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Multidimensional arrays in Java extends which class?


Multidimensional arrays in Java extends which class?

By : user3848508
Date : October 25 2020, 12:12 PM
Hope that helps A multidimensional array in Java is really just an array of arrays (of arrays)* .
Also, arrays are considered subclasses of Object.
code :


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Java Collection compare generic class that extends interface that extends comparable

Java Collection compare generic class that extends interface that extends comparable


By : nickbeibei
Date : March 29 2020, 07:55 AM
Does that help The problem is that Collections.max(Collection) wants the T's to be comparable to themselves not some other type.
In your case IntegerDataPoint is comparable to Integer, but not IntegerDataPoint
Java Generics compile error in line class HanoiStack<T extends Comparable<T>> extends Stack<T>

Java Generics compile error in line class HanoiStack<T extends Comparable<T>> extends Stack<T>


By : Jerry He
Date : March 29 2020, 07:55 AM
Hope that helps I come from C#, and I have no idea why Stack part of the line below is a compile error. Can anyone help , Class declarations can't throw exceptions. Perhaps you meant
code :
public class HanoiStack<T extends Comparable<T>> extends Stack<T> {

    public HanoiStack() throws IllegalArgumentException {
       ...  
    }
}
Android- Difference between Java class extends AppcompatActivity & extends Activity & extends ActionBar?

Android- Difference between Java class extends AppcompatActivity & extends Activity & extends ActionBar?


By : Nidhi Jain
Date : March 29 2020, 07:55 AM
around this issue extending ActionBarActivity gives you the ActionBars functionality on every API level >= 7 by extending Activity you can avoid adding additional projects/libraries to your project but you'll lack the ActionBar on api levels below 11
ActionBarActivity is part of the Support Library. Support libraries are used to deliver newer features on older platforms. For example the ActionBar was introduced in API 11 and is part of the Activity by default (depending on the theme actually). In contrast there is no ActionBar on the older platforms. So the support library adds a child class of Activity (ActionBarActivity) that provides the ActionBar's functionality and UI
Advantage of generic wildcard in java.util.Arrays.copyOf(U[], int, Class<? extends T[]>)

Advantage of generic wildcard in java.util.Arrays.copyOf(U[], int, Class<? extends T[]>)


By : Rabiul Islam
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Say you have a Dog[] and an Animal[], and you want to copy your Dog[] into a Animal[]:
code :
Dog[] dogArray = whatever;
Animal[] animalArray = whatever;
Animal[] copy = Arrays.copyOf(dogArray, dogArray.length, animalArray.getClass());
Animal[] copy = Arrays.copyOf(dogArray, dogArray.length, animalArray.getClass());
How to Merge two or more multidimensional arrays into single multidimensional array using Java

How to Merge two or more multidimensional arrays into single multidimensional array using Java


By : mpech
Date : October 10 2020, 04:00 PM
I wish this help you Stream the arrays, collect the stream to a List and then convert to an array. Something like,
code :
Object[][][] total = Stream.of(obj1, obj2, obj3, obj4)
        .collect(Collectors.toList()).toArray(new Object[0][0][0]);
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