How to sort an attribute of an object using Collections

Question

Good day!

I have an object student with the following attributes:

class Student
    String name
    Date birthday

I used arrayList

Answer 1

Hi this is a sample that can help you to understand

package de.vogella.algorithms.sort.standardjava;

import java.util.Comparator;

public class MyIntComparable implements Comparator{

    @Override
    public int compare(Integer o1, Integer o2) {
        return (o1>o2 ? -1 : (o1==o2 ? 0 : 1));
    }
}


package de.vogella.algorithms.sort.standardjava;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Simple2 {
    public static void main(String[] args) {
        List list = new ArrayList();
        list.add(5);
        list.add(4);
        list.add(3);
        list.add(7);
        list.add(2);
        list.add(1);
        Collections.sort(list, new MyIntComparable());
        for (Integer integer : list) {
            System.out.println(integer);
        }
    }
}