Java Utility Methods

Java tutorial

Introduction

Java utility methods are organized in the following chapters.

A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z

A

B

Base Convert
Base Encode
Base128
Base16 Encode
Base2 Encode
Base64
Base64 Convert to
Base64 Decode
Base64 Encode
BCD Convert To
BCD Create
Beep
Bezier Curve
BigDeciaml Decode
BigDecimal
BigDecimal Add
BigDecimal Calculate
BigDecimal Ceiling
BigDecimal Compare
BigDecimal Create
BigDecimal Divide
BigDecimal Encode
BigDecimal Equal
BigDecimal Floor
BigDecimal Format
BigDecimal from
BigDecimal from String
BigDecimal Log
BigDecimal Max
BigDecimal Min
BigDecimal Multiply
BigDecimal Negate
BigDecimal Normalize
BigDecimal Parse
BigDecimal Power
BigDecimal Round
BigDecimal Square Root
BigDecimal Subtract
BigDecimal to
BigDecimal to String
BigDecimal Trim
BigDecimal Value Check
BigInteger Average
BigInteger Calculate
BigInteger Create
BigInteger Factorial
BigInteger Format
BigInteger From
BigInteger from Stream
BigInteger is Prime
BigInteger LCM
BigInteger Max
BigInteger Mod
BigInteger Parse
BigInteger Power
BigInteger Random
BigInteger Reverse
BigInteger to
BigInteger Value Check
Binary Convert to
Binary Encode
Binary Search
Binary to Boolean
Binary to Char
Binary to Decimal
Binary to Double
Binary to Hex
Binary to Int
Binary to Long
Binary to String
Binomial Coefficients
Bipolar to Double
Bit Clean
Bit Count
Bit Flip
Bit Get
Bit Mask
Bit Print
Bit Set
Bit Shift
Bit String From

Bit Unpack
Bit Unset
Bit Value Set
Bitmap Flip
Bits Convert to
Bits to Int
Bits to String
BitSet
BitSet Contain
BitSet Convert
BitSet Create
BitSet to
BitSet To Byte Array
BitSet to String
Bitwise And
Bitwise Not
Bitwise Or
Bitwise XOR
BlockingQueue
Boolean And
Boolean Array And
Boolean Array Convert to
Boolean Convert to
Boolean From
Boolean Invert
Boolean Parse
Boolean to Bit
Boolean to Byte
Boolean to Char
Boolean to Int
Boolean to Long
Boolean to Short
Boolean to String
Boolean Value From
Broadcast Address Get
Bubble Sort
BufferedImage Blur
BufferedImage Clip
BufferedImage Color
BufferedImage Color Set
BufferedImage Compare
BufferedImage Compress
BufferedImage Create
BufferedImage Crop
BufferedImage Deep Copy
BufferedImage Display
BufferedImage Encode
BufferedImage Equal
BufferedImage Filter
BufferedImage Flip
BufferedImage from Byte Array
BufferedImage from Image
BufferedImage from JPanel
BufferedImage from String
BufferedImage from URL
BufferedImage Height Get
BufferedImage Histogram
BufferedImage Invert
BufferedImage Load
BufferedImage Merge
BufferedImage Operation
BufferedImage Pixel
BufferedImage Read
BufferedImage Resize
BufferedImage Rotate
BufferedImage Save
BufferedImage Scale
BufferedImage Sharpen
BufferedImage Show
BufferedImage Size Get
BufferedImage Slice
BufferedImage Split
BufferedImage Subimage
BufferedImage Thumbnail
BufferedImage to Base64 String
BufferedImage to Byte Array
BufferedImage to Gray Scale
BufferedImage to Image
BufferedImage to ImageIcon
BufferedImage to InputStream
BufferedImage to JPEG

