1 . public static boolean isEmpty(String
str) 判断某字符串是否为空,为空的标准是 str== null 或
str.length()== 0 下面是 StringUtils 判断是否为空的示例: StringUtils.isEmpty( null )
= true StringUtils.isEmpty( "" )
= true StringUtils.isEmpty( "
" ) = false //注意在
StringUtils 中空格作非空处理 StringUtils.isEmpty( "
" ) = false StringUtils.isEmpty( "bob" )
= false StringUtils.isEmpty( "
bob " ) = false 2 . public static boolean isNotEmpty(String
str) 判断某字符串是否非空,等于 !isEmpty(String str) 下面是示例: StringUtils.isNotEmpty( null )
= false StringUtils.isNotEmpty( "" )
= false StringUtils.isNotEmpty( "
" ) = true StringUtils.isNotEmpty( "
" ) = true StringUtils.isNotEmpty( "bob" )
= true StringUtils.isNotEmpty( "
bob " ) = true 3 . public static boolean isBlank(String
str) 判断某字符串是否为空或长度为 0 或由空白符(whitespace)
构成 下面是示例: StringUtils.isBlank( null )
= true StringUtils.isBlank( "" )
= true StringUtils.isBlank( "
" ) = true StringUtils.isBlank( "
" ) = true StringUtils.isBlank( "\t
\n \f \r" ) = true //对于制表符、换行符、换页符和回车符 StringUtils.isBlank() //均识为空白符 StringUtils.isBlank( "\b" )
= false //"\b"为单词边界符 StringUtils.isBlank( "bob" )
= false StringUtils.isBlank( "
bob " ) = false 4 . public static boolean isNotBlank(String
str) 判断某字符串是否不为空且长度不为 0 且不由空白符(whitespace)
构成,等于 !isBlank(String str) 下面是示例: StringUtils.isNotBlank( null )
= false StringUtils.isNotBlank( "" )
= false StringUtils.isNotBlank( "
" ) = false StringUtils.isNotBlank( "
" ) = false StringUtils.isNotBlank( "\t
\n \f \r" ) = false StringUtils.isNotBlank( "\b" )
= true StringUtils.isNotBlank( "bob" )
= true StringUtils.isNotBlank( "
bob " ) = true |
StringUtils的isBlank与isEmply
最新推荐文章于 2025-03-28 16:42:45 发布
