Find Maximum and Minimum Date in Java

Here is an example of determining maximum and minimum between two dates and among more than two dates.

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Collections;

public class MaxMinDate {

    public static void main(String[] args) {

        // First let's create two date objects
        LocalDate date1 = LocalDate.of(2020, 3, 12);
        LocalDate date2 = LocalDate.of(2020, 7, 15);

        // To determine the maximum or minimum date we can use method isAfter or isBefore method
        if (date1.isAfter(date2)) {
            System.out.println("Maximum Date : " + date1);
            System.out.println("Minimum Date : " + date2);
        } else {
            System.out.println("Maximum Date : " + date2);
            System.out.println("Minimum Date : " + date1);
        }

        // Now let's see how we can find the maximum and minimum date among more than two dates.
        // Let's create more date objects
        LocalDate date3 = LocalDate.of(2020, 1, 13);
        LocalDate date4 = LocalDate.of(2020, 3, 20);
        LocalDate date5 = LocalDate.of(2020, 7, 5);

        // Add all the date objects in an array list so that we can use utility methods of Collections class
        ArrayList<LocalDate> dateList = new ArrayList<>();
        dateList.add(date1);
        dateList.add(date2);
        dateList.add(date3);
        dateList.add(date4);
        dateList.add(date5);

        LocalDate maxDate = Collections.max(dateList);
        LocalDate minDate = Collections.min(dateList);

        System.out.println("The maximum date is " + maxDate);
        System.out.println("The minimum date is " + minDate);
    }

}