public final class Strings extends Object
Modifier and Type | Method and Description |
---|---|
static boolean |
isEmpty(CharSequence cs)
Checks if a CharSequence is empty ("") or null.
|
static boolean |
isNotEmpty(CharSequence cs)
Checks if a CharSequence is not empty ("") and not null.
|
static String |
trimToNull(String str)
Removes control characters (char <= 32) from both
ends of this String returning
null if the String is
empty ("") after the trim or if it is null . |
public static final String EMPTY
public static boolean isEmpty(CharSequence cs)
Checks if a CharSequence is empty ("") or null.
Strings.isEmpty(null) = true Strings.isEmpty("") = true Strings.isEmpty(" ") = false Strings.isEmpty("bob") = false Strings.isEmpty(" bob ") = false
NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence. That functionality is available in isBlank().
Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isEmpty(CharSequence)
cs
- the CharSequence to check, may be nulltrue
if the CharSequence is empty or nullpublic static boolean isNotEmpty(CharSequence cs)
Checks if a CharSequence is not empty ("") and not null.
Strings.isNotEmpty(null) = false Strings.isNotEmpty("") = false Strings.isNotEmpty(" ") = true Strings.isNotEmpty("bob") = true Strings.isNotEmpty(" bob ") = true
Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isNotEmpty(CharSequence)
cs
- the CharSequence to check, may be nulltrue
if the CharSequence is not empty and not nullpublic static String trimToNull(String str)
Removes control characters (char <= 32) from both
ends of this String returning null
if the String is
empty ("") after the trim or if it is null
.
The String is trimmed using String.trim()
.
Trim removes start and end characters <= 32.
Strings.trimToNull(null) = null Strings.trimToNull("") = null Strings.trimToNull(" ") = null Strings.trimToNull("abc") = "abc" Strings.trimToNull(" abc ") = "abc"
Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.trimToNull(String)
str
- the String to be trimmed, may be nullnull
if only chars <= 32, empty or null String inputCopyright © 1999-2015 Apache Software Foundation. All Rights Reserved.
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