All Questions
10 questions
9
votes
4
answers
3k
views
OOP Design considering no modifications to existing design
The question is:
interface Animal {
void eat();
}
class Lion implements Animal{
public void eat(){
//do somethng
}
}
class Test {
public static void main(String[] args) {
...
- 109
4
votes
2
answers
111
views
How are settings structured when they can be configured in diffferent ways?
Suppose of this question the following:
I'm in full control of this project
I'm writing a media player
Obviously, a media player will allow a user to adjust the volume, so I might have a class that ...
user325735
0
votes
3
answers
368
views
Send records using async or sync way
I have bunch of keys and values that I want to send to our messaging queue by packing them in one byte array. I will make one byte array of all the keys and values which should always be less than 50K ...
- 61
-1
votes
3
answers
2k
views
Can I say Interface is a set of general behavior? [duplicate]
I'm new to OOP. Can I say Interface is a set of general behavior that may be have and act uniquely by a set of objects that have in common? And Abstract class has similarity with Interface but it have ...
- 11
1
vote
1
answer
349
views
How to design the system which executes two process independently with different configuration?
I have two process ProcessA and ProcessB. I want to run these two process independent of each other. There is no relation between them at all.
Each process should have a different Properties object.
...
- 123
1
vote
3
answers
4k
views
Why List<E> interface is additionally introduced in collection hierarchy? [duplicate]
Below is the diagram, where, if we just consider the implementations of List,
AbstractList maintains the core behavior of list. To introduce the new implementation class MyList(say) one can inherit ...
- 2,305
2
votes
5
answers
6k
views
Should abstract classes be used to prevent instantiation
Is preventing the instantiation of a class a valid reason to make it abstract? For example, if I have a class called Gauge which has subclasses HeadingIndicator and AirSpeedIndicator, is it a good ...
- 183
1
vote
3
answers
44k
views
I want to understand clearly why can't we instantiate an object of an abstract class [duplicate]
Can I get a clear explanation why why can't we instantiate an object of an abstract class. I know abstract is not real. But I want to know more why can't we instantiate an object of an abstract class.
- 121
5
votes
6
answers
9k
views
What are abstract classes and abstract methods?
I got several explanations but so far I'm not able to understand that what are the abstract classes and methods in Java.
Some said it has to do something with the security of the program, other said ...
- 163
43
votes
9
answers
117k
views
Why should I declare a class as an abstract class?
I know the syntax, rules applied to abstract class and I want know usage of an abstract class
Abstract class can not be instantiated directly but can be extended by other class
What is the ...
- 535