*2.8（当前时间）程序清单2-7给出了显示当前格林尼治时间的程序。修改这个程序，提示用户输入相对于GMT的时区偏移量，显示在这个特定时区的时间

• 题目
• • 题目描述
  • 运行示例
  • 程序清单2-7（非本题代码）+思路（注释）
• 代码块

题目

题目描述

*2.8（当前时间）程序清单2-7给出了显示当前格林尼治时间的程序。修改这个程序，提示用户输入相对于GMT的时区偏移量，显示在这个特定时区的时间

运行示例

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

程序清单2-7（非本题代码）+思路（注释）

public class ShowCurrentTime {public static void main(String[] args) {// 2.8可以在这里获取时区// Obtain the total milliseconds since midnight, Jan 1, 1970long totalMilliseconds = System.currentTimeMillis();// Obtain the total seconds since midnight, Jan 1, 1970long totalSeconds = totalMilliseconds / 1000;//2.8可以在这里将求出的秒数+时区和GMT时区的偏移（秒数）// 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");}
}

代码块

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");}
}

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