|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectcom.jgoodies.common.base.Strings
public class Strings
Provides frequently used static null-safe String testing methods .
Constructor Summary | |
---|---|
protected |
Strings()
|
Method Summary | |
---|---|
static String |
abbreviateCenter(String str,
int maxLength)
Abbreviates the given string if it exceeds the given maximum length by replacing its center part with an ellipsis ('…'). |
static boolean |
isBlank(String str)
Checks if the given string is whitespace, empty ("") or null . |
static boolean |
isEmpty(String str)
Checks if the given string is empty ("") or null . |
static boolean |
isNotBlank(String str)
Checks if the given string is not empty (""), not null and not whitespace only. |
static boolean |
isNotEmpty(String str)
Checks if the given string is not empty ("") and not null . |
static boolean |
startsWithIgnoreCase(String str,
String prefix)
Checks if str starts with the given prefix ignoring cases. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
protected Strings()
Method Detail |
---|
public static boolean isBlank(String str)
null
.
Strings.isBlank(null) == true Strings.isBlank("") == true Strings.isBlank(" ") == true Strings.isBlank(" abc") == false Strings.isBlank("abc ") == false Strings.isBlank(" abc ") == false
str
- the string to check, may be null
true
if the string is whitespace, empty
or null
isEmpty(String)
public static boolean isNotBlank(String str)
null
and not whitespace only.
Strings.isNotBlank(null) == false Strings.isNotBlank("") == false Strings.isNotBlank(" ") == false Strings.isNotBlank(" abc") == true Strings.isNotBlank("abc ") == true Strings.isNotBlank(" abc ") == true
str
- the string to check, may be null
true
if the string is not empty
and not null
and not whitespace onlyisEmpty(String)
public static boolean isEmpty(String str)
null
.
Strings.isEmpty(null) == true Strings.isEmpty("") == true Strings.isEmpty(" ") == false Strings.isEmpty("Hi ") == false
str
- the string to check, may be null
true
if the string is empty or null
isBlank(String)
public static boolean isNotEmpty(String str)
null
.
Strings.isNotEmpty(null) == false Strings.isNotEmpty("") == false Strings.isNotEmpty(" ") == true Strings.isNotEmpty("Hi") == true Strings.isNotEmpty("Hi ") == true
str
- the string to check, may be null
true
if the string is not empty and not null
isBlank(String)
public static boolean startsWithIgnoreCase(String str, String prefix)
str
starts with the given prefix ignoring cases.
null
is handled safely; if both arguments are null, true
is returned, false otherwise.
Strings.startsWithIgnoreCase(null, null) == true Strings.startsWithIgnoreCase("a", null) == false Strings.startsWithIgnoreCase(null, "a") == false Strings.startsWithIgnoreCase("", "") == true Strings.startsWithIgnoreCase(" ", "") == true Strings.startsWithIgnoreCase("John", "J") == true Strings.startsWithIgnoreCase("John", "Jo") == true Strings.startsWithIgnoreCase("John", "Joh") == true Strings.startsWithIgnoreCase("John", "joh") == true Strings.startsWithIgnoreCase("john", "Joh") == true Strings.startsWithIgnoreCase("john", "joh") == true Strings.startsWithIgnoreCase("John", "John") == true Strings.startsWithIgnoreCase("John", "john") == true Strings.startsWithIgnoreCase("John", "Jonny") == false
str
- the test string to check, may be nullprefix
- the prefix to check for, may be null
true
, if the string starts with the prefix, ignoring cases,
false
otherwiseString.startsWith(java.lang.String)
public static String abbreviateCenter(String str, int maxLength)
null
or shorter than the limit,
it is returned as is.
Strings.abbreviateCenter(null, 3) == null Strings.abbreviateCenter("", 3) == "" Strings.abbreviateCenter(" ", 3) == " " Strings.abbreviateCenter("a", 3) == "a" Strings.abbreviateCenter("ab", 3) == "ab" Strings.abbreviateCenter("abc", 3) == "abc" Strings.abbreviateCenter("abcd", 3) == "a…d" Strings.abbreviateCenter("abcde", 3) == "a…e" Strings.abbreviateCenter("abcde", 4) == "ab…e" Strings.abbreviateCenter("abcdef", 4) == "ab…f" Strings.abbreviateCenter("abcdefg", 5) == "ab…fg"
str
- the source stringmaxLength
- the maximum length of the result string
str
if its length is less than or equal to maxLength
,
an abbreviated string with length maxLength
where
the center is replaced by an ellipsis
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |