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Java Class Q&A » extend Class » super 

1. Java extends beginner question    stackoverflow.com

i have a java beginner question: Parent.print() prints "hallo" in the console, but also Child.print() prints "hallo". I thought it has to print "child". How can i solve this?

public class Parent {

  private String ...

2. What is the difference between creating instance by extending superclass and by extending its own class?    stackoverflow.com

For example:

List<String> list = new ArrayList<String>();
vs
ArrayList<String> list = new ArrayList<String>();
What is the exact difference between these two? When should we use the first one and when should we use the second? ...

3. Extending a class in java but it wont inherit properties from the superclass    stackoverflow.com

ok so on my program i have some labels (which are in an array and stuff) anyway i want to add my own property to the inbuilt Label class, anyway so ...

4. Using super method while extending a class    coderanch.com

I want to get myself a clear understanding of how we use super method I have one class call AdvSearchEx i have one method in AdvsearchEx as public void onClickSearch(Button button, ArgumentList args) Now i havw extended the class as following -------------------------------------------------------------------------- public class AdvSearchEx extends com.documentum.webcomponent.library.advsearch.AdvSearchEx { public void onClickSearch(Button button, ArgumentList args) { super.onClickSearch(button,args); System.out.println("Reached Custom class!!"); } -------------------------------------------------------------------------- ...

5. Extends Superclass    coderanch.com

6. Java extends Object,SuperClass?    coderanch.com

Yep the compiler will just replace it with class A or whatever the compiler wants to do - I would not really bother with how it does it. What it does is important, Rancher class now extends A. Since in java a class can only extend one class at a time (multiple inheritance is not allowed) Rancher no longer (directly) extends ...

7. new Class { Subclass1.class, Subclass2.class}; ??    coderanch.com

Ok, my problem is creating an array of Classes, such that the classes are all subclasses of a specific super class. This should be possible, I believe, since the objects being instantiated are of type "Class", and not instances of the named classes. Doesn't the compiler have enough information to create this, and enforce it? Furthermore, couldn't SuperClass also be abstract, ...

8. Extending a superclass    forums.oracle.com

I have a class A. I would now like to make another class B that extends A. The only difference between A and B is that B should implement an interface that A does not implement. I don't want the superclass A to implement this interface it should only be implemented by the child B. But it seems rather silly to ...

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