Ib tus cim yog ib ntu ntawm ib lossis ntau tus cim. Thawj tus cim yuav tsum yog thawj tus cim siv tau (tsab ntawv, $, _) hauv tus cim ntawm Java programming lus, tom qab ntawd hauv tshooj no hu ua "Java".
Tus cim nrog piv txwv yog dab tsi?
Ib tus cim yog tsis muaj dab tsi tab sis lub npe tau muab rau lub ntsiab lus hauv qhov kev pab cuam. Piv txwv li, lub npe ntawm qhov sib txawv, muaj nuj nqi, thiab lwm yam. Cov cim hauv C yog cov neeg siv cov npe uas suav nrog 'C' tus qauv txheej txheem. Raws li lub npe hais, cov cim qhia tau siv los txheeb xyuas cov ntsiab lus tshwj xeeb hauv qhov program.
Dab tsi yog tus cim hauv Java nrog piv txwv?
Ib tus lej siv tau yuav tsum muaj cim [A-Z] lossis [a-z] lossis tus lej [0-9], thiab kos npe (_) lossis kos npe duas ($). Piv txwv li, @javatpoint tsis yog tus cim siv tau vim nws muaj cov cim tshwj xeeb uas yog @. Yuav tsum tsis txhob muaj qhov chaw nyob hauv tus cim. Piv txwv li, java tpoint yog tus cim tsis raug.
koj txhais li cas los ntawm tus lej?
Ib tus cim yog lub npe uas txheeb xyuas (uas yog, sau cov cim ntawm tus kheej)yog ib qho khoom tshwj xeeb lossis ib chav tshwj xeeb ntawm cov khoom, qhov "khoom" lossis chav kawm yuav ua ib lub tswv yim, lub cev countable khoom (los yog chav kawm ntawm nws), los yog lub cev tsis suav cov khoom (los yog chav kawm ntawm no).
Dab tsi yog tus cim thiab qhov hloov pauv hauv Java?
tus cim tuaj yeem yog lub npe tshwj xeeb uas tuaj yeem siv los txheeb xyuas qhovvariable. Java Virtual Machine (JVM) siv lub npe ntawm qhov sib txawv los nrhiav qhov chaw nco ntawm qhov sib txawv thiab khaws cov nqi khaws cia hauv qhov chaw nco nrog qhov sib txawv. Cov npe sib txawv yog cov ntaub ntawv nkag siab hauv Java.
