Menene bambanci tsakanin mambobi na static da mambobi na instance?

Question

Accepted Answer

**Mambobi na instance** na gida ga kowane abin da kuma iya bambanta ta kowane abu. **Mambobi na static (ajin)** na gida ga *ajin kanta* — akwai daidai cikakken nushe ɗaya, wanda gwamnatin sauran abubuwa, kuma kayi amfani da shi ba tare da sarrafa abu ba.

## Cikakken nushe ɗaya da jiya ga kowane abu

```java
public class Counter {
    static int total = 0;        // ONE shared across all instances
    int id;                      // ONE per object

Counter() {
        total++;                 // increments the shared counter
        id = total;              // unique per object
    }

static int getTotal() { return total; }   // no object needed
}

new Counter(); new Counter();
System.out.println(Counter.getTotal());  // 2 — accessed via the class
```

`total` ana raba; `id` ga kowane abu. `getTotal()` ana kiranta akan ajin, ba samhala ba.

## Babbar dokoki

```text
static method   → cannot use 'this' or instance fields (no object exists)
instance method → can use both static and instance members
static field    → shared mutable state → beware in concurrent code
```

## Karki

Haɗiya na static mai haɗi abubuwa amma **tiyata ne sukar** kuma suna ƙirƙira nincin gaba daya - yin amfani sosai da su yana kara zuwa ga jajirren code kuma yana damun gwaji. Filayen static da sauƙin juyewa sune tushen kofa na thread-safety kuɗi.

## Me yasa yana da mahimmanci

Zabin static da samhala shine sashen zane-zane: static ya dace da wasittar ba tare da yawon koli ba da gaggawa da kwan-gaggawa na ajin, samhala ta gabatarwa ga kome da alaƙa da nuwun abin.

Karki gida shine nincin jiyya da sauƙi - gida nincin jiyya ne, wanda ke makaryata koda kuma yana ƙera a ƙarƙashiŋ isokarewa da gwaji.