Sorting based on multiple condition and using other list in java

Question

I have

class cluster{
    string name;
    string id;
    list<Feature> flist;
}

class Feature{
    string name;
    string id;
}

cluster can have multiple lists of Feature

Now I have list of Feature say list<Feature> list={f1,f2,f3,f4} , thease Feature objects can be spread across different cluster objects and some might be not part of any cluster.

I have list of cluster and I have to sort based on the list of Feature I have.

input:
cluster1-f2,f6,f7
cluster2-f3,f4,f5
cluster3-f9,f8
cluster4-f1,f10
cluster5-f11,f12



 output:
 cluster4-f1,f10
 cluster1-f2,f6,f7
 cluster2-f3,f4,f5
 cluster3-f9,f8
 cluster5-f11,f12

Please help me to sort cluster objects based on the given Feature list.

This isn't a coding-writing service, what have you tried?

Benjamin Lowry
– Benjamin Lowry

2016-02-10 04:17:58 +00:00
Commented Feb 10, 2016 at 4:17 — Benjamin Lowry
– Benjamin Lowry, Commented Feb 10, 2016 at 4:17

Ernie Thomason · Accepted Answer · 2016-02-10 04:33:11Z

1

I'm not a Java expert, but below is how I sort custom object arrays. In my example, I have an array of Card objects and can call sortByInterval to sort the array (without returning a new array). In the Comparator class you return either -1, 1 or 0 so you can add whatever code you need to compare.

public static void sortByInterval (ArrayList<Card> array) {
    Collections.sort(array, new SortByIntervalComparator());
}

private static class SortByIntervalComparator implements Comparator<Card> {
    public int compare(Card card1, Card card2) {

        if (...) return -1      // -1: obj1 first
        else if (...) return 1; // 1: obj2 first
        else return 0;      // equal sort
    }
}

answered Feb 10, 2016 at 4:33

Ernie Thomason

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1 Comment

Martin Frank Over a year ago

using comperator is the proper way to set the order!

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