*3.30（當前時間）修改編程練習題2.8，以12小時時鐘制顯示小時數

• 題目
• • 題目概述
  • 運行示例
  • 編程練習題2.8
  • 破題
• 代碼

題目

題目概述

*3.30（當前時間）修改編程練習題2.8，以12小時時鐘制顯示小時數

運行示例

Enter the time zone offset to GMT: -5
The current time is 4:50:34 AM

編程練習題2.8

歡迎點擊這里前往我的2.8博文，或復制url到瀏覽器：

https://blog.csdn.net/weixin_46356698/article/details/119783225

import java.util.Scanner;public class Test2_8 {public static void main(String[] args) {Scanner input = new Scanner(System.in);System.out.println("Enter the time zone offset to GMT:");int offset = input.nextInt();// Obtain the total milliseconds since midnight, Jan 1, 1970long totalMilliseconds = System.currentTimeMillis();// Obtain the total seconds since midnight, Jan 1, 1970long totalSeconds = totalMilliseconds / 1000;totalSeconds += offset * 60 * 60;// Compute the current second in the minute in the hourlong currentSecond = totalSeconds % 60;// Obtain the total minuteslong totalMinutes = totalSeconds / 60;// Compute the current minute in the hourlong currentMinute = totalMinutes % 60;// Obtain the total hourslong totalHours = totalMinutes / 60;// Compute the current hourlong currentHour = totalHours % 24;// Display resultsSystem.out.println("Current time is " + currentHour + ":"+ currentMinute + ":" + currentSecond + " GMT");} }

破題

在理解2.8題目的基礎上只需要更改一小部分即可
我的理解，是在最后輸出前增加對小時的變換
對12求余即可獲取3.30要求的小時數
原數除12如果為0后面跟AM，如果為1后面跟PM

代碼

import java.util.Scanner;public class Test2_8 {public static void main(String[] args) {Scanner input = new Scanner(System.in);System.out.println("Enter the time zone offset to GMT:");int offset = input.nextInt();// Obtain the total milliseconds since midnight, Jan 1, 1970long totalMilliseconds = System.currentTimeMillis();// Obtain the total seconds since midnight, Jan 1, 1970long totalSeconds = totalMilliseconds / 1000;totalSeconds += offset * 60 * 60;// Compute the current second in the minute in the hourlong currentSecond = totalSeconds % 60;// Obtain the total minuteslong totalMinutes = totalSeconds / 60;// Compute the current minute in the hourlong currentMinute = totalMinutes % 60;// Obtain the total hourslong totalHours = totalMinutes / 60;// Compute the current hourlong currentHour = totalHours % 24;long currentHour_12 = currentHour % 12;// Display resultsif(currentHour / 12 == 0)System.out.println("Current time is " + currentHour_12 + ":"+ currentMinute + ":" + currentSecond + " AM");elseSystem.out.println("Current time is " + currentHour_12 + ":"+ currentMinute + ":" + currentSecond + " PM");} }

總結

以上是生活随笔為你收集整理的Java黑皮书课后题第3章：*3.30（当前时间）修改编程练习题2.8，以12小时时钟制显示小时数的全部內容，希望文章能夠幫你解決所遇到的問題。

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