java比较两个时间大小

可以使用Java中的Date类或者LocalDateTime类来比较两个时间的大小。具体实现可以使用compareTo()方法或isAfter()/isBefore()方法。以下是一个示例代码：

import java.time.LocalDateTime;

public class CompareTime {
    public static void main(String[] args) {
        LocalDateTime time1 = LocalDateTime.of(2021, 5, 1, 10, 30);
        LocalDateTime time2 = LocalDateTime.of(2021, 5, 2, 9, 0);

        int result = time1.compareTo(time2);

        if (result < 0) {
            System.out.println("time1 is earlier than time2");
        } else if (result > 0) {
            System.out.println("time1 is later than time2");
        } else {
            System.out.println("time1 and time2 are equal");
        }
    }
}

输出结果为："time1 is earlier than time2"。