Can create the getter and setter method private? - Stack ...
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2) The reason that you can do it is because the Java Language Specification says ... The class properties must be accessible using get, set, ...
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Cancreatethegetterandsettermethodprivate?
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Cancreatethesetterandgettermethodprivate?Ifyesornowhy?
java
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askedAug22,2011at5:39
BoomirajPBoomirajP
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Youareaskingwhethergetterandsettercanbemadeprivateoryouwanttoknowthepros-andconsofmakinggetterandsettersasprivatemethods?
– Swagatika
Aug22,2011at5:41
Onlyaskingcancreatethegetterandsetterprivate?
– BoomirajP
Aug22,2011at5:43
Yes,youcan.Thereisnorestrictiononthat.
– Swagatika
Aug22,2011at5:44
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Generallymakingsettersasprivatemethodsisoneofthemanywaysofmakingimmutableobjects.
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answeredAug22,2011at5:43
SwagatikaSwagatika
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Whyevenmakeasetterthen,whenanycodethatcancallthesettercandirectlymodifytheprivatevariableaswell,andoverrideanysortofchecksthesettermightmake.
– Paul
Aug22,2011at5:48
Youwillprobablyloosethechecksthesetters/gettersmightdo,modifyingthestatevariabledirectly.Privatesetter/getteristhoughtfulsolutiononlyforthesekindsofadditionalchecks.
– panzerschreck
Aug22,2011at6:10
IfIwantedtomakeanobjectimmutable,Iwould(amongotherthings)makeitspropertiesfinal.Thenitcouldnothaveasettermethod.
– emory
Aug22,2011at7:10
@Enomy:Yeahthat'sanotherstrategyofmakingimmutableobjectsbycreatingfinalandprivatefields.
– Swagatika
Aug22,2011at8:19
Declaringallsettersprivateisnotsufficienttomakeanobjectimmutable.Ifyouhaveanysetters(publicorprivate)youalsoneedsomeschemetopreventthesetterfromchangingtheobjectstateaftertheobjectbecomesimmutable.
– StephenC
Jan16,2013at9:50
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Cancreatethesetterandgettermethodprivate?Ifyesornowhy?
1)Yesyoucandoit.
2)ThereasonthatyoucandoitisbecausetheJavaLanguageSpecificationsaysyoucan.AsfarastheJLSisconcerned,thereisnothinglinguisticallydifferentbetweengetterandsettermethodsandanyothermethods.Andanymethodcanbedeclaredasprivate.
Yourunstatedquestioniswhyyouwoulddoit.Andthereasonissimple:tohidethemethodsfromuseoutsideoftheclass.Andwhymightyoudothat?Here'satypicaluse-case:
Wewanttocombinesomelogic(inthiscaseenforcingofaconstraint)withthesetting(orgetting)ofanattribute,butwedon'twantthesetter(orgetter)tobevisible:
publicclassFoo{
privateFooparent;//thismustnotchangeonceithasbeenset
....
privatevoidsetParent(Fooparent){
if(this.parent!=null){
thrownewSomeException(...);
}
this.parent;
}
}
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answeredAug22,2011at7:03
StephenCStephenC
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Youcandoit,butthereishardlyapoint.Ifthosemethodsareprivatethenanycodethatcancallthosemethodscanalsoaccesstheobjectspropertiesdirectly.
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answeredAug22,2011at5:41
PaulPaul
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Iassumethatanycodethatcancallthosemethodsisundermycontrol.IchoosehowtoaccestheobjectspropertiesandIcanchoosetowriteasetter/getterconveniencemethodtosavemyselfthetroubleofrepeatingthesamecodeoverandoveragain.
– emory
Aug22,2011at7:06
Ihavecreatedacounterexample-stackoverflow.com/questions/7143564/…-wheresomecodethatcouldaccessthesetter/gettermethodscouldnotaccesstheobjectspropertiesdirectly.Admittedly,itstillseemspointless.
– emory
Aug22,2011at7:08
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Yes,gettersandsetterscanbemadeprivate.IfyouwanttocreateaJavaBean,thenaprivategetter/setterfailstheJavaBeanscriteria,whichstates:
Theclasspropertiesmustbeaccessibleusingget,set,is(usedfor
booleanpropertiesinsteadofget)andothermethods(so-called
accessormethodsandmutatormethods),followingastandard
naming-convention.Thisallowseasyautomatedinspectionandupdating
ofbeanstatewithinframeworks,manyofwhichincludecustomeditors
forvarioustypesofproperties.
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answeredAug22,2011at5:49
BuhakeSindiBuhakeSindi
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Thereisnoreasonwhyyoucannotmakegettersandsettersprivate.
Whywouldyoudothis?Ifthesettermethodmodifiedapropertyindirectly.Forexample,ifyourcircleclasshadaradiusproperty,thenyoucouldhavesetRadius,setDiameter,setCircumference,setAreamethodsandyoucouldchoosetomakethesemethodsprivate.
Infact,ifyouinsertsomeconvolutedcode,youcanhavecodethatcancallthesesetter/gettermethodsthatcannotmodifythepropertiesdirectly(withoutusingreflection).Butitissufficientlyconvolutedthatitseemshardlyworththetrouble.
/**
*Thisconvolutedclasswillnotworkcorrectlyunlesstheline"this.xRef.set(x)"isline10andtheline"x=this.xRef.get();"isline23
**/
classPrivate
{
privatevoidsetX(intx)
{
try
{
this.xRef.set(x);
}
catch(IllegalAccessExceptioncause)
{
assertfalse;
}
}
privateintgetX()
{
intx;
try
{
x=this.xRef.get();
}
catch(IllegalAccessExceptioncause)
{
x=0;
assertfalse;
}
returnx;
}
privatefinalReference
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