JAVA StringUtils Tool Class

Org.apache.commons.lang
Class StringUtils

Java.lang.Object  

Org.apache.commons.lang.StringUtils

stringutilsextends Object

Operations on that is String null safe.

• Isempty/isblank -Checks if a String contains text
• Trim/strip -removes leading and trailing whitespace
• Equals -Compares strings Null-safe
• StartsWith -check if a String starts with a prefix null-safe
• EndsWith -check if a String ends with a suffix null-safe
• indexof/lastindexof/contains -Null-safe index-of Checks
• indexofany/lastindexofany/indexofanybut/lastindexofanybut -index-of any of a set of Strings
• Containsonly/containsnone/containsany -does String contains only/none/any of these characters
• substring/left/right/mid -Null-safe Substring extractions
• substringbefore/substringafter/substringbetween -substring extraction relative to other strings
• Split/join -Splits a String to an array of substrings and vice versa
• remove/delete -Removes part of a String
• Replace/overlay -Searches a string and replaces one string with another
• chomp/chop -Removes the last part of a String
• leftpad/rightpad/center/repeat -Pads a String
• uppercase/lowercase/swapcase/capitalize/uncapitalize -Changes the case of a String
• countmatches -counts the number of occurrences of one String in another
• isalpha/isnumeric/iswhitespace/isasciiprintable -checks the characters in a String
• defaultstring -protects against a null input String
• reverse/reversedelimited -Reverses a String
• abbreviate -abbreviates a string using ellipsis
• difference -compares Strings and reports on their differences
• levensteindistance -The number of changes needed to change one String into another

The StringUtils class defines certain words related to String handling.

• Null-null
• Empty-a zero-length string ( "" )
• Space-the space character ( ‘ ‘ , char 32)
• Whitespace-the characters defined byCharacter.isWhitespace(char)
• Trim-the characters <=String.trim()

StringUtilsHandles null input Strings quietly. That's to say. A null input would return null . Where a boolean or is int being returned details vary by method.

A side effect of the null handling is a NullPointerException should being considered a bug in StringUtils (except for deprecated methods).

Methods in this class give the sample code to explain their operation. The symbol is * used to indicate any input including null .

Translation: Google

Org.apache.commons.lang
class StringUtils

Org.apache.commons.lang.StringUtils

public class StringUtils Extended Object

the action String to do this is a null safe.

• Isempty/isblank -Check whether a string contains text
• Trim/Remove -Remove leading and trailing blanks
• equals -Comparison of two invalid strings
• StartsWith -Check whether a string begins with a prefix of NULL
• EndsWith -Check whether a string ends with a suffix of null
• Indexof/lastindexof/contains -Check for invalid indexes
• indexofany/lastindexofany/indexofanybut/lastindexofanybut -index-any set of strings
• Containsonly/containsnone/containsany -is a string containing only/none/any of these characters
• substring/Left/right/medium -0 Safe substring extraction
• Substringbefore/substringafter/substringbetween -substring extraction relative to other strings
• Split/Connect -Splits a string into an array of substrings and vice versa
• Delete/delete -Delete part of string
• Replace/overwrite -Search for a string and replace it with another string
• Chomp/chop -Delete The last part of the string
• left keyboard/Right keyboard/center/Repeat - fill string
• uppercase/lowercase/swapcase/capitalize/uncapitalize -Change Case of String
• countmatches -Count the occurrences of another string
• isalpha/isnumeric/iswhitespace/isasciiprintable -Check the characters in the string
• defaultstring -Prevent null input string
• reverse/reversedelimited -Reverse String
• Abbreviations -use ellipses to abbreviate strings
• difference -Compare strings and report differences
• levensteindistance -Change the number of changes required to change one string to another

in the StringUtils class defines some words with string processing.

• Null value-null
• null-a 0-length string ( "" )
• spaces-Empty characters ( ‘ ‘ Char)
• Spaces-by ... The defined charactersCharacter.isWhitespace(char)
• Trim-Characters in <= 32String.trim()

StringUtilsnullquietly to processing The input string. This means that one null input will be returned null . the boolean int details of where or are returning are different depending on the method.

a side effect null of treatment is a NullPointerException should be considered a mistake StringUtils (except for deprecated methods).

The methods in this class give sample code to explain their operation. the symbol * is used to indicate any input that is included null .

Checks if the string is empty

Isnotempty The space parameter as well, Isnotblank excludes the space argument

Isnoneempty can add multiple parameters  Isnoneblank can add multiple parameters, exclude the space parameter


Remove whitespace before and after a string
Trim/strip

Comparison of two strings for equality
Equals

Checks whether a string starts with a null prefix
StartsWith

Checks if the string ends with a null suffix

Checks if the string contains a specific character
Indexof/lastindexof/contains

JAVA StringUtils Tool Class