Cov txheej txheem:
Video: Kuv yuav import ib daim ntawv qhia hnub rau Java li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
Java Calendar Class Piv txwv
- import java .util. Daim ntawv qhia hnub ;
- Public class CalendarExample1 {
- public static void main(String args) {
- Daim calendar = Daim ntawv qhia hnub .getInstance();
- System.out.println("Hnub tam sim no yog: " + daim ntawv qhia hnub .getTime());
- daim ntawv qhia hnub .add( Daim ntawv qhia hnub . HMOOB, -15);
Ntawm no, Calendar Add hauv Java yog dab tsi?
Daim ntawv qhia hnub ntxiv () Txoj kev hauv Java nrog piv txwv The ntxiv (int field, int amt) txoj kev ntawm Daim ntawv qhia hnub chav kawm yog siv rau ntxiv los yog rho tawm ntawm qhov muab daim ntawv qhia hnub field(int field), ib lub sij hawm tshwj xeeb (int amt), raws li qhov daim calendar txoj cai. amt: Qhov no yog hom integer thiab hais txog lub sijhawm uas yuav tsum tau muab rho tawm.
Tom qab ntawd, lo lus nug yog, qhov txawv ntawm hnub thiab daim ntawv qhia hnub hauv Java yog dab tsi? Cov ntaub ntawv yooj yim txog Daim ntawv qhia hnub chav kawm yog muab los ntawm Java API. Cov Daim ntawv qhia hnub chav kawm yog hnub, hli thiab xyoo. Cov Qhov sib txawv ntawm Hnub thiab Daim Ntawv Teev Npe yog tias Hnub tim chav kawm ua haujlwm nrog tshwj xeeb instant hauv lub sijhawm thiab Daim ntawv qhia hnub ua haujlwm nrog qhov sib txawv ntawm ob hnub tim.
Hauv qhov no, kev siv daim ntawv qhia hnub hli hauv Java yog dab tsi?
Calendar Class hauv Java nrog piv txwv. Calendar chav kawm hauv Java yog abstract chav kawm uas muab txoj hauv kev rau hloov hnub nruab nrab ntawm ib qho instant hauv lub sij hawm thiab ib txheej ntawm daim ntawv qhia hnub teb xws li MONTH, YEAR, HOUR, thiab lwm yam. Nws txais cov khoom qub chav kawm thiab siv qhov sib piv, Serializable, Cloneable interfaces.
Tus qauv twg koj pom hauv cov cai hauv qab no Java Util daim ntawv qhia hnub getInstance ();?
Cov getInstance () belongs rau lub Hoobkas qauv , uas txhais tau tias Daim ntawv qhia hnub yog lub Hoobkas. Factory txoj kev feem ntau pib nrog newXYZ() thaum ib tug singleton feem ntau muaj cov getinstance () txoj kev. Hauv koj qhov piv txwv, DataTypeFactory yog, qhov tseeb, lub Hoobkas.
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