标签:style color java strong sp div on bs line
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的工具类isBlank与isEmply
标签:style color java strong sp div on bs line
原文地址:http://www.cnblogs.com/shangxiaofei/p/4037886.html