Chapter 10 Exercises

Exercise 1. Get the current date

Solution:

import java.time.LocalDate;
public class Main {
    public static void main(String[] args) {
        
        LocalDate currentDate = LocalDate.now();
        System.out.println("The current date is: " + currentDate);
        
    }
}

Exercise 2. Get the current time

Solution:

import java.time.LocalTime;
public class Main {

    public static void main(String[] args) {
        LocalTime currentTime = LocalTime.now();
        System.out.println("The current time is: " + currentTime);

    }
}

Exercise 3. Get the current date and time

Solution:

import java.time.LocalDateTime;
public class Main {

    public static void main(String[] args) {
        LocalDateTime currentDateTime = LocalDateTime.now();
        System.out.println("The current date and time is: " + currentDateTime);

    }
}

Exercise 4. Create a specific date

Solution:

import java.time.LocalDate;
public class Main {

    public static void main(String[] args) {
        LocalDate date = LocalDate.of(2024, 5, 29);
        System.out.println("Specific date: " + date);

    }
}

Exercise 5. Create a specific time

Solution:

import java.time.LocalTime;
public class Main {

    public static void main(String[] args) {
        LocalTime time = LocalTime.of(14, 30, 45);
        System.out.println("Specific time: " + time);

    }
}

Exercise 6. Add days to a date

Solution:

import java.time.LocalDate;
public class Main {

    public static void main(String[] args) {
        LocalDate currentDate = LocalDate.now();
        LocalDate newDate = currentDate.plusDays(10);
        System.out.println("Current date: " + currentDate);
        System.out.println("Date after 10 days: " + newDate);

    }
}

Exercise 7. Subtract hours from a time

Solution:

import java.time.LocalTime;
public class Main {

    public static void main(String[] args) {
        LocalTime currentTime = LocalTime.now();
        LocalTime newTime = currentTime.minusHours(3);
        System.out.println("Current time: " + currentTime);
        System.out.println("Time after subtracting 3 hours: " + newTime);

    }
}

Exercise 8. Compare two dates

Solution:

import java.time.LocalDate;
public class Main {

    public static void main(String[] args) {

        LocalDate date1 = LocalDate.of(2024, 5, 29);
        LocalDate date2 = LocalDate.of(2023, 12, 25);

        if (date1.isAfter(date2)) {
            System.out.println(date1 + " is after " + date2);
        } else if (date1.isBefore(date2)) {
            System.out.println(date1 + " is before " + date2);
        } else {
            System.out.println(date1 + " is equal to " + date2);
        }
    }
}

Exercise 9. Format a date

Solution:

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {

        LocalDate date = LocalDate.now();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
        String formattedDate = date.format(formatter);
        System.out.println("Formatted date: " + formattedDate);
    }
}

Exercise 10. Get the difference between two dates

Solution:

import java.time.LocalDate;
import java.time.Period;

public class Main {

    public static void main(String[] args) {
        LocalDate startDate = LocalDate.of(2023, 5, 1);
        LocalDate endDate = LocalDate.of(2024, 5, 29);
        
        Period difference = Period.between(startDate, endDate);
        System.out.println("Difference between dates: " + 
            difference.getYears() + " years, " + 
            difference.getMonths() + " months, " + 
            difference.getDays() + " days.");

    }
}