Java中有许多应用类，这些类定义静态方法可以解决很多常见的问题。下面是通过5万个开源项目统计得到的最热门的16个应用类。 类按热门程序排列，类的方法也是按热门程序排序。
浏览这个类可以看看有哪些功能不用再自己写了。 非常有用。 点击链接可以看到具体使用的示例。 原文转自：http://www.programcreek.com/2015/12/top-10-java-utility-classes/
1.org.apache.commons.io.IOUtils
- closeQuietly ( )
- toString ( )
- copy ( )
- toByteArray ( )
- write ( )
- toInputStream ( )
- readLines ( )
- copyLarge ( )
- lineIterator ( )
- readFully ( )
2.org.apache.commons.io.FileUtils
- deleteDirectory ( )
- readFileToString ( )
- deleteQuietly ( )
- copyFile ( )
- writeStringToFile ( )
- forceMkdir ( )
- write ( )
- listFiles ( )
- copyDirectory ( )
- forceDelete ( )
3.org.apache.commons.lang.StringUtils
- isBlank ( )
- isNotBlank ( )
- isEmpty ( )
- isNotEmpty ( )
- equals ( )
- join ( )
- split ( )
- EMPTY
- trimToNull ( )
- replace ( )
4.org.apache.http.util.EntityUtils
5.org.apache.commons.lang3.StringUtils
- isBlank ( )
- isNotBlank ( )
- isEmpty ( )
- isNotEmpty ( )
- join ( )
- equals ( )
- split ( )
- EMPTY
- replace ( )
- capitalize ( )
6.org.apache.commons.io.FilenameUtils
- getExtension ( )
- getBaseName ( )
- getName ( )
- concat ( )
- removeExtension ( )
- normalize ( )
- wildcardMatch ( )
- separatorsToUnix ( )
- getFullPath ( )
- isExtension ( )
7.org.springframework.util.StringUtils
- hasText ( )
- hasLength ( )
- isEmpty ( )
- commaDelimitedListToStringArray ( )
- collectionToDelimitedString ( )
- replace ( )
- delimitedListToStringArray ( )
- uncapitalize ( )
- collectionToCommaDelimitedString ( )
- tokenizeToStringArray ( )
8.org.apache.commons.lang.ArrayUtils
- contains ( )
- addAll ( )
- clone ( )
- isEmpty ( )
- add ( )
- EMPTY_BYTE_ARRAY
- subarray ( )
- indexOf ( )
- isEquals ( )
- toObject ( )
9.org.apache.commons.lang.StringEscapeUtils
- escapeHtml ( )
- unescapeHtml ( )
- escapeXml ( )
- escapeSql ( )
- unescapeJava ( )
- escapeJava ( )
- escapeJavaScript ( )
- unescapeXml ( )
- unescapeJavaScript ( )
10.org.apache.http.client.utils.URLEncodedUtils
11.org.apache.commons.codec.digest.DigestUtils
12.org.apache.commons.collections.CollectionUtils
- isEmpty ( )
- isNotEmpty ( )
- select ( )
- transform ( )
- filter ( )
- find ( )
- collect ( )
- forAllDo ( )
- addAll ( )
- isEqualCollection ( )
13.org.apache.commons.lang3.ArrayUtils
- contains ( )
- isEmpty ( )
- isNotEmpty ( )
- add ( )
- clone ( )
- addAll ( )
- subarray ( )
- indexOf ( )
- EMPTY_OBJECT_ARRAY
- EMPTY_STRING_ARRAY
14.org.apache.commons.beanutils.PropertyUtils
- getProperty ( )
- setProperty ( )
- getPropertyDescriptors ( )
- isReadable ( )
- copyProperties ( )
- getPropertyDescriptor ( )
- getSimpleProperty ( )
- isWriteable ( )
- setSimpleProperty ( )
- getPropertyType ( )
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