src/chapter5/Example23.java

@@ -1,19 +1,4 @@
 package chapter5;
 
-import java.time.LocalDateTime;
-import java.time.format.DateTimeFormatter;
-
 public class Example23 {
-    public static void main(String[] args) {
-        // 1. 获取当前时间
-        LocalDateTime now = LocalDateTime.now();
-        System.out.println("原格式：" + now);
-        System.out.println("只有日期：" + now.toLocalDate());
-        System.out.println("只有时间：" + now.toLocalTime());
-        // 2. getter 方法
-        System.out.println(now.getYear() +"年" + now.getMonthValue() + "月" + now.getDayOfMonth() + "号 "
-            + now.getHour() + "点" + now.getMinute() + "分" + now.getSecond() + "秒");
-        // 3. 指定格式
-        System.out.println("指定格式：" + now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
-    }
 }

src/chapter5/Example24.java

@@ -1,20 +0,0 @@
-package chapter5;
-
-import java.time.Duration;
-import java.time.LocalTime;
-
-public class Example24 {
-    public static void main(String[] args) {
-        LocalTime start = LocalTime.now();
-        LocalTime end = LocalTime.of(21, 53, 0);
-
-        Duration duration = Duration.between(start, end);
-
-        System.out.println("时间间隔（纳秒）" + duration.toNanos());
-        System.out.println("时间间隔（毫秒）" + duration.toMillis());
-        System.out.println("时间间隔（秒）" + duration.toSeconds());
-        System.out.println("时间间隔（分钟）" + duration.toMinutes());
-        System.out.println("时间间隔（小时）" + duration.toHours());
-
-    }
-}

src/chapter5/Example25.java

@@ -1,16 +0,0 @@
-package chapter5;
-
-import java.time.LocalDate;
-import java.time.Period;
-
-public class Example25 {
-    public static void main(String[] args) {
-        LocalDate birthday = LocalDate.of(2018, 12, 12);
-        LocalDate now = LocalDate.of(2020, 11, 13);
-
-        Period period = Period.between(birthday, now);
-        System.out.println("时间间隔（年）" + period.getYears());
-        System.out.println("时间间隔（月）" + period.getMonths());
-        System.out.println("时间间隔（天）" + period.getDays());
-    }
-}

src/chapter5/demo55.java

@@ -1,43 +0,0 @@
-package chapter5;
-
-import java.time.LocalDate;
-import java.util.Scanner;
-
-public class demo55 {
-    public static void main(String[] args) {
-        Scanner scn = new Scanner(System.in);
-        System.out.println("请输入要判断的年份：");
-        int year = scn.nextInt();
-
-        System.out.println("方法一：" + year + "的2月有" + getNumOfDaysInFeb1(year) + "天");
-        System.out.println("方法二：" + year + "的2月有" + getNumOfDaysInFeb2(year) + "天");
-    }
-
-    /**
-     * 思路一
-     * @param year 年份
-     * @return 2月的天数
-     */
-    public static int getNumOfDaysInFeb1(int year) {
-        LocalDate date = LocalDate.of(year, 3, 1);
-        LocalDate feb = date.minusDays(1);
-        return feb.getDayOfMonth();
-    }
-
-    /**
-     * 思路二
-     * @param year 年份
-     * @return 2月的天数
-     */
-    public static int getNumOfDaysInFeb2(int year) {
-        LocalDate date = LocalDate.of(year, 1, 1);
-        if (date.isLeapYear()) {
-            return 29;
-        } else {
-            return 28;
-        }
-
-        // return date.isLeapYear() ? 29 : 28;
-    }
-
-}