BufferedImage to PNG
BufferedImage to RGB
BufferedImage to Shape
BufferedImage to String
BufferedImage to Transparent
BufferedImage Transform
BufferedImage Transparent
BufferedImage Trim
BufferedImage Width Get
BufferedImage Zoom
BufferedInputStream Copy
BufferedInputStream Create
BufferedInputStream Read Line
BufferedInputStream to Byte Array
BufferedOutputStream Create
BufferedReader Copy
BufferedReader Create
BufferedReader Read
BufferedReader Read All
BufferedReader Read Line
BufferedReader to String
BufferedWriter Create
BufferedWriter Write
Byte And
Byte Array Add
Byte Array And
Byte Array Big Endian
Byte Array Clear
Byte Array Combine
Byte Array Compare
Byte Array Convert To
Byte Array Copy
Byte Array Copy Range
Byte Array Create
Byte Array Decode
Byte Array Decompress
Byte Array Dump
Byte Array Encode
Byte Array Equal
Byte Array from
Byte Array Little Endian
Byte Array Print
Byte Array Save to File
Byte Array Save to File nio
Byte Array Shorten
Byte Array to Base16
Byte Array to Base32
Byte Array to Base64
Byte Array to Binary
Byte Array to Boolean
Byte Array to BufferedImage
Byte Array to Char
Byte Array to Chinese
Byte Array to Double
Byte Array to DWord
Byte Array to Endian
Byte Array to Float
Byte Array to Hex
Byte Array to Hex String
Byte Array to Int
Byte Array to IP Address
Byte Array to Long
Byte Array to Object
Byte Array to Short
Byte Array to String
Byte Array to String by Charset
Byte Array to Unsigned Int
Byte Array Uncompress
Byte Array Value Set
Byte Clamp
Byte Convert From
Byte Create
Byte Flip
Byte Print
Byte to ASCII
Byte to Binary
Byte to Bit
Byte to Boolean
Byte to Boolean Array
Byte to Byte Array
Byte to Char

Byte to Double
Byte to Hex
Byte to Hex Char
Byte to Hex String
Byte to Int
Byte to Little Endian
Byte to Octal
Byte to Short
Byte to String
Byte to Unsigned Int
Byte Value Format
ByteArrayOutputStream Create
ByteArrayOutputStream Read Line
ByteArrayOutputStream Write
ByteArrayOutputStream Write Int
ByteArrayOutputStream Write Object
ByteBuffer Allocate
ByteBuffer Append
ByteBuffer Capacity
ByteBuffer Clean
ByteBuffer Clear
ByteBuffer Clone
ByteBuffer Compact
ByteBuffer Compare
ByteBuffer Compress
ByteBuffer Concatenate
ByteBuffer Contain
ByteBuffer Copy
ByteBuffer Create
ByteBuffer Decode
ByteBuffer Dump
ByteBuffer Endian
ByteBuffer Expand
ByteBuffer Extract
ByteBuffer Fill
ByteBuffer Flip
ByteBuffer from
ByteBuffer from Byte Array
ByteBuffer from FloatBuffer
ByteBuffer from Object
ByteBuffer from String
ByteBuffer from UTF
ByteBuffer Get
ByteBuffer Merge
ByteBuffer Print
ByteBuffer Put
ByteBuffer Read
ByteBuffer Resize
ByteBuffer Rewind
ByteBuffer Save
ByteBuffer Search
ByteBuffer Serialize
ByteBuffer Set
ByteBuffer Shift
ByteBuffer Size
ByteBuffer Skip
ByteBuffer Slice
ByteBuffer Split
ByteBuffer to Byte
ByteBuffer to Byte Array
ByteBuffer to CharBuffer
ByteBuffer to Double
ByteBuffer to Float
ByteBuffer to Hex
ByteBuffer to InputStream
ByteBuffer to Int
ByteBuffer to Int Array
ByteBuffer to Long
ByteBuffer to Long Array
ByteBuffer to Object
ByteBuffer to OutputStream
ByteBuffer to Short
ByteBuffer to Short Array
ByteBuffer to Stream
ByteBuffer to String
ByteBuffer to UTF
ByteBuffer Write
ByteOrder

