Koj ua li cas siv chav kawm paub daws teeb meem hauv Java?
Koj ua li cas siv chav kawm paub daws teeb meem hauv Java?

Video: Koj ua li cas siv chav kawm paub daws teeb meem hauv Java?

Video: Koj ua li cas siv chav kawm paub daws teeb meem hauv Java?
Video: Yuav tawm ntawm txoj kev txom nyem tau li cas? 2024, Kaum ib hlis
Anonim

Yog ib chav kawm tau tshaj tawm abstract , nws tsis tuaj yeem instantiated. Yuav siv ib chav kawm abstract , koj yuav tsum tau txais nws los ntawm lwm tus chav kawm , muab kev siv rau cov abstract txoj kev hauv nws. Yog tias koj tau txais ib qho chav kawm abstract , koj yuav tsum muab kev siv rau txhua tus abstract txoj kev hauv nws.

Tsis tas li ntawd, peb puas tuaj yeem siv cov chav kawm paub daws teeb meem hauv Java?

Abstract class in java can tsis tau instantiated. Yog chav kawm abstract tsis muaj txoj hauv kev kev siv , nws zoo dua los siv interface vim java ua tsis txhawb ntau chav kawm qub txeeg qub teg. Lub subclass ntawm abstract class in java yuav tsum siv tag nrho cov abstract txoj kev tshwj tsis yog cov subclass kuj yog ib qho chav kawm abstract.

Tom qab ntawd, lo lus nug yog, koj puas yuav tsum siv txhua txoj hauv kev ntawm chav kawm paub daws teeb meem? Koj tsis txhob yuav tsum tau siv txhua txoj hauv kev ntawm chav kawm paub daws teeb meem . Tab sis koj yuav tsum ua txhua yam kev paub daws teeb meem ntawm nws. Qhov tseeb extending ib chav kawm abstract tsis muaj qhov sib txawv ces txuas ib txwm chav kawm . Nws tsis zoo li kev ua interfaces.

Ib yam li ntawd, lub hom phiaj ntawm cov chav kawm abstract hauv Java yog dab tsi?

A Java abstract class yog a chav kawm uas tsis tuaj yeem instantiated, txhais tau tias koj tsis tuaj yeem tsim cov xwm txheej tshiab ntawm ib qho chav kawm abstract . Cov lub hom phiaj ntawm ib chav kawm abstract yog ua raws li lub hauv paus rau subclasses.

Dab tsi yog chav kawm abstract thiab txoj hauv kev hauv Java?

Java Abstract Classes thiab Methods Abstract class : yog txwv chav kawm uas tsis tuaj yeem siv los tsim khoom (kom nkag mus rau nws, nws yuav tsum tau txais los ntawm lwm tus chav kawm ). Abstract method : tsuas yog siv tau rau hauv ib qho chav kawm abstract , thiab nws tsis muaj lub cev. Lub cev yog muab los ntawm subclass (kwv yees los ntawm).

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