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第六章第二十五题（将毫秒数转换成小时数、分钟数和秒数）(Convert milliseconds to hours, minutes, and seconds)

• **6.25（将毫秒数转换成小时数、分钟数和秒数）使用下面的方法头，编写一个将毫秒数转换成小时数、分钟数和秒数的方法。
  
  public static String convertMillis(long millis)
  
  该方法返回形如“小时：分钟：秒”的字符串。例如：convertMillis(5500)返回字符串0：0：5，convertMillis(100000)返回字符串0：1：40，convertMillis(555550000)返回字符串154：19：10。编写一个测试程序，提示用户输入一个long型的毫秒数，以“小时：分钟：秒”的格式显示一个字符串。
  
  **6.25(Convert milliseconds to hours, minutes, and seconds)Write a method that converts milliseconds to hours, minutes, and seconds using the following header:
  
  public static String convertMillis(long millis)
  
  The method returns a string as hours:minutes:seconds. For example, convertMillis(5500) returns a string 0:0:5, convertMillis(100000)returns a string 0:1:40, and convertMillis(555550000) returns a string 154:19:10. Write a test program that prompts the user to enter a long integer for milliseconds and displays a string in the format of hours:minutes:seconds.
• 参考代码：

package chapter06;

import java.util.Scanner;

public class Code_25 {
    public static void main(String[] args) {
        Scanner inputScanner = new Scanner(System.in);
        System.out.print("enter a long integer for milliseconds: ");
        long millis = inputScanner.nextLong();
        System.out.printf("The time is %s", convertMillis(millis));
    }
    public static String convertMillis(long millis) {
        String timeString = "";
        long totalSeconds = millis / 1000;
        long currentSecond = totalSeconds % 60;
        long totalMinutes = totalSeconds / 60;
        long currentMinute = totalMinutes % 60;
        long totalHours = totalMinutes / 60;
        timeString = String.valueOf(totalHours) + ":" + String.valueOf(currentMinute) + ":" + String.valueOf(currentSecond);
        return timeString;
    }
}

• 结果显示：

enter a long integer for milliseconds: 555550000
The time is 154:19:10
Process finished with exit code 0