C

Calendar Add
Calendar Adjust
Calendar Between
Calendar Calculate
Calendar Compare
Calendar Create
Calendar Day
Calendar Different
Calendar Format
Calendar from Date
Calendar Holiday
Calendar Hour
Calendar Millisecond
Calendar Minute
Calendar Month
Calendar Night
Calendar Parse
Calendar Second
Calendar Time
Calendar to Date
Calendar to String
Calendar to Time
Calendar Truncate
Calendar UTC
Calendar Week
Calendar Year
Canonical Path Create
Ceil
Celsius to Fahrenheit
Celsius to Kelvin
Certificate Read
Char Array Compare
Char Array Contain
Char Array Create
Char Array Equal
Char Array Escape
Char Array Index Of
Char Array Match
Char Array to Byte Array
Char Array to Char
Char Array to Double
Char Array to Double Array
Char Array to Entity
Char Array to Int
Char Array to Int Array
Char Array to Long
Char Array to String
Char Array to UTF
Char Array Value Check
Char Capitalize
Char Capitalized Check
Char Code Get
Char Convert To
Char Count

Collection Average
Collection Check
Collection Clear
Collection Combine
Collection Compare
Collection Concatenate
Collection Contain
Collection Convert
Collection Copy
Collection Count
Collection Create
Collection Difference
Collection Dump
Collection Element Get
Collection Empty
Collection Equal
Collection Find
Collection First
Collection Flatten
Collection Hash
Collection Intersect
Collection Join
Collection Last
Collection Max
Collection Mean
Collection Median
Collection Merge
Collection Min
Collection Minus
Collection Null
Collection Print
Collection Random Element
Collection Remove
Collection Reverse
Collection Search
Collection Serialize
Collection Size
Collection Sort
Collection Split
Collection Subset
Collection Subtract
Collection Sum
Collection to Array
Collection to List
Collection to String
Collection Union
Collection Unique
Color Alpha
Color Blend
Color Brighten
Color Brightness Get
Color Combine
Color Contrast
Color Convert To

D

Database Driver Load
Database Driver Name Get
DataInput Read Long
DataInputStream Create
DataInputStream Read
DataInputStream Read Line
DataInputStream Read Long
DataInputStream to Object
DataOutput Write Byte Array
DataOutput Write String
DataOutputStream Write Object
DataOutputStream Write String
DataSource
Date Add
Date Adjust
Date After
Date Before
Date Between
Date Calculate
Date Clear
Date Compare
Date Compare by Day
Date Compare by Hour
Date Compare by Month
Date Compare by Year
Date Convert
Date Create
Date Difference
Date Equal
Date Format
Date Format As
Date Format Change
Date Format Check
Date Format Guess
Date Format ISO
Date Format Pattern
Date from String
Date GMT Format
Date ISO Parse
Date Long Format
Date Now
Date Offset
Date Parse
Date Previous
Date RFC Format
Date Set
Date Start
Date String Format
Date String to String
Date Subtract
Date Time to String
Date to Calendar
Date to Day
Date to Instant
Date to LocalDate

Delete File or Directory
Delete File Recursively
Delete Folder
Delete Temp Directory
Delete Temp File
Delete Tree
Deque Usage
DES
Desktop
Desktop Directory
Desktop Path Get
Diagnostic to Output
Dictionary Usage
Digamma
Digest
Digest File
Digit From
Directory Check
Directory Clean
Directory Clear
Directory Copy
Directory Copy nio
Directory Create
Directory Create nio
Directory Delete
Directory Delete nio
Directory Delete on Exit
Directory Exist Check
Directory to File List
Disk Free Space Get
Distance between Point and Line
Distance between Points
Distance Calculate
Divisor
DNS
Double Array Convert
Double Array Create
Double Array Equal
Double Array to Byte Array
Double Array to Float Array
Double Array to Int Array
Double Array to Long Array
Double Array to Short Array
Double Array to String
Double Convert to
Double Number Align
Double Number Almost Equal
Double Number Between
Double Number Clamp
Double Number Clip
Double Number Create
Double Number Divide
Double Number Equal
Double Number Format
Double Number From

F

H

Hash Calculate
Hash Code Calculate
Hash String
HashMap Convert
HashMap Copy
HashMap Counter
HashMap Create
HashMap Reverse
HashMap Sort
HashMap to String
HashSet Create
Hashtable Create
Hex Calculate
Hex Convert To
Hex Dump
Hex Format
Hex Print
Hex String Create

Hex to Byte
Hex to Byte Array
Hex to Color
Hex to Int
Hex to Long
Hex to String
Hex to Unicode
HMAC
Host Address Get
Host Check
Host Name Get
Host Ping
Host Resolve
Hour
Hour Add
Hour Calculate
Hour Format
Hour Next

