When we r go to abstract class and when we go to Interface? i have confusion

When we r go to abstract class and when we go to Interface?
i have confusion this question while in interview plz clarify

Question Posted / suresh royal

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When we r go to abstract class and when we go to Interface? i have confusion this question while ..

Answer / atul

multiple inheritence is not possible so we use interface
instead of it.when we declare interface then inside declare
all methods is by default abstract, data member is by
default final & static .final means there is must
Initialization at declare time otherwise inside first
constructor call.
thats it...

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When we r go to abstract class and when we go to Interface? i have confusion this question while ..

Answer / nani

If we want share some common features with all we can go for
abstract otherwise we can prefer interface .
i will give good example to understand easily.
Ex: wholesaler has books and stationary(pens & papers)

supplier1 ask for X class books and Pens
Supplier2 ask for X class books and papers.

here both suppliers asking same standard books and different
stationary items.suppose we can take it as by methods, here
here books methods are common to shared by both suppliers.so
book method is non abstract class. so here we can prefer
abstract.

supplier1 ask for X class books and Pens
Supplier2 ask for V class books and papers.

here both suppliers asking different standard books and
different stationary items.

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5 Yes

0 No

When we r go to abstract class and when we go to Interface? i have confusion this question while ..

Answer / arjun

In interface we can writer interface keyword and abstract we can write abstract class
In interface we can write constructor but abstract no
In interface we can forcely implement all methods but abstract no
In interface all variables public static final we can not change but abstract not

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