IntroductionStrings class has static helper methods for easing several String operations. some methods in this class are copied and slightly modified from Apache commons-lang library. DetailsVerificationisNullOrEmpty checks if a string is null or emprty (zero length String). Strings.isNullOrEmpty(""); // true
Strings.isNullOrEmpty(null); // trueallNullOrEmpty checks if all the strings sent is null or empty Strings.allNullOrEmpty("", null, null); //true
Strings.allNullOrEmpty(null, "aaa"); //falsehasText returns true if there is any character in the string other than white space. if String is null, empty or consist of only white space characters, returns false Strings.hasText(null); // false
Strings.hasText(""); // false
Strings.hasText(" \t"); // false
Strings.hasText("a "); // trueallHasText checks if all the Strings send to the method has text in it. it fails if any is empty, null, or contain only white space. Strings.allHasText(" ", "hello", "world"); // false
Strings.hasText("a","b"); // trueManipulationleftTrim and rightTrim are self explanatory. Trims the white space from the beginning or the end of the String. containsNone checks if string has any of the given invalid characters. if string is null, returns true. Strings.containsNone(null, *) // true
Strings.containsNone(*, null) // true
Strings.containsNone("", *) // true
Strings.containsNone("ab", "") // true
Strings.containsNone("ab1", "xyz") // true
Strings.containsNone("abz", "xyz") // falsereverse reverses the string. if null, returns null. Strings.reverse(null) // null
Strings.reverse("hello") // "olleh"insertFromLeft inserts a string with given intervals to the string. Negative interval will result an IllegalArgumentException. insertFromLeft("0123456789",0,"-") // "0123456789"
insertFromLeft("0123456789",1,"-") // "0-1-2-3-4-5-6-7-8-9"
insertFromLeft("0123456789",2,"-") // "01-23-45-67-89"
insertFromLeft("0123456789",3,"-") // "012-345-678-9"
insertFromLeft("0123456789",2,"--") // "01--23--45--67--89"insertFromRight inserts a string with given interval. insertFromRight("0123456789",3,"-") // "0-123-456-789"
insertFromRight("0123456789",3,"--") // "0--123--456--789"eliminateWhiteSpaces eliminates ALL white spaces in a string. eliminateWhiteSpaces("as d ") // "asd"
eliminateWhiteSpaces("as \t \r \f d ") // "asd"whiteSpacesToSingleSpace reduces white space character(s) to a single "space" character. whiteSpacesToSingleSpace("as d ") // "as d "
whiteSpacesToSingleSpace("as \t d") // "as d"repeat creates a String by repeating desired String or character. repeat('c', -1) // ""
repeat('c', 3) // "ccc"
repeat('c', 0) // ""
repeat("ab", -1) // ""
repeat("ab", 3) // "ababab"
repeat("ab", 0) // ""subStringUntilFirst gets the sub string of a string until the first ocurrance of a given string. subStringUntilFirst("hello", "el") // "h"
subStringUntilFirst("hellohello", "el") // "h"
subStringUntilFirst("hello", "") // "hello"
subStringUntilFirst("hello", "el") // ""
subStringUntilFirst("", "el") // ""
subStringUntilFirst(null, "el") // nullsubStringUntilLast gets the sub string of a string after the first ocurrance of a given string. subStringUntilLast("hello", "el") // "h"
subStringUntilLast("hellohello", "el") // "helloh"subStringAfterFirst gets the sub string of a string until the last ocurrance of a given string. subStringAfterFirst("hello", "el") // "lo"
subStringAfterFirst("hellohello", "el") // "lohello"subStringAfterLast gets the sub string of a string after the last ocurrance of a given string. subStringAfterLast("hello", "el") // "lo"
subStringAfterLast("hellohello", "el") // "lo"separateGrams this is a special method. it separates a String into neighbouring characters sequences. separateGrams("hello", 2) // {"he", "el", "ll", "lo"}
separateGrams("hello", 3) // {"hel", "ell", "llo"}
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php ve javascriptteki gibi split fonksiyonuda olsa çok güzel olur.