Package com.shaiksphere.mindsmine.jems
Class StringHelper
- java.lang.Object
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- com.shaiksphere.mindsmine.jems.StringHelper
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Method Summary
Modifier and Type Method Description static boolean
areEqual(String string1, String string2)
Returnstrue
if the passed values are equal, ignoring the case,false
otherwise.static boolean
areEqual(String string1, String string2, boolean lenient)
Returnstrue
if the passed values are equal,false
otherwise.static String
getNullSafe(String string)
Returns a non-null string, even if the object being passed is a null string.static boolean
isBlank(String string)
Returnstrue
if the passed value is an empty string, false otherwise.static boolean
isOnlyDigits(String string)
Returnstrue
if the passed string contains only digits, false otherwise.static boolean
isPalindrome(String string)
Returnstrue
if the passed string is a palindrome, ignoring the case,false
otherwise.static boolean
isPalindrome(String string, boolean lenient)
Returnstrue
if the passed string is a palindrome,false
otherwise.
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Method Detail
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getNullSafe
public static String getNullSafe(String string)
Returns a non-null string, even if the object being passed is a null string.
If the passed-in object is a non-null string, then it is returned as-is.
Example usage:String str1 = "Hello"; String str2 = null; String str3 = StringHelper.getNullSafe(str1); String str4 = StringHelper.getNullSafe(str2); // str3 now contains the string: "Hello" // str4 now contains the string: ""
- Parameters:
string
- The string to safeguard againstnull
.- Returns:
- If str is
null
then""
(empty string). - Since:
- 1.0
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isBlank
public static boolean isBlank(String string)
Returnstrue
if the passed value is an empty string, false otherwise.
The value is deemed to be an empty string if it is either:null
- a zero-length string
- comprised of whitespaces as defined by
Character.isWhitespace(char)
Example usage:StringHelper.isBlank(null) = true StringHelper.isBlank("") = true StringHelper.isBlank(" ") = true StringHelper.isBlank("something ") = false
- Parameters:
string
- The value to test.- Returns:
true
if the passed value is an empty string, false otherwise.- Since:
- 1.0
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areEqual
public static boolean areEqual(String string1, String string2)
Returnstrue
if the passed values are equal, ignoring the case,false
otherwise.
Convenience method equivalent toStringHelper.areEqual(string1, string2, true)
- Parameters:
string1
- to comparestring2
- to compare- Returns:
- whether two strings are equal
- Since:
- 1.0
- See Also:
areEqual(String, String, boolean)
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areEqual
public static boolean areEqual(String string1, String string2, boolean lenient)
Returnstrue
if the passed values are equal,false
otherwise.
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When the lenient flag is set to
true
, the comparison will ignore the case and trim the strings before comparing; the two strings are considered equal if,- Both strings are blank, as defined by
isBlank(String)
. - Trimmed versions of both strings, as defined by
String.trim()
, are equal.
- Both strings are blank, as defined by
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When the lenient flag is set to
false
, the two strings are considered equal if,- Both strings are not null
- Both strings represent the same sequence of characters
Example usage:StringHelper.areEqual(null, null, true) = true StringHelper.areEqual(null, "", true) = true StringHelper.areEqual("", null, true) = true StringHelper.areEqual("", "", true) = true StringHelper.areEqual(" ", "", true) = true StringHelper.areEqual(" abc", "abc ", true) = true StringHelper.areEqual("", "abc", true) = false StringHelper.areEqual("ab c", "abc", true) = false StringHelper.areEqual("ABC", "abc", true) = true StringHelper.areEqual("abc", "abc", true) = true StringHelper.areEqual(null, null, false) = false StringHelper.areEqual(null, "", false) = false StringHelper.areEqual("", null, false) = false StringHelper.areEqual("", "", false) = true StringHelper.areEqual(" ", "", false) = false StringHelper.areEqual(" abc", "abc ", false) = false StringHelper.areEqual("", "abc", false) = false StringHelper.areEqual("ab c", "abc", false) = false StringHelper.areEqual("ABC", "abc", false) = false StringHelper.areEqual("abc", "abc", false) = true
- Parameters:
string1
- to comparestring2
- to comparelenient
- whether to be lenient or not- Returns:
- whether two strings are equal
- Since:
- 2.1.0
- See Also:
String.equalsIgnoreCase(String)
,String.equals(Object)
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When the lenient flag is set to
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isOnlyDigits
public static boolean isOnlyDigits(String string)
Returnstrue
if the passed string contains only digits, false otherwise.
Example usage:StringHelper.isOnlyDigits(null) = false StringHelper.isOnlyDigits("") = false StringHelper.isOnlyDigits(" ") = false StringHelper.isOnlyDigits("something ") = false StringHelper.isOnlyDigits("11.67") = false StringHelper.isOnlyDigits("17650") = true
- Parameters:
string
- to check- Returns:
- whether the string contains only digits
- Since:
- 1.0
- See Also:
String.matches(String)
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isPalindrome
public static boolean isPalindrome(String string)
Returnstrue
if the passed string is a palindrome, ignoring the case,false
otherwise.
Convenience method equivalent toStringHelper.isPalindrome(string, true)
- Parameters:
string
- to check- Returns:
- if the string is a Palindrome
- Since:
- 2.1.0
- See Also:
isPalindrome(String, boolean)
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isPalindrome
public static boolean isPalindrome(String string, boolean lenient)
Returnstrue
if the passed string is a palindrome,false
otherwise.
A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward, such as madam or kayak.
Convenience method equivalent toStringHelper.areEqual(string, string.reverse, flag)
Example usage:StringHelper.isPalindrome(null, true) = true StringHelper.isPalindrome("", true) = true StringHelper.isPalindrome(" ", true) = true StringHelper.isPalindrome(" aba", true) = true StringHelper.isPalindrome("aba", true) = true StringHelper.isPalindrome("mAdAm", true) = true StringHelper.isPalindrome("madAm", true) = true StringHelper.isPalindrome("madam", true) = true StringHelper.isPalindrome("Madam", true) = true StringHelper.isPalindrome("hello", true) = false StringHelper.isPalindrome(null, false) = false StringHelper.isPalindrome("", false) = true StringHelper.isPalindrome(" ", false) = true StringHelper.isPalindrome(" aba", false) = false StringHelper.isPalindrome("aba", false) = true StringHelper.isPalindrome("mAdAm", false) = true StringHelper.isPalindrome("madAm", false) = false StringHelper.isPalindrome("madam", false) = true StringHelper.isPalindrome("Madam", false) = false StringHelper.isPalindrome("hello", false) = false
- Parameters:
string
- to checklenient
- whether to be lenient or not- Returns:
- if the string is a Palindrome
- Since:
- 2.1.0
- See Also:
areEqual(String, String, boolean)
, Palindrome (Wikipedia)
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