I understand that neither a abstract class nor an interface can contain a method that is both abstract and static because of ambiguity problems, but is there a workaround?
I want ... |
Alright so I've looked for documentation by googleing, however I haven't found any that really describes what I'm looking to answer, so here I am asking you guys.
So I get ... |
Something I've seen a lot but never thought to question it... In a Java Interface, what is the difference between:
public void myMethod();
and
public abstract void myMethod();
I understand the purpose of the abstract ... |
I have a abstract class called Customer which has some attributes shared amongst all customers(ex id, name, surname).
Then I have few classes such as PriorityCustomers which have special unique fields such ... |
I want to define an abstract method like so:
public abstract class Saveable {
public Set<Field> getFieldSet();
...
}
getFields() should always return the same output regardless of ... |
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class abstract ListForm extends JFrame{ public ListForm(String title){ super(title); } //some abstract motheds } class MyList extends ListForm{ public MyList(String title){ super(title); } //implements these abstract methods here } [error] and when compile, MyList class has the error massage like this : MyList.java [18:1] cannot resolve symbol symbol : constructor MyList () location: class ListForm public class MyList extends ListForm { ... |
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I have been chewing of this question for a couple of days. I have class A I have class B which extends class A I have class C which extends class B I have one method which sets a value - this is used by class B and class C (NOT class A); therefore class C will inherit it if it ... |
hi i have one doubt. abstaract class menas it having abstaract methods interface menas abstaract methtods and constant variable. we are writing class abstract inthis class we write all methods abstract and declare variales final it act as a interface or not .we can write means wt is the diff between abstract and interface |
With abstract classes, you can choose to implement some of the functionality, while leaving other functionality abstract. This way code that should be shared by many implementations can already be provided. The Collections framework uses both: interfaces for defining the functionality, and abstract classes implementing those to provide basic functionality. For instance, when you want to write a new Collection implementation, ... |
Thanks for the help guys. What caused the confusion was the careless naming of my class 'Character'. So, two things to note from all of this: 1. Subclasses do **not** inherit their corresponding superclass' import statements. If you want to use something outside of the local package, you must import it -- no exceptions. 2. Be careful not to name classes ... |
Dear david We have a class , and other class can inherited from that. We have an abstract class. and other class can inherited from that. The only difference is that we can not create an object of an abstract class. Now, What is the advantage?If it is about inheritance, Then we can use inheritance as it .When to use abstract? ... |
Since it is public, you do not *need* an accessor. Some notes on best practices: It is unusual for this to be a static field. (And I don't think you intend for it to be shared across all instances.) If it is static, you can AbstractItem.number and don't even need an item. It would be better to make it private and ... |
Below are the Instruction of my Problem, the Coding what I get so far and my Question about my problem . Part A) Instruction - Write a PersonAbstract class that has one abstract method: ToString - Write a Person class that contain the following info. and inherit the PersonAbstract class. Attribues Name & Java Type m_Age (stores the age) & Java ... |
Hi all, first post. I'm currently working on a simple flashcard app to teach myself a bit about Java and it's generally going well, but I've hit a problem. Basically, my code is structured like this: I have an abstract FlashCard class, and then I have a number of classes inheriting from this class which represent specific types of flashcard, like: ... |
You have defined field2 as a Collection, so that is what you get - even though you may have instantiated it as an ArrayList, defining the variable as a Collection will limit you to the methods Collection has to offer. You can redefine it as a List, cast to a List, or any number of other techniques to get your desired ... |
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See I told you.. the OP knows what it is.. Just testing your skills.. Now you people can go ahead and answer where in the world you use them.. Like say how do you refer the protected class brain() when such dumb questions are asked.. Or say someone overrides the method georgemc() in abstract class DumbQuestions() and gives replies.. |
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I don't know. I didn't read your assignment that closely, so I'm not sure what your class hierarchy is supposed to look like. My code was just to give you an idea of how delegation works and what you might want to do with your constructors. Even if I did know exactly what you're supposed to do, I probably wouldn't tell ... |
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I'm trying to do some simple inheritance but I'm a little stuck. Without giving too much away here's what I have (or am trying to have). I have an abstract "Test" class and a number of concrete classes that extend that abstract class. In my main method I have an array of Test objects. Each object in the array is a ... |