How to sort list of objects? [duplicate]

Question

I have a list of objects, each object has a method that returns distance from player to said object like that

object.distance(player)

now i need to sort that list from loqwest distance to furthest

What have you tried? What specifically do you need help with? — Carcigenicate
– Carcigenicate, Commented Nov 17, 2018 at 17:48
I tried iterating through the list and storing to an array distance for each object with key then sorting and returning the first, but is there better way of doing this? — Jirka Kastan
– Jirka Kastan, Commented Nov 17, 2018 at 17:52
I think a bit more code would be helpful here. In essence, you sort using a comparator, but if there is a List of some object, I'm not sure where the player is coming from. — KevinO
– KevinO, Commented Nov 17, 2018 at 17:54

Amit Kumar Lal · Accepted Answer · 2018-11-17 17:59:26Z

0

You can use interface java.lang.Comparable in java

Example (pseudo code) assuming object.distance(player) returns an Integer value

class Distance implements Comparable<Distance>{
  /**
    * Compare a given Distance with this object.
    */
    public int compareTo(Distance o) {
        return this.distance(player).compareTo(o.distance(o.player));
    }
}

now you can sort your list like

Collections.sort(YourListOfDistance)

here some reference

When should a class be Comparable and/or Comparator?

answered Nov 17, 2018 at 17:59

Amit Kumar Lal

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