java 获取当前时间 short year ; byte mouth; byte day; byte hour; byte minute; byte second; short millisecond;

可以使用 Java 的 `java.time` 包中的 `LocalDateTime` 类来获取当前时间，并从中提取所需的年、月、日、小时、分钟、秒和毫秒。

以下是获取当前时间并提取所需信息的示例代码：

import java.time.LocalDateTime;

public class Main {
    public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();
        short year = (short) now.getYear();
        byte month = (byte) now.getMonthValue();
        byte day = (byte) now.getDayOfMonth();
        byte hour = (byte) now.getHour();
        byte minute = (byte) now.getMinute();
        byte second = (byte) now.getSecond();
        short millisecond = (short) now.getNano() / 1_000_000; // Convert nanoseconds to milliseconds
        
        System.out.printf("Current time: %d-%02d-%02d %02d:%02d:%02d.%03d",
                year, month, day, hour, minute, second, millisecond);
    }
}

输出示例：

Current time: 2022-12-31 23:59:59.999