Video: Lo lus tseem ceeb kawg hauv OOPs yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Thaum ib chav kawm tau tshaj tawm nrog lo lus tseem ceeb kawg , npe a kawg chav kawm. A kawg chav kawm tsis tuaj yeem txuas ntxiv (kwv yees). Lwm yam kev siv kawg nrog cov chav kawm yog los tsim cov chav kawm tsis hloov pauv xws li chav kawm String predefined. Koj tsis tuaj yeem ua ib chav kawm tsis hloov tsis tau ua kawg.
Tsis tas li ntawd, kev siv lo lus tseem ceeb kawg yog dab tsi?
kawg ( Java ) hauv Java programming lus, lo lus tseem ceeb kawg yog siv nyob rau hauv ob peb lub ntsiab lus los txhais ib qho chaw uas tsuas yog muab ib zaug xwb. Thaum ib qho kev hloov pauv zaum kawg tau raug muab, nws ib txwm muaj tib tus nqi.
Tsis tas li ntawd, lub ntsiab lus ntawm chav kawm kawg thiab txoj kev zaum kawg yog dab tsi? Kev sau ntawv Cov chav kawm kawg thiab Cov txheej txheem . Koj tuaj yeem tshaj tawm qee lossis tag nrho ntawm ib chav kawm txoj kev zaum kawg . Koj siv lub kawg keyword hauv a txoj kev tshaj tawm los qhia tias cov txoj kev tsis tuaj yeem overridden los ntawm subclasses. Yam khoom chav kawm ua qhov no-ib tus lej ntawm nws txoj kev yog kawg . A chav kawm uas tau tshaj tawm kawg tsis tuaj yeem raug subclass.
Ib yam li ntawd, chav kawm kawg hauv oops yog dab tsi?
Qib kawg : A chav kawm uas txhais tau tias chav kawm kawg tsis tuaj yeem tau txais txiaj ntsig ntxiv. Txhua Txoj Kev A chav kawm kawg yog nyob rau hauv kawg thiab yuav tsum tsis txhob tshaj tawm tias kawg hauv chav kawm txhais. Yog tsuas yog ib txoj kev ntawm a chav kawm yog kawg ces qhov ntawd chav kawm tuaj yeem tau txais qub txeeg qub teg tab sis txoj kev ntawd tsis tuaj yeem rov txhais dua.
Dab tsi yog lo lus tseem ceeb kawg hauv PHP nrog piv txwv?
Lo lus tseem ceeb kawg tiv thaiv menyuam chav kawm los ntawm overriding ib txoj kev los ntawm prefixing lub ntsiab lus nrog zaum kawg. Nws txhais tau tias yog peb txhais ib txoj kev nrog zaum kawg ces nws txwv tsis pub peb override txoj kev. <? php ib chav kawm A { final function show($x, $y) { $sum=$x+$y; echo "Sum of given no=".
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