abstract

[maheshpwr]

What is difference between abstract class and interface ???
and when the used ???

[vitthal]

Abstract class can contain abstract methods, abstract property as well as other members (just like normal class).

Interface can only contain abstract methods, properties but we don’t need to put abstract and public keyword. All the methods and properties defined in Interface are by default public and abstract.

//Abstarct Class
public abstract class Vehicles
{
private int noOfWheel;
private string color;
public abstract string Engine
{
get;
set;
}
public abstract void Accelerator();
}
//Interface
public interface Vehicles
{
string Engine
{
get;
set;
}
void Accelerator();
}

[Tolls]

Abstract class can contain abstract methods, abstract property as well as other members (just like normal class).

What's an abstract property?
Or do you mean simply abstract getters and setters (which would be abstract methods anyway)?

Oh, and if you're going to give sample code at least make sure it's vaguely correct.

[vitthal]

What's an abstract property?
Or do you mean simply abstract getters and setters (which would be abstract methods anyway)?

Oh, and if you're going to give sample code at least make sure it's vaguely correct.

I am not that much senior to answer you but if you are asking then I will try,
An abstract method/property is a method that is declared without an implementation.
When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.

Can you explain what is wrong in that code?

[Tolls]

Yes, but the term "abstract property"?
That makes no sense to me.
Surely that's just an abstract method? Since you can't have abstract attributes...

As for the code:

public abstract [B]string [/B]Engine
{
[B]    get;
    set;
[/B]}

public interface Vehicles
{
[B]    string Engine
    {
        get;
        set;
    }[/B]
    void Accelerator();
}

The bits in bold are all wrong.

[j2me64]

What is difference between abstract class and interface ???
and when the used ???

an other difference is when a class want to use an interface the class must be declared with the keyword implements and when the class want to use an abstract class the class must be declared with the keyword extends. in both cases the class must implement all abstract methods.

@vitthal: Real-world objects contain state and behavior, java objects contain fields and methods.

[Tolls]

an other difference is when a class want to use an interface the class must be declared with the keyword implements and when the class want to use an abstract class the class must be declared with the keyword extends. in both cases the class must implement all abstract methods.

Unless the class itself is declared abstract.
:)