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1、SCJPStudyNotes:Chapter1DeclarationsandAccessControlChapter1DeclarationsandAccessControl1.IdentifiersandJavaBean1.1LegalIdentifiersMuststartwithaletter,$or_,CAN’TstartwithnumberLegal:_a,$c,__2_w,_$Illegal::b,-d,e#,.f,7gJavaKeywordabstractbooleanbreakbytecasecatchcharclassconstcontinuedefaul
2、tdodoubleelseextendsfinalfinallyfloatforgotoifimplementsimportinstanceofintinterfacelongnativenewpackageprivateprotectedpublicreturnshortstaticstrictfpsuperswitchsynchronizedthisthrowthrowstransienttryvoidvolatilewhileassertenum1.2JavaBeansStandardsJavaBeans=>helpJavadevelopercreatecompone
3、nt=>classthathaveproperties1.JavaBeanPropertyNamingRule-ifnotBoolean,gettermethodprefixmustbe‘get’,e.g.getSize()-ifboolean,getStopped()orisStopped()-settermethodprefixmustbe‘set’,e.g.setSize()-settermethodmustmarked‘public’withvoidreturntype,witharg.Representpropertyvalue-gettermethodmustm
4、arked‘public’withnoarg,returntypematchargtypeofsettermethod2.JavaBeanListenerNamingRule-registerlistenerprefixwith‘add’,eg.AddActionListener()-unreg=>‘remove’-Listenermethodnamemustendwith“Listener”E.g.validJavaBeanSignature:publicvoidsetMyValue(intv)publicintgetMyValue()publicBooleanisMyS
5、tatus()publicvoidaddMyListener(MyListenerm)publicvoidremoveMyListener(MyListenerm)E.g.InvalidJavaBeanSignature:voidsetCustomer(Strings)//mustbepublicpublicvoidmodfiyMyValue(intv)//can’tuse‘modify’publicvoidaddXListener(MyListenserm)//MismatchPage8of8SCJPStudyNotes:Chapter1DeclarationsandAc
6、cessControl2.DeclareClasses2.1SourceFileDeclarationRules-therecanbeONLYONEpublicclasspersrc.file-package,import,class-afilecanhavemorethan1non-publicclass2.2ClassDeclarationandModifiersAccessmodifier:public,protected,private,default(packageaccess)Non–accessmodifier:strictfp,final,abstractP
7、ublic=>allpackagecanaccess,stillneedtoimportitFinal=>can’tbesubclassedAbstractclass=>can’tbeinstantiatedabstractclassCar{privatedoubleprice;publicabstractvoidgoFast();//endwith‘;’insteadof{}}3.DeclareInterfaceInterface=>acontractforwhataclasscandow/osayinghowi