Hour to milliseconds
Hour to Second
HSL Color Convert
HSV Color to HSB
HSV Color to RGB Color
HTML
HTML Clean
HTML Create
HTML Decode
HTML Encode
HTML Entities
HTML Entity
HTML Escape
HTML Filter
HTML Jsoup Document
HTML Jsoup Element
HTML Parse Jsoup
HTML Sanitize

HTML to String
HTML to Text
HTML Unescape
HTTP Close
HTTP Date
HTTP Get
HTTP Get Json
HTTP Header
HTTP Port
HTTP Port Find
HTTP Post
HTTP Read
HTTP Request
HTTP Response
HTTP Response Code
HttpURLConnection Create
HttpURLConnection Open

I

InputStream Copy
InputStream Copy nio
InputStream Copy to File
InputStream Create
InputStream Deserialize to Object
InputStream Read
InputStream Read All
InputStream Read by Charset
InputStream Read by Encoding
InputStream Read Bytes
InputStream Read Line
InputStream Read Long
InputStream to Byte Array
InputStream to Char Array
InputStream to File
InputStream to Int
InputStream to OutputStream
InputStream to Reader
InputStream to String
InputStream to Temp File
InputStream to Text Line
InputStream to Writer
InputStream Type Check
InputStreamReader Create
InputStreamReader Read
InputStreamReader Read All
InputStreamReader Read Line
Insertion Sort
Instant Calculate
Instant Create
Instant Format
Instant Parse
Instant to
Instant to Date
Instant to String
Int to Byte Array
Int64 Convert
IntBuffer Create
Integer Align
Integer And
Integer Array Convert To
Integer Array Create
Integer Array Match
Integer Array Permutation
Integer Array to Binary
Integer Array to Byte Array

J

K

Kelvin To Celsius
Kelvin To Fahrenheit
Key Create

Key Pair Create
Key Public
Kill Process

Kilometer Convert to
KMH Convert
Knot to Meter Convert

L

M

O

Object Array Convert To
Object Array Create
Object Array to String
Object Clone
Object Compare
Object Convert to
Object Create
Object Deep Clone
Object Deep Copy
Object Deserialize
Object Deserialize from File
Object Equal
Object Hash

Object NVL
Object Save
Object Serialize
Object Serialize and Deserialize
Object Size
Object to Array
Object to Boolean
Object to Byte
Object to Byte Array
Object to ByteBuffer
Object to Char
Object to Double
Object to Float

Object to int
Object to Json
Object to Long
Object to Short
Object to String
Object to Type Name
Object Type Case
Object Value Of
ObjectInput Read Long
ObjectInputStream Read All
ObjectOutputStream Create
ObjectOutputStream Write
ObjectOutputStream Write Object

OffsetDateTime
OS is 64 Bit
OutputStream Create
OutputStream Write
OutputStream Write Byte Array
OutputStream Write Endian
OutputStream Write Int
OutputStream Write Long
OutputStream Write String
OutputStream Write Text
OutputStreamWriter Create
OutputStreamWriter Write

P

Preference Put
Preference Remove
Primitive Type Create
Printer Usage
PrintStream Create
PrintWriter Create
PrintWriter Print
PrintWriter Write
Properties
Properties Create
Properties Get
Properties Load
Properties Load from File
Properties Load from InputStream
Properties Parse
Properties Save
Properties to
Properties to Map
Properties to String

