Java LocalTime plusHours()

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In this guide, you will learn about the LocalTime plusHours() method in Java programming and how to use it with an example.

1. LocalTime plusHours() Method Overview

Definition:

The plusHours() method of the LocalTime class in Java is utilized to add the specified number of hours to the current LocalTime instance, returning a new LocalTime object representing the result.

Syntax:

public LocalTime plusHours(long hoursToAdd)

Parameters:

- hoursToAdd: the hours to add, may be negative.

Key Points:

- The plusHours() method returns a new LocalTime instance with the specified hours added to the original time.

- The original LocalTime object remains unmodified, as LocalTime instances are immutable.

- If the addition results in a time beyond 24 hours, the hour value wraps around.

- The method does not affect the minute, second, or nanosecond values of the LocalTime.

- If hoursToAdd is negative, the method effectively subtracts the absolute value of the hours from the current time.

2. LocalTime plusHours() Method Example

import java.time.LocalTime;

public class LocalTimePlusHoursExample {
    public static void main(String[] args) {
        // Get the current LocalTime
        LocalTime currentTime = LocalTime.now();
        System.out.println("Current Local Time: " + currentTime);

        // Add 5 hours to the current LocalTime
        LocalTime timeAfterAddingHours = currentTime.plusHours(5);
        System.out.println("Local Time After Adding 5 Hours: " + timeAfterAddingHours);

        // Subtract 3 hours from the current LocalTime using negative parameter
        LocalTime timeAfterSubtractingHours = currentTime.plusHours(-3);
        System.out.println("Local Time After Subtracting 3 Hours: " + timeAfterSubtractingHours);
    }
}

Output:

Current Local Time: 10:15:30.123456789 (example time, actual output will vary)
Local Time After Adding 5 Hours: 15:15:30.123456789
Local Time After Subtracting 3 Hours: 07:15:30.123456789

Explanation:

In this example, we first retrieve the current LocalTime and print it to the console. 

We then use the plusHours() method to add 5 hours to the current time, resulting in a new LocalTime instance which is printed to the console. 

Subsequently, we demonstrate the subtraction of hours by passing a negative value to plusHours(), subtracting 3 hours from the current time, and printing the resulting LocalTime to the console.

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