2020.8.28

一、今日学习内容

1、设计一款电子钟类，用于显示时、分、秒

含有形参有默认值的默认构造函数；
前缀++ 和后缀—用于调整时间，每次调整均对秒进行调整，若秒满60，则分加1，若分满60则时加1，时满24，则清零重新开始；
设置函数用于输入（设定）时间；
设置函数用于输出时间。

  1 import java.util.Scanner;
  2 public class Time {
  3      private int hour;
  4      private int minute;
  5      private int second;
  6      public Time() {
  7          this.hour = 0;
  8         this.minute = 0;
  9          this.second = 0;
 10      }
 11      public Time(int hour, int minute, int second) {
 12          this.hour = hour;
 13          this.minute = minute;
 14          this.second = second;
 15      }
 16      public void zheng() {
 17          ++second;
 18          if (second >= 60) {
 19              second = 0;
 20              ++minute;
 21              if (minute >= 60) {
 22                  minute = 0;
 23                  ++hour;
 24                  hour %= 24;
 25              }
 26          }
 27      }
 28 
 29      public void dao() {
 30          second--;
 31          if (second < 0) {
 32              minute--;
 33              second = 59;
 34          }
 35          if (minute < 0) {
 36              minute = 59;
 37              hour--;
 38          }
 39          if (hour < 0) {
 40              hour = 23;
 41          }
 42      }
 43      public void input() {
 44          Scanner in = new Scanner(System.in);
 45          hour = in.nextInt();
 46          minute = in.nextInt();
 47          second = in.nextInt();
 48      }
 49      // 输出电子钟
 50      public void output() {
 51          System.out.println(hour + ":" + minute + ":" + second);
 52      }
 53      public boolean dengYu(Time t) {
 54          if (hour == t.hour && minute == t.minute && second == t.second) {
 55              return true;
 56          } else {
 57              return false;
 58          }
 59      }
 60      public static void main(String[] args) throws InterruptedException {
 61          int n;
 62          Scanner in = new Scanner(System.in);
 63          System.out.println("功能选择：");
 64          System.out.println("*********");
 65          System.out.println("1.钟表");
 66          System.out.println("2.正计时");
 67          System.out.println("3.倒计时");
 68          System.out.println("*********");
 69          System.out.print("请输入你的选择：");
 70          n = in.nextInt();
 71          if (n == 1) {
 72              System.out.print("请先校准时间：");
 73              Time t = new Time();
 74              t.input();
 75              while (true) {
 76                  t.output();t.zheng();
 77                  Thread.sleep(2000);
 78              }
 79          }
 80          if (n == 2) {
 81             Time t = new Time();
 82              while (true) {
 83                  t.output();
 84                  t.zheng();
 85                  Thread.sleep(2000);
 86              }
 87          }
 88          if (n == 3) {
 89              Time t1 = new Time();
 90              Time t2 = new Time();
 91              System.out.print("请输入时间：");
 92              t1.input();
 93              while (true) {
 94                 t1.output();
 95                  t1.dao();
 96                  Thread.sleep(2000);
 97                 if (t1.dengYu(t2)) {
 98                      break;
 99                  }
100              }
101              System.out.println("STOP!");
102          }
103      }
104  }

二、遇到的问题
对一些函数得使用方法不理解
三、明日计划
继续完成一些例题