Peb puas tuaj yeem muab cov niam txiv cov khoom rau cov khoom me me hauv Java?
Peb puas tuaj yeem muab cov niam txiv cov khoom rau cov khoom me me hauv Java?

Video: Peb puas tuaj yeem muab cov niam txiv cov khoom rau cov khoom me me hauv Java?

Video: Peb puas tuaj yeem muab cov niam txiv cov khoom rau cov khoom me me hauv Java?
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Anonim

Niam txiv thiab Me nyuam cov chav kawm muaj tib cov ntaub ntawv tus tswv cuab hauv Java . Cov ntaub ntawv sib txawv ntawm cov Niam txiv chav kawm muaj peev xwm tuav nws khoom siv raws li nws tus menyuam yam khoom siv. Cov ntaub ntawv tuav lub tus menyuam chav kawm khoom siv yuav tsis tuaj yeem nkag mus rau cov tswv cuab (functions lossis variables) ntawm cov tus menyuam chav kawm.

Hais txog qhov no, puas muaj peev xwm muab ib qho khoom ntawm ib hom me nyuam rau qhov sib txawv ntawm hom niam txiv piv txwv?

Tsis yog-tab sis a khoom ntawm niam txiv hom tau ua muab rau qhov sib txawv ntawm hom menyuam.

Peb puas tuaj yeem muab cov khoom superclass rau subclass? Tsis yog. Nws ua rau xoom qhov tso cai rau qhov ntawd. Qhov laj thawj yog vim li cas subclass feem ntau txhais tus cwj pwm ntxiv. Yog koj muab tau a superclass khoom rau a subclass siv, koj yuav khiav mus rau hauv cov teeb meem ntawm runtime thaum koj sim nkag mus rau cov tub kawm uas tsis muaj nyob.

Tom qab ntawd, lo lus nug yog, cov menyuam kawm ntawv puas tuaj yeem tsim cov khoom ntawm niam txiv chav kawm?

Hauv cov ntsiab lus yooj yim, Yam khoom ntawm niam txiv chav kawm tau tuav khoom ntawm cov menyuam kawm ntawv . Rov qab ua tau tsis muaj tseeb.

Ib yam khoom puas tuaj yeem faib lwm yam khoom?

Ua tau ib khoom ntawm a subclass nkag mus tiv thaiv teb ntawm lwm yam khoom ntawm lwm subclass ? Muaj qee zaus, txawm li cas los xij, thaum koj xav txwv ib txoj hauv kev subclass tsuas yog los yog, tsawg dua, tso cai subclass txoj kev nkag mus rau ib qho chaw superclass. Nyob rau hauv tas li ntawd, koj tshaj tawm ib chav kawm feature raws li kev tiv thaiv.

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