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SCJPStudyNotes:Chapter10Development

Chapter10Development

1.UsingthejavacandjavaCommands

1.1Compilingwithjavac

Intheexam,youneedtounderstand–classpathand–doption

javac[options][sourcefiles]

javac-help

-classpathoption
javac-classpathcom:.-gFoo.javaBar.java

-doption(assumenopackagestatement)
MyClass.class
currentdirectory


javac-dclassessource/MyClass.java
tellthecompilertoputthe.classfiletoclassesdir
=>d(destination)

-doptionwithpackagestatement
currentdirectory


packagecom.wickedlysmart;
publicclassMyClass{}

javac-d../classescom/wickedlysmart/MyClass.java
Ifcom/wickedlysmartnotexist,the-doptionwillbuildit.
Butifclassesdirnotexist=>ERROR


1.2LaunchingApplicationswithjava

java[options]class[args]

java-DmyProp=myValueMyClassx1
CreateasystempropertycalledmyPropandsetitsvaluetomyValue
thevaluepairisretrievedinSystem.getProperties()

java-DcmdProp="cmdValtake2"TestProps	//ifthevaluecontainspace

CommandLineArguments
LegalDeclaration:
staticpublicvoidmain(String[]args)
publicstaticvoidmain(String...x)
staticpublicvoidmain(Stringbang_a_gong[])

args[0],args[1],…ifaccessargs[1]withouttheactualarg=>ArrayIndexOutofBound

1.3SearchingforOtherClasses

Bothjavaandjavacusethesamesearchalgorithm
thefirstplacetheylookatthedirectorycomestandardwithJ2SE
thesecondplaceisthedirectorydefinedbyclasspath
classpathcanbedefinedinOSenvvarorincommandlineinjavaandjavac
commandlineoverridetheenvvar

e.g.–classpath/com/foo/acct:/com/foo
thesearchpathisseparatedby“:”,“/”meansrootdirectory
notedthatsubdirectory,e.g./comwillNOTbesearched
inwindows,use“;”and“\”
canuse-cp

e.g.-classpath/com/foo/acct:/com/foo:.
“.”=>searchalsothecurrentdirectory

PackagesandSearching

packagecom.foo;
publicclassMyClass{publicvoidhi(){}}

importcom.foo.MyClass;
importcom.foo.*;
publicclassAnother{
	voidgo(){
		MyClassm1=newMyClass();			//aliasname
		com.foo.Myclassm2=newcom.foo.MyClass();	//fullname
	}
}

RelativeandAbsolutePaths



e.g.-cpdirB:dirB/dirC
dirBanddirB/dirCarerelativepaths(theydon'tstartwit