public class StringUtils extends Object
| 构造器和说明 |
|---|
StringUtils() |
| 限定符和类型 | 方法和说明 |
|---|---|
static boolean |
isBlank(String str)
Checks if a String is whitespace, empty ("") or null.
|
static boolean |
isBoolean(String str)
判断字符串是不是boolean, 先经过isNumeric(String str)判断是不是数字 再使用此方法
|
static boolean |
isEmpty(String str)
Checks if a String is empty ("") or null.
|
static boolean |
isIntegerNumeric(String str)
判断字符串是不是Integer, 先经过isNumeric(String str)判断是不是数字 再使用此方法
|
static boolean |
isNotBlank(String str)
Checks if a String is not empty (""), not null and not whitespace only.
|
static boolean |
isNotEmpty(String str)
Checks if a String is not empty ("") and not null.
|
static boolean |
isNumeric(String str)
判断字符串是不是数字(包括小数)
|
public static boolean isEmpty(String str)
Checks if a String is empty ("") or null.
StringUtils.isEmpty(null) = true
StringUtils.isEmpty("") = true
StringUtils.isEmpty(" ") = false
StringUtils.isEmpty("bob") = false
StringUtils.isEmpty(" bob ") = false
NOTE: This method changed in Lang version 2.0. It no longer trims the String. That functionality is available in isBlank().
str - the String to check, may be nulltrue if the String is empty or nullpublic static boolean isNotEmpty(String str)
Checks if a String is not empty ("") and not null.
StringUtils.isNotEmpty(null) = false
StringUtils.isNotEmpty("") = false
StringUtils.isNotEmpty(" ") = true
StringUtils.isNotEmpty("bob") = true
StringUtils.isNotEmpty(" bob ") = true
str - the String to check, may be nulltrue if the String is not empty and not nullpublic static boolean isBlank(String str)
Checks if a String is whitespace, empty ("") or null.
StringUtils.isBlank(null) = true
StringUtils.isBlank("") = true
StringUtils.isBlank(" ") = true
StringUtils.isBlank("bob") = false
StringUtils.isBlank(" bob ") = false
str - the String to check, may be nulltrue if the String is null, empty or whitespacepublic static boolean isNotBlank(String str)
Checks if a String is not empty (""), not null and not whitespace only.
StringUtils.isNotBlank(null) = false
StringUtils.isNotBlank("") = false
StringUtils.isNotBlank(" ") = false
StringUtils.isNotBlank("bob") = true
StringUtils.isNotBlank(" bob ") = true
str - the String to check, may be nulltrue if the String is
not empty and not null and not whitespacepublic static boolean isNumeric(String str)
str - public static boolean isIntegerNumeric(String str)
str - public static boolean isBoolean(String str)
str - Copyright © 2017. All Rights Reserved.