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Difference between abstract class and Interfaces in Java
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Answer / surendrareddy
abstract clas have both abstract methods and Concrete methods.
but interface have only abstract methods,
And also abstract class have construtor,but interface
doesn't have.
| Is This Answer Correct ? | 48 Yes | 9 No |
Answer / guest
abstract classes can have other concrete methods but
inteface only abstract methods.
| Is This Answer Correct ? | 35 Yes | 4 No |
Answer / manish sharma
Abstract classes Interfaces
Abstract classes are used only when there is a “is-a” type
of relationship between the classes. Interfaces can be
implemented by classes that are not related to one another.
You cannot extend more than one abstract class. You can
implement more than one interface.
Abstract class can implemented some methods also.
Interfaces can not implement methods.
With abstract classes, you are grabbing away each class’s
individuality. With Interfaces, you are merely extending
each class’s functionality.
| Is This Answer Correct ? | 24 Yes | 4 No |
Answer / your friend
abstract classes can have any type of medthods but
interface allows only abtract methods.
Interface is like a class not a class .
| Is This Answer Correct ? | 19 Yes | 8 No |
Answer / venkateswarlu dhaninkula
Interfaces consists of pure abstract methods
but not abstract class
abstract class having both abstract methods and non
abstract methods
interfaces declare all variables are final and public
but not abstract class
abstract class has a default constructor
but not interface
| Is This Answer Correct ? | 8 Yes | 1 No |
Answer / megha mokawat
Abstract class can have non-final variable aslo
but in interface variable are final by- default
| Is This Answer Correct ? | 8 Yes | 2 No |
Answer / narasimha raju
An abstract classes can have concrete methods and declares
abstract method which method can implement in different
ways. whereas in interface all are abstract methods.
in abstract class we can declare any type of variable
but in interface all are final variables.
| Is This Answer Correct ? | 8 Yes | 5 No |
Answer / krishna
In Abstract class should implementation methods information
with complete i.e Programmer duty .
But in Interfaces we can give implementations to End-User .
| Is This Answer Correct ? | 0 Yes | 0 No |
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I'm trying to solve this. But I'm not figuring the right solution. Can some one help what the answer is for the question below? You can use as many variables as you need, there are no negative numbers, all numbers are integers. You do not know the size of the integers, they could be infinitely large, so you can't count on truncating at any point. There are NO comparisons allowed, no if statements or anything like that. There are only four operations you can do on a variable. 1) You can set a variable to 0. 2) You can set a variable = another variable. 3) You can increment a variable (only by 1), and it's a post increment. 4) You can loop. So, if you were to say loop(v1) and v1 = 10, your loop would execute 10 times, but the value in v1 wouldn't change so the first line in the loop can change value of v1 without changing the number of times you loop. You need to do 3 things. 1) Write a function that decrements by 1. 2) Write a function that subtracts one variable from another. 3) Write a function that divides one variable by another. 4) See if you can implement all 3 using at most 4 variables. Meaning, you're not making function calls now, you're making macros. And at most you can have 4 variables. The restriction really only applies to divide, the other 2 are easy to do with 4 vars or less. Division on the other hand is dependent on the other 2 functions, so, if subtract requires 3 variables, then divide only has 1 variable left unchanged after a call to subtract. Basically, just make your function calls to decrement and subtract so you pass your vars in by reference, and you can't declare any new variables in a function, what you pass in is all it gets.
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