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