Sort ArrayList of custom Objects by property in java

 Sort ArrayList of custom Objects by property in java

Do Check My Utility Class Video:

Example:

import java.util.Collections;

import java.util.Comparator;

import java.util.ArrayList;

//Customized Sorting

public class Test{

    public static void main(String[] args) {

        ArrayList<String> l = new ArrayList<>();

        l.add("z");

        l.add("a");

        l.add("k");

        l.add("n");

        // l.add(new Integer(10));//CCE

        //l.add(null);//NPE

        System.out.println("Before Sorting: "+l);//[z, a, k, n]

        Collections.sort(l,new MyComparator());

        System.out.println("After Sorting: "+l);//[z, n, k, a]

    }

}

class MyComparator implements Comparator{

    public int compare(Object obj1,Object obj2){

        String s1 = (String)obj1;

        String s2 = obj2.toString();

        return s2.compareTo(s1);

    }

}

o/p:

Before Sorting: [z, a, k, n]

After Sorting: [z, n, k, a]