综合文案高级java iishyh-kang jeng09.pptx

AdvancedJava(II)Shyh-KangJengDepartmentofElectricalEngineering/GraduateInstituteofCommunicationEngineeringNationalTaiwanUniversity

ReferencesPatrickNaughtonandHerbertSchildt,TheCompleteReferenceJava2,3rded.,McGraw-Hill,1999.MerlinHughes,MichaelShoffner,DerekHamner,withUmeshBellur,JAVANetworkProgramming,2nded.,Manning,1999.

SimpleTypeWrapperSimpledatatypesarepassedbyvaluetomethodsandcannotbedirectlypassedbyreferenceAttimeswewillneedtocreateanobjectrepresentationforoneofthesimpletypesTostoreasimpletypeinanobjectform,wewillneedtowrapitinaclass

AbstractClassNumberClassNumberdefinesasuperclassthatisimplementedbytheclassesthatwrapbyte,short,int,long,float,anddoubleSomeabstractmethodsdoubledoubleValue()floatfloatValue()intintValue()longlongValue()

ClassDouble(1)ConstructorsDouble(doublenum)SomeconstantsMAX_VALUE,MIN_VALUENaNPOSITIVE_INFINITY,NEGATIVE_INFINITY

ClassDouble(2)SomemethodsdoubledoubleValue()intintValue()longlongValue()booleanequals(Objectobj)booleanisInfinite()booleanisNaN()StringtoString()staticDoublevalueOf( Stringstr)

ClassIntegerSomemethodsdoubledoubleValue()intintValue()staticStringtoHexString( intnum)staticStringtoOctalString( intnum)staticIntegervalueOf( Stringstr)ConvertingaStringtointstaticintparseInt(Stringstr)

ClassCharacterSomemethodscharcharValue()staticbooleanisDigit(charch)staticbooleanisLetter(charch)staticbooleanisLowerCase( charch)staticbooleanisSpace(charch)staticchartoLowerCase(charch)staticchartoUpperCase(charch)

ClassMath(1)Constants:EandPISomemethodsstaticdoublesin(doublearg)staticdoubleatan2(doublex, doubley)staticdoubleexp(doublearg)staticdoublelog(doublearg)staticdoublepow(doubley, doublex)staticdoublesqrt(doublearg)

ClassMath(2)Somemoremethodsstaticintabs(intarg)staticdoubleabs(doublearg)staticdoublemax(doublex,