2020.8.31

一、今日学习内容

时钟类的实现：

题目要求：

      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。

import java.util.Scanner;
public class Time {
     private int hour;
     private int minute;
     private int second;
     public Time() {
         this.hour = 0;
        this.minute = 0;
         this.second = 0;
     }
     public Time(int hour, int minute, int second) {
         this.hour = hour;
         this.minute = minute;
         this.second = second;
     }
     public void zheng() {
         ++second;
         if (second >= 60) {
             second = 0;
             ++minute;
             if (minute >= 60) {
                 minute = 0;
                 ++hour;
                 hour %= 24;
             }
         }
     }

     public void dao() {
         second--;
         if (second < 0) {
             minute--;
             second = 59;
         }
         if (minute < 0) {
             minute = 59;
             hour--;
         }
         if (hour < 0) {
             hour = 23;
         }
     }
     public void input() {
         Scanner in = new Scanner(System.in);
         hour = in.nextInt();
         minute = in.nextInt();
         second = in.nextInt();
     }
     // 输出电子钟
     public void output() {
         System.out.println(hour + ":" + minute + ":" + second);
     }
     public boolean dengYu(Time t) {
         if (hour == t.hour && minute == t.minute && second == t.second) {
             return true;
         } else {
             return false;
         }
     }
     public static void main(String[] args) throws InterruptedException {
         int n;
         Scanner in = new Scanner(System.in);
         System.out.println("功能选择：");
         System.out.println("*********");
         System.out.println("1.钟表");
         System.out.println("2.正计时");
         System.out.println("3.倒计时");
         System.out.println("*********");
         System.out.print("请输入你的选择：");
         n = in.nextInt();
         if (n == 1) {
             System.out.print("请先校准时间：");
             Time t = new Time();
             t.input();
             while (true) {
                 t.output();t.zheng();
                 Thread.sleep(2000);
             }
         }
         if (n == 2) {
            Time t = new Time();
             while (true) {
                 t.output();
                 t.zheng();
                 Thread.sleep(2000);
             }
         }
         if (n == 3) {
             Time t1 = new Time();
             Time t2 = new Time();
             System.out.print("请输入时间：");
             t1.input();
             while (true) {
                t1.output();
                 t1.dao();
                 Thread.sleep(2000);
                if (t1.dengYu(t2)) {
                     break;
                 }
             }
             System.out.println("STOP!");
         }
     }
 }

二、遇到的问题

      无。

三、明日计划

     开学仍需努力，对java的理解还只是基础层面。