What is the method in Java for obtaining the time diffe…

In Java, you can use classes like java.util.Date, java.util.Calendar, and java.time.Duration to calculate time differences.

1. The Date class from the java.util package

Date startTime = new Date(); // 开始时间
// 执行一些操作
Date endTime = new Date(); // 结束时间

long timeDifference = endTime.getTime() - startTime.getTime(); // 时间差（毫秒）

1. The Java Calendar class

Calendar startTime = Calendar.getInstance(); // 开始时间
// 执行一些操作
Calendar endTime = Calendar.getInstance(); // 结束时间

long timeDifference = endTime.getTimeInMillis() - startTime.getTimeInMillis(); // 时间差（毫秒）

1. the duration in Java code

LocalDateTime startTime = LocalDateTime.now(); // 开始时间
// 执行一些操作
LocalDateTime endTime = LocalDateTime.now(); // 结束时间

Duration duration = Duration.between(startTime, endTime); // 时间差
long timeDifference = duration.toMillis(); // 时间差（毫秒）

Please note that the time differences in the above methods are all in milliseconds and may need to be converted to a different unit based on your needs.