How to Get the First and Last Day of a Week in a Month Using Java

Learn how to effectively determine the first and last days of a specific week in any given month and year using Java's LocalDate. This step-by-step guide includes clear code examples and explanations.
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How to Get the First and Last Day of a Week in a Month Using Java

In Java programming, handling dates can sometimes be a challenge. One common requirement developers encounter is needing to find the first and last days of a specific week in a given month and year. In this post, we'll delve into a straightforward solution to this problem by leveraging Java’s LocalDate class. Whether you're a beginner or an experienced coder, you'll find this guide helpful for your date manipulation needs.

The Problem

Suppose you are given:

A specific month

A specific year

A specific week of the month

Your goal is to find the first day and last day for that week. For instance:

Example

For July 2021:

Week 1: First day: 1, Last day: 3

Week 2: First day: 4, Last day: 10

Week 3: First day: 11, Last day: 17

Week 4: First day: 18, Last day: 24

Week 5: First day: 25, Last day: 31

The Solution

We can achieve this by creating a method that calculates the week calendar for the specified month and year. Below are the detailed steps and code to demonstrate this solution.

Step 1: Define the getWeekCalendar Method

We'll create the getWeekCalendar method, which will keep track of the weeks in a month. Here’s how it works:

It initializes an empty HashMap to store the weeks.

It loops through each day of the month and checks if it's a Saturday. If so, it saves the current week information.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Testing the Method

To test the functionality, refer to the following main method. This will invoke the getWeekCalendar method and print the results.

[[See Video to Reveal this Text or Code Snippet]]

Output

Running the above main method will yield the following output, confirming that the method correctly identifies the first and last days of each week in July 2021:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In conclusion, finding the first and last day of a week given the month, year, and week number is achievable with a few lines of code using Java's LocalDate functionality. This method streamlines date calculations, allowing developers to handle similar date-related tasks with ease. Now you can implement and modify this solution according to your requirements!

Feel free to reach out in the comments if you have any questions or if you'd like to see more examples of date manipulation in Java.