Cov txheej txheem:
Video: Dab tsi yog qhov tseem ceeb ntawm cov ntaub ntawv keeb kwm yav dhau los hom int thiab ntab?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Default Values of Java's Primitive Types
| Hom | Default tus nqi |
|---|---|
| int | 0 |
| ntev | 0 |
| ntab | 0,0f ua |
| ob npaug | 0.0d ib |
Ib yam li ntawd, nws tau nug, dab tsi yog tus nqi pib ntawm INT?
int : Los ntawm ua ntej , cov int hom ntaub ntawv yog ib tug 32-ntsis kos npe ob lub complement integer, uas muaj qhov tsawg kawg nkaus tus nqi ntawm -231 thiab qhov siab tshaj plaws tus nqi ntawm 231-1.
Tsis tas li ntawd, hom twg tseem ceeb tuaj yeem tuav tus nqi loj tshaj plaws? Nyob rau hauv IEEE 754 floating-point tus lej tus qauv rau 32 ntsis lus, lub loj tshaj plaws tus lej zoo li ntawd ua tau 1.111111111111111111111111 x 2127 3.40282347 x 1038.
Tus lej.
| Hom | Loj | Ntau yam |
|---|---|---|
| byte | 8bit ib | -128.. 127 |
| luv | 16 bits | -32, 768.. 32, 767 |
| int | 32bit ib | -2, 147, 483, 648.. 2, 147, 483, 647 |
Tsuas yog li ntawd, dab tsi yog qhov tseem ceeb ntawm ntau hom primitive?
Default Value of Data Types in Java:
| Hom ntaub ntawv | Default Value (rau cov teb) |
|---|---|
| ntev | 0 l xav |
| ntab | 0,0f ua |
| ob npaug | 0.0d ib |
| char | 'u0000' |
Dab tsi yog cov ntaub ntawv tseem ceeb thiab tsis yog cov ntaub ntawv qub?
Primitive Versus Non-Primitive
- Cov ntaub ntawv keeb kwm muaj xws li byte, int, ntev, luv, ntab, ob npaug, thiab char.
- Non-primitive, los yog siv cov ntaub ntawv hom, yog cov tswv cuab ntau dua ntawm cov ntaub ntawv hom tsev neeg.
- Cov ntaub ntawv siv tau tuaj yeem yog chav kawm, interface, lossis array sib txawv.
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