Why abstract methods have no body?

[Manish Pamnani]

In the attachement below it says:-

An abstract method has no body!

Why an abstract method has no body & why does it ends with a semicolon?

while a abstract class has an body and we use keyword extends ?

[Pete Letkeman]

You have to implement the body in a child class some where down the line if inheritance. Why world you include a body of you knew that 100% of the time the code would be overwritten?

[Al Hobbs]

That picture is so weird

[Ganesh Patekar]

Al Hobbs wrote:That picture is so weird

but It makes easier to keep in mind that abstract methods don't have body.

[Al Hobbs]

Ganesh Patekar wrote:but It makes easier to keep in mind

I personally don't like things like that.  It could potentially confuse you if you read too much into that analogy.  

[Adrian Grabowski]

Al Hobbs wrote:

Ganesh Patekar wrote:but It makes easier to keep in mind

I personally don't like things like that.  It could potentially confuse you if you read too much into that analogy.  

I don't like those Head First books, at first I was "wow, great - those pictures will help me to understand the topic" but after first chapter I had enough of them, as you said - they are confusing and distracting.

[Campbell Ritchie]

I do like the books, even though they are rather weighted towards cert exams, and now pretty old. But it is obvious that some styles, particularly one as striking as the Head First style, will be very unhelpful to some people.