Java Duration toHours()

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

1. Duration toHours() Method Overview

Definition:

The Duration.toHours() method is used to obtain the number of whole hours represented by the Duration instance, disregarding any fractional hours.

Syntax:

public long toHours()

Parameters:

- None.

Key Points:

- The method returns the number of hours in the Duration, not counting any fractional part. Any excess precision information is disregarded.

- If the duration is negative, the method will return a negative value.

- This method can be particularly useful when converting a Duration to a human-readable format or when performing arithmetic operations that require whole numbers.

2. Duration toHours() Method Example

import java.time.Duration;

public class DurationToHoursExample {
    public static void main(String[] args) {
        Duration duration1 = Duration.ofMinutes(150); // 2 hours and 30 minutes
        Duration duration2 = Duration.ofMinutes(-45); // -45 minutes

        // Convert durations to hours
        long hours1 = duration1.toHours();
        long hours2 = duration2.toHours();

        // Print the hours
        System.out.println("Duration1 in hours: " + hours1);
        System.out.println("Duration2 in hours: " + hours2);
    }
}

Output:

Duration1 in hours: 2
Duration2 in hours: -1

Explanation:

In the example, duration1 is created with a duration of 150 minutes, which equates to 2 hours and 30 minutes. 

When toHours() is called on this instance, it returns 2, disregarding the additional 30 minutes. 

Similarly, duration2 is created with a negative duration of -45 minutes. When toHours() is invoked on this duration, it rounds to -1 hour, since there's no complete hour in the negative 45 minutes, and any fractional part is disregarded.

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