Q

QQ Number Check
Queue Create

Queue Usage
Quick Sort

R

S

Salt Value Create
Scanner Read
Scanner Read All
Scanner Read Line
Scanner Usage
Screen Capture
Screen Center
Screen Full Size
Screen Number
Screen Size
Screenshot
Script
Script Binding
Script Engine
Second
Second Add
Second Calculate
Second Compare
Second Convert
Second Format
Second Get
Second Parse
Second Round
Second to Milliseconds
Second to Minute
Security
Serializable Compare
Serializable Serialize
Serialize
Server Socket Create
Set Cardinality
Set Compare
Set Copy
Set Create
Set Difference
Set Intersect
Set Search
Set Sort
Set sub set
Set Super set
Set to
Set to Array
Set to ArrayList
Set to List
Set to String
Set Union
Setter Name Create
SHA
SHA1
SHA256
SHA512
Shell Command
Short Array Convert To
Short Number Array Create
Short Number Create
Short to Byte Array
Signature Check
sin
sin to cos
sinh
Size
Size Format
Sleep
Sleep for Second
slf4j Logger
SOAP Message
Socket Address Get
Socket Check
Socket Create
Socket Port
Socket Read
Socket Write
SocketChannel
SortedMap Type Check
SortedMap Usage
SortedSet
SortedSet Create
SortedSet Type Check
SortedSet Usage
Sound File
SQL Batch Execute
SQL Blob
SQL Callable Statement
SQL Clob
SQL Date
SQL Date Add
SQL Date Calculate
SQL Date Check
SQL Date Compare
SQL Date Convert
SQL Date Create
SQL Date Format
SQL Date From
SQL Date from Util Date
SQL Date Get
SQL Date Month

SQL Date Parse
SQL Date to String
SQL Date to Util Date
SQL Execute
SQL Key
SQL LocalDate
SQL PreparedStatement
SQL Query
SQL ResultSet
SQL ResultSet BigDecimal Read
SQL ResultSet Blob Read
SQL ResultSet Boolean Read
SQL ResultSet Byte Read
SQL ResultSet Clob Read
SQL ResultSet Close
SQL ResultSet Double Read
SQL ResultSet Dump
SQL ResultSet Float Read
SQL ResultSet Int Read
SQL ResultSet Long Read
SQL ResultSet Print
SQL ResultSet Read
SQL ResultSet Short Read
SQL ResultSet String Read
SQL ResultSet to
SQL Stored Procedure
SQL Table
SQL Table Column
SQL Table Create
SQL Table Drop
SQL Table Exist
SQL Table Index
SQL Time
SQL Time Calculate
SQL Time Create
SQL Time Field
SQL Time Format
SQL Time From
SQL Time Now
SQL Time Parse
SQL Type
SQL Unescape
SQL Update
SQL Warning
SQLException
SQLException to String
SQLWarning to String
sqr
Square
Square Calculate
Stack Append
Stack Create
Stack Peek
Stack Pop
Stack Push
Stack to
Stack Usage
Stacktrace
Stacktrace Print
Stacktrace to String
Standard Deviation Calculate
stddev
Stream Close
Stream Create
Stream Join
Stream of
Stream Operation
String Abbreviate
String Accent
String Align
String Align Center
String Align Left
String Align Right
String Anagram Solver
String Array Check
String Array Combine
String Array Merge
String Array to String
String Between
String Blur
String Break
String Camel Case
String Camel Case Format
String Camel Case To
String Camel Case to Snake Case
String Camel Case to Underscore
String Camel Case to Upper Case
String Camel to Hyphen
String Capitalize
String Capitalize All
String Capitalize First
String Capitalize Full
String Capitalize Word
String Capitalized Check
String Case Insert
String Case Swap

String Char Count
String Chomp
String Chop
String Chop at Word
String Chop Left
String Chop Right
String Clean
String Clip
String Clone
String Code Point
String Collapse
String Cut
String Decamel Case
String Decapitalize
String Decode
String Decode by Charset
String Decompress
String Dequote
String Descrypt
String Diacritics
String Difference
String Distance
String Divide
String Double Quote
String Ellipse
String Empty
String Empty to Null
String Encode
String Encode by Charset
String Encrypt
String Ends With
String Equal
String Escape
String Explode
String Extract
String Find
String Format
String from
String from List
String Hash
String Implode
String Indent Format
String Index Of
String Insert
String Java Encode
String Join
String Last Index Of
String Leading Character
String Left
String Left Align
String Left Justify
String Length Get
String Levenshtein Distance
String Line Count
String Line Separator
String Lower Case
String Match
String Match Count
String Multiply
String Normalize
String Occurence Count
String Pad Left
String Pad Right
String Pad Zero
String Parse
String Pascal Case
String Permutation
String Plural
String Pluralize
String Proper Case
String Quote
String Quote Unescape
String Remove
String Repeat
String Replace
String Reverse
String Sanitize
String Sentence Case
String Shorten
String Single Byte Check
String Single Quote
String Singularize
String Slash
String Slice
String Slugify
String Snake Case
String Split
String Split by Case
String Split by Char
String Split by Comma
String Split by Delimiter
String Split by Length
String Split by Line
String Split by Quote
String Split by Regex
String Split by Separator

