I am calling a specific class using only its interface. The problem is, the class itself implements Comparable, but because I am referring to the class via a different interface, the compiler does not
What is开发者_如何学Go the difference between returning 0, returning 1 and returning -1 in compareTo() in Java?Official Definition
I am able to compare Strings fine, but would like to know how I can rank floating point numbers? getChange() returns a String. I want to be able to sort descending. How can I do this?
I\'m making a TreeSet of Point2D.Float type, creating it with a custom Comparable class that implements compare() of Point2D type. However, on calling \"contains\" on the TreeSet, I get a classcast er
I need an example on how to use a comparable class on a 开发者_StackOverflowHashSet to get an ascending order. Let’s say I have a HashSet like this one:
In Java, how would I use generics to create a max function that takes as parameters two Comparable objects of the same type and returns the larger one?
I need a comparator as part of a strategy pattern that can either use the natural ordering of the objects or some custom ordering. For the natural ordering case, I wrote a simple comparator:
As far as I know, things such as SortedMap or SortedSet, use compareTo (rather than equals) on Comparable<?> types for checking equality (contains, containsKey).
If an object holds a unique primary key, what interfaces does it need to implement in order to be collection friendly especially in terms of being efficiently sortable, hashable, etc...?
I have a method which needs a Comparator for one of its parameters. I would like to pass a Comparator which does a normal comparison and a reverse comparator which does in reverse.
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