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Calendar chav kawm hauv Java yog dab tsi?
Calendar chav kawm hauv Java yog dab tsi?

Video: Calendar chav kawm hauv Java yog dab tsi?

Video: Calendar chav kawm hauv Java yog dab tsi?
Video: Yog ntuj tsis pab ntshe kuv tuag lawm 8/6/2018 2024, Kaum ib hlis
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Calendar chav kawm hauv Java yog abstract chav kawm uas muab txoj hauv kev rau hloov hnub 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. Daim ntawv qhia hnub . getInstance(): rov a Daim ntawv qhia hnub piv txwv raws li lub sij hawm tam sim no nyob rau hauv lub default timezone nrog lub default locale.

Ib yam li ntawd, koj ua li cas rau daim calendar hauv Java?

Java Calendar Class Piv txwv

  1. import java.util. Calendar;
  2. Public class CalendarExample1 {
  3. public static void main(String args) {
  4. Calendar calendar = Calendar.getInstance();
  5. System.out.println("Hnub tam sim no yog: " + calendar.getTime());
  6. calendar.add(Calendar. DATE, -15);

Tsis tas li ntawd, Calendar getInstance () yog dab tsi? Cov getInstance() txoj hauv kev Daim ntawv qhia hnub chav kawm yog siv kom tau a daim ntawv qhia hnub siv lub sijhawm tam sim no thiab thaj chaw ntawm qhov system. Rov qab Tus Nqi: Cov txheej txheem rov qab los daim ntawv qhia hnub.

Ib sab saum toj 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 yuav tsum tau muab rho tawm.

Dab tsi yog qhov txawv ntawm hnub thiab daim ntawv qhia hnub hauv Java?

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.

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