String Split by Space
String Split by Word
String Start With
String Starts Wtih
String Strip
String Sub String
String Substitute
String Substring Count
String Substritute
String Suffix
String Tail
String Title Case
String to
String to Array
String to Boolean
String to Byte Array
String to Chinese Big5
String to Chinese GB2312
String to Date
String to DBC
String to Double
String to Float
String to Hex
String to Int
String to Int Array
String to List
String to Long
String to Map
String to Octal
String to SBC
String to Short
String to StringReader
String to Time
String to Timestamp
String to Unicode
String Tokenize
String Translate
String Trim Left
String Trim Right
String Truncate
String Uncapitalize
String Underscore
String Underscore to
String Unescape
String Unpad
String Unquote
String Upper Case
String Value Of
String Whitespace Clean
String Whitespace Collapse
String Whitespace Delete
String Whitespace Normalize
String Wrap
String XOR Decode
String XOR Encode
StringJoiner Usage
StringReader Create
Swing 3D Border
Swing ActionMap
Swing Bevel Border
Swing Border
Swing BorderLayout
Swing BoxLayout
Swing Cursor
Swing Document Get Char
Swing Empty Border
Swing Etched Border
Swing FlowLayout
Swing Focus
Swing Font
Swing Font Change
Swing Font Height
Swing Font Metrics
Swing Font Set
Swing Font Size
Swing Font Width
Swing GridLayout
Swing HTML
Swing Icon
Swing Key Action
Swing Key Event
Swing KeyStroke
Swing LineBorder
Swing Look and Feel
Swing Menu
Swing Menu Item
Swing Mouse
Swing RTF
Swing SpringLayout
Swing Text Format
Swing Text Style
Swing TitledBorder
Swing Tooltip
Swing UI Thread Event
Swing UIManager

T

U

X

X500Principal
XHTML Process
XML Attribute Add
XML Attribute Append
XML Attribute By QName
XML Attribute Copy
XML Attribute Create
XML Attribute Delete
XML Attribute Exist
XML Attribute from Element
XML Attribute from Node
XML Attribute Get
XML Attribute Load
XML Attribute Merge
XML Attribute Namespace
XML Attribute Parse
XML Attribute Print
XML Attribute Read
XML Attribute Remove
XML Attribute Replace
XML Attribute Set
XML Attribute Sort
XML Attribute to Map
XML Base64 Encode Decode
XML CData
XML CDATA Add
XML CDATA Append
XML CDATA Get
XML Child Element Add
XML Child Element Attribute
XML Child Element By QName
XML Child Element Create
XML Child Element Text
XML Child Get
XML Child Get by Name
XML Child Get by Namespace
XML Child Get by Type
XML Child Insert
XML Child Node Get
XML Child Remove
XML Child Remove All
XML Comment
XML Data Type Converter
XML Date
XML Date Create

XML Date to
XML Document Clone
XML Document Create
XML Document Format
XML Document from File
XML Document from Stream
XML Document from String
XML Document from URL
XML Document Parse
XML Document Print
XML Document Save to File
XML Document Serialize
XML Document to Byte Array
XML Document to File
XML Document to Stream
XML Document to String
XML Document to Writer
XML Document Transform
XML DocumentBuilder Create
XML DOM from File
XML DOM from String
XML DOM Parse
XML DOM Print
XML DOM to String
XML Duration Add
XML Element Check
XML Element Child Append
XML Element Children
XML Element Create
XML Element Find
XML Element First
XML Element from String
XML Element Get
XML Element Get by Attribute
XML Element Get by ID
XML Element Get by Name
XML Element Get from Parent
XML Element Get Value
XML Element Namespace
XML Element Print
XML Element Remove
XML Element Root
XML Element Set
XML Element Sibling
XML Element Text

Y

Year
Year Ago
Year Current
Year Day

Year Format
Year From
Year Get
Year Month

Year Parse
Year to String
Year Week
Yesterday