Mastering Java LocalDate Range Method

Introduction

In this lab, you will learn about the range() method of the Java LocalDate class. This method is used to get the range of valid values for a specified date field, such as the day-of-month, day-of-week, or year. You will learn how to use ChronoField enum as an argument to get a range of the specified field.

Skills Graph

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Import necessary classes

To use the LocalDate class and ChronoField enum, you need to import them at the beginning of your code file.

import java.time.LocalDate;
import java.time.temporal.ChronoField;
import java.time.temporal.ValueRange;

Create a `LocalDate` object

We will create a LocalDate object for any date, such as 2022-01-01.

LocalDate date = LocalDate.of(2022, 01, 01);

Get the range of the day-of-month field

Now, we will get the range of the day-of-month field using the range() method and the ChronoField.DAY_OF_MONTH constant.

ValueRange range = date.range(ChronoField.DAY_OF_MONTH);

Print the range of valid values

We will print the range of valid values for the day-of-month field using the getValue() method of ValueRange.

System.out.println("Range of valid values for day-of-month: " + range);

Get the range of the month field

Now, we will get the range of the month field using the range() method and the ChronoField.MONTH_OF_YEAR constant.

ValueRange range2 = date.range(ChronoField.MONTH_OF_YEAR);

Print the range of valid values

We will print the range of valid values for the month field using the getValue() method of ValueRange.

System.out.println("Range of valid values for month: " + range2);

Get the range of the year field

Now, we will get the range of the year field using the range() method and the ChronoField.YEAR constant.

ValueRange range3 = date.range(ChronoField.YEAR);

Print the range of valid values

We will print the range of valid values for the year field using the getValue() method of ValueRange.

System.out.println("Range of valid values for year: " + range3);

Compile and run the program

To compile and run the program, type the following commands in the terminal:

javac LocalDateRange.java
java LocalDateRange

If everything is correct, you will see the range of valid values for the day-of-month, month, and year fields.

Summary

Congratulations! You have learned how to use the range() method of the Java LocalDate class to get the range of valid values for a specified date field. You learned how to use the ChronoField enum as an argument to get the range of the specified field.