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I have a list of objects I need to sort on a field, say Score. Without giving much thought I wrote a new class that implements Comparator, that does the task and it works.
Now looking back at this, I am wondering if I should have instead have the my class...
Started by pkrish on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Based on an internal ID
Implement a Comparator if you have a more....
Is-the-difference-between-implementing-comparable-and-comparator
I would say the following: Implement Comparable for something like a natural ordering, e.g.
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I'm really trying to like generics, but so far the trouble they've caused outweighs any benefits. Please, please show me I'm wrong.
I understand the necessity of adding @SuppressWarnings("unchecked") when using generic-free frameworks (Spring, Hibernate...
Started by Monkey Boson on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
comparable, in which case you just compare them directly, or you create a comparator -
public class Bean instanceof Comparable) { @SuppressWarnings("unchecked") Comparable<Object> originalValue implements Comparable....
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In which situations we have to implement the Comparable interface?
Started by Johanna on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
When your class implement the Comparable interface, you.
I don't know what else there is to add.
If you add them to a sorted list.
Implementing Comparable gives your objects a compareTo method.
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Ask your Facebook Friends
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Is there anything comparable to Visual Basic to use in Ubuntu?
Answer Snippets (Read the full thread at stackoverflow):
Also, perhaps KBasic ....
You can learn to use Python and see almost immediate gains in productivity and lower maintenance costs .
Python perhaps?
Python is a programming language that lets you work more quickly and integrate your systems more effectively .
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I see code like this
class A implements Comparable<A> { }
What does this mean, what are the advantages and disadvantages of it?
Answer Snippets (Read the full thread at stackoverflow):
The Comparable puts the sorting logic directly in the class be sorted using the Comparable....
Implementing the Comparable interface means that the class supports responsible for sorting other classes.
Sorting functionality for lists).
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I was wondering why the sort method of the Arrays class is asking for a parameter of type Object[]. Why the parameter is not of type Comparable[]. If you don't pass a Comparable[] it's generating a ClassCastException.
Why ... public static void sort(Object...
Started by Joel on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
You can do:
Object.
It to Comparable[] if the original type was Object[], since the array type does not match.
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Hi all,
I want to have an interface A parameterised by T A<T> , and also want every class that implements it to also implement Comparable (with T and its subtypes). It would seem natural to write interface A<T> extends Comparable<? extends...
Started by oceola on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
If you use comparable you do not need.
When Comparable<? extends T> appears it means you have an instance of Comparable that can instances of T in order to implement your compareTo method.
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In Java 1.4.2, class java.math.BigInteger implements interfaces Comparable, Serializable.
In Java 1.5.0, class java.math.BigInteger implements interfaces Serializable, Comparable<BigInteger>.
This is just an example to help me ask about < and...
Started by eleven81 on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
For a little more clarification in this case, have a look at the Javadocs for Comparable....
Is a type parameter - Comparable is a generic class, and in this case the angle brackets mean that the class is comparable to other BigIntegers.
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I'm having problems trying to pass an Integer object from a driver class as an argument for function of a SortedArray Generic class I created. From my driver class, I convert the user's int input into an Integer object to be cast onto Comparable of my...
Answer Snippets (Read the full thread at stackoverflow):
However, 1.5 ....
Comparable is a 1.4.2 interface, while telling you is incorrect.
CompareTo(Integer i)
Objects which implement (and therefore can be casted to) Comparable must have take any object, it cannot be cast as a Comparable.
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I profiled my code and found out that my class, which implements Comparable<T> , spends 8x more cpu time in
compareTo(Object)
than in
compareTo(T)
I assume that the slowdown is because of virtual table lookup for this method.
Is there a way to force...
Started by Dani on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
It just means....
The reason you are seeing compareTo(Object) is because of Type Erasure .
Probably, there is something else which is causing the problem .
Since java does not preserve generic types at runtime, ideally both of them should behave the same .
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