Difference between abstract class and interface in java

Let’s learn difference between abstract class and interface in java.

Here’s the difference between abstract class and interface.

Abstract class	Interface
If we know method implementation, but partial implementation then use abstract class.	If we know do not know method implementation then use interface.
Each method in abstract class need not be public and abstract.	In interface each and every method is always public and abstract by default. Hence 100% abstract class.
Abstract class do not support multiple inheritance.	Interface support multiple inheritance in java.
There are no restrictions on abstract class access modifiers.	cannot declare interface methods with private, protected access modifiers.
Variables in abstract class need not be public, static and final.	every variable in interface is public static and final by default.
There is no restriction abstract class variables modifiers.	cannot declare interface variables with private, protected, transient, volatile access modifiers.
Not required to initialize at the time of declaration.	interface variables should be initialized at the time of declaration. Else we get compile time error.
we can declare static and instance block.	we cannot declare instance and static blocks.
we can declare constructors.	we cannot declare constructors.