Answer Posted / cinda

1)abstact class may or may not include abstract methods(An
abstract method is a method that is declared without an
implementation )
Bt interface is a class with only signature of a
methods.class that implements an interface must implement
all of the interface's methods.

example for abstract class:-
public abstract class x {
int x,y;//definitions
void draw(){}//non abstract methods
abstract void YY();//abstract methods
}

example for interface:-
interface x
{
void sample(int y);//signature of amethod
}

2)abstract class can inherit from only one class(it doesnt
support multiple inheritance)

public abstract class x {
int x,y;//definitions
void draw(){}//non abstract methods
abstract void YY();//abstract methods
}
class y extends x{
void draw(){
....
}
but interface supports multiple inheritance

Interface interface1{
.....
}

Interface interface2{
.....
}

Interface interface3{
.....
}
public Interface x extends interface1,interface2,interface3{

}

In Interfaces , it was noted that a class that implements
an interface must implement all of the interface's methods.
It is possible, however, to define a class that does not
implement all of the interface methods, provided that the
class is declared to be abstract. For example,
abstract class X implements Y {
// implements all but one method of Y
}

class XX extends X {
// implements the remaining method in Y
}

In this case, class X must be abstract because it does not
fully implement Y, but class XX does, in fact, implement Y.

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