Java uses the Apache class library for time difference calculation
1. Maven coordinate dependency:
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
2. Introduction to the Apache Commons Lang class library:
Apache Commons Lang is a Java class library from the Apache Software Foundation that provides many utility classes for handling common operations such as strings, numbers, dates, files, IO, collections, and more. Among them, the 'DurationFormatUtils' class provides some methods for handling time differences.
3. Java code implementation example:
The following is a sample code for calculating time difference using the Apache Commons Lang class library:
import org.apache.commons.lang3.time.DurationFormatUtils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class TimeDifferenceExample {
public static void main(String[] args) {
String startTime = "2021-01-01 12:00:00";
String endTime = "2021-01-02 10:30:00";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
Date startDate = format.parse(startTime);
Date endDate = format.parse(endTime);
long durationMillis = endDate.getTime() - startDate.getTime();
String durationFormatted = DurationFormatUtils.formatDuration(durationMillis, "HH:mm:ss");
System.out.println("Time difference: " + durationFormatted);
} catch (ParseException e) {
e.printStackTrace();
}
}
}
In the above code, we first defined the start time and end time strings. Then use the 'SimpleDateFormat' class to convert the string into a 'Date' object. Next, calculate the millisecond difference between two 'Date' objects to obtain the number of milliseconds of the time difference, and then use the 'DurationFormatUtils' class to format the milliseconds as a time difference string in the form of' HH: mm: ss'. Finally, print out the time difference string.
4. Summary:
By using the Apache Commons Lang class library, we can easily calculate time differences and format them into specific display formats. It provides many convenient tool classes that can simplify common operations in Java applications. In the above example, we used the 'DurationFormatUtils' class to format the time difference, and the' formatDuration 'method can convert milliseconds into a specific format of the time difference string.
