Java String Encoding - Javatpoint

In Java, when we deal with String sometimes it is required to encode a string in a specific character set. Encoding is a way to convert data from one format to ... ⇧SCROLLTOTOP Home Java Programs OOPs String Exception Multithreading Collections JavaFX JSP Spring SpringBoot Projects InterviewQuestions JavaTutorial WhatisJava HistoryofJava FeaturesofJava C++vsJava HelloJavaProgram ProgramInternal Howtosetpath? 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Note:ItisnotpossibletoencodeastringinUTF-8.So,useeitherByteBufferorcallanarrayonittogetabyte[]. Beforemovingaheadinthissection,wehavetounderstandcharacterencoding.Let'shaveaquicklook.Let'sunderstandwhyweneedtoencodeastring. Characterencodingisatechniquetoconverttextdataintobinarynumbers.Wecanassignuniquenumericvaluestospecificcharactersandconvertthosenumbersintobinarylanguage.Thesebinarynumberslatercanbeconvertedbacktooriginalcharactersbasedontheirvalues. Problem Suppose,wehaveGermanstringTschüssanditisrequiredtoencodeit.Considerthefollowingcodesnippet: Stringstr="Tschüss"; byte[]bytesOfString=str.getBytes(); Stringencoded_String=newString(bytesOfString,StandardCharsets.US_ASCII);assertNotEquals(encoded_String,str); IfweencodethestringbyusingtheUS_ASCII,itgivestheTsch?ssbecausetheUS_ASCIIencodingdoesnotunderstandthenon-ASCIIcharacter(ü).WhenweconvertanASCIIencodedstringtoUTF-8,wegetthesamestring. Stringstr="GoodBye"; byte[]bytesOfString=str.getBytes(); StringasciiEncondedEnglishString=newString(bytesOfString,StandardCharsets.US_ASCII); assertEquals(encoded_String,str); Ifabyte[]arraycontainsnon-Unicodetext,wecanconvertthetextintoUnicodewithStringconstructor.Conversely,wecanalsoconvertaStringobjectintoabyte[]arrayofnon-UnicodecharacterswiththeString.getBytes()method.Let'sencodethestringbyusingthegetBytes()method. UsingString.getBytes()Method JavaStringclassprovidesthegetBytes()methodthatisusedtoencodesstringintoUTF-8.Themethodconvertsthestringintoasequenceofbytesandstorestheresultintoanarray. Syntax: publicbyte[]getBytes(StringcharsetName)throwsUnsupportedEncodingException ItparsescharsetNameasaparameterandreturnsthebytearray.ItthrowstheUnsupportedEncodingExceptionifthenamedcharsetisnotsupported. Let'screateaJavaprogramthatconvertsastringintoUTF-8encoding. StringEncodingExample.java publicclassStringEncodingExample { publicstaticvoidmain(Stringargs[])throwsException { //stringtoencode Stringstr="GoogleCloud"; //invokesthegetBytes()methodandstoresanarrayofbytesintoarray[] bytearray[]=str.getBytes("UTF8"); System.out.println("EncodedString:"); //enhancedforloopthatiteratesoverthearray for(bytex:array) { //printsthesequenceofbytes System.out.print(x+""); } } } Output: EncodedString: 711111111031081013267108111117100 UsingStandardCharsetsClass WecanalsousetheStandardCharsetclasstoencodethestring.Therearetwostepstoencodethestring.First,decodethestringintobytesandthenencodeitintoUTF-8.Forexample,considerthefollowingcode: Stringstr="Tschüss"; ByteBufferbuffer=StandardCharsets.UTF_8.encode(str); Stringencoded_String=StandardCharsets.UTF_8.decode(buffer).toString();assertEquals(str,encoded_String); AnotherwaytoencodeastringistousetheBase64encoding.WewilldiscusstheBase64encodinganddecodinginthecomingsection. 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