LocalDate compareTo() method in Java

The compareTo() method of LocalDate class in Java method compares this date to another date.

Syntax:

public int compareTo(ChronoLocalDate other)

Parameter: This method accepts a parameter other which specifies the other date to compare to and it is not specifically null.

Return Value: It returns the comparator value which is negative if it is less else it is positive if it is greater.

Below programs illustrate the compareTo() method of LocalDate in Java:

Program 1:

// Program to illustrate the compareTo() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        // First date
        LocalDate dt = LocalDate.parse("2018-11-01");
        System.out.println(dt);

        // Second date
        LocalDate dt1 = LocalDate.parse("2018-11-14");
        System.out.println(dt1);

        // Compare both dates
        System.out.println(dt1.compareTo(dt));
    }
}

Output:

2018-11-01
2018-11-14
13

Program 2:

// Program to illustrate the compareTo() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        // First date
        LocalDate dt = LocalDate.parse("2018-11-21");
        System.out.println(dt);

        // Second date
        LocalDate dt1 = LocalDate.parse("2018-11-14");
        System.out.println(dt1);

        // Compare both dates
        System.out.println(dt1.compareTo(dt));
    }
}

Output:

2018-11-21
2018-11-14
-7

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDate.html#compareTo(java.time.chrono.ChronoLocalDate)