TreeDFS/src/main/java/Test.java
2021-12-29 16:52:29 +08:00

72 lines
2.6 KiB
Java

import java.math.BigDecimal;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.util.ArrayList;
import java.util.List;
/**
* todo Created with IntelliJ IDEA
*
* @author luming
* @email: lu.lm@bitsun-inc.com
* @date 2021/12/14 15:15
*/
public class Test {
public static void main(String[] args) {
LocalDate now = LocalDate.now().plusMonths(-1);
System.out.println("现在时间="+ now);
String format1 = DateTimeFormatter.ofPattern("yyyy-MM").format(now);
System.out.println("上个月="+format1);
LocalDate month = LocalDate.now().plusMonths(-1);
String lastMonth = DateTimeFormatter.ofPattern("yyyy-MM").format(month);
System.out.println("上个月="+lastMonth);
LocalDate date = parseString2Date("2021-12");
LocalDate firstDay = date.with(TemporalAdjusters.firstDayOfMonth());
LocalDate lastDay = date.with(TemporalAdjusters.lastDayOfMonth());
System.out.println(date);
System.out.println(firstDay);
System.out.println(lastDay);
LocalDateTime localDateTime = firstDay.atStartOfDay();
System.out.println(localDateTime);
LocalDateTime localDateTime1 = lastDay.plusDays(1).atStartOfDay();
System.out.println(localDateTime1);
BigDecimal bigDecimal = new BigDecimal(0);
System.out.println(bigDecimal);
bigDecimal.add(BigDecimal.TEN);
bigDecimal.add(BigDecimal.ONE);
System.out.println(bigDecimal.add(BigDecimal.TEN).add(BigDecimal.ONE));
System.out.println(firstDay.until(lastDay, ChronoUnit.DAYS) + 1);
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM");
String format = dateTimeFormatter.format(lastDay);
System.out.println(format);
List<StringBuilder> noticeList = new ArrayList<>();
noticeList.add(new StringBuilder("123"));
noticeList.add(new StringBuilder("123"));
noticeList.add(new StringBuilder("123"));
noticeList.add(new StringBuilder("123"));
System.out.println(noticeList);
System.out.println(StringUtils);
}
private static LocalDate parseString2Date(String timeStr) {
DateTimeFormatter DATEFORMATTER = new DateTimeFormatterBuilder().append(DateTimeFormatter.ofPattern("yyyy-MM"))
.parseDefaulting(ChronoField.DAY_OF_MONTH, 1)
.toFormatter();
return LocalDate.parse(timeStr, DATEFORMATTER);
}
}