前日期添加一个